New Geology Articles Published Online Ahead of Print in May
Boulder, Colo., USA: Article topics and locations include the Southern
Rocky Mountain volcanic field; a tropically hot mid-Cretaceous North
American Western Interior Seaway; a newly discovered subglacial lake in
East Antarctica; 830-million-year-old microorganisms in primary fluid
inclusions in halite; horseshoe crab–like mating in trilobites; mayflies in
the Jurassic; and an explosive volcanic origin identified for dark sand in
Aeolis Dorsa, Mars. These Geology articles are online at
https://geology.geoscienceworld.org/content/early/recent
.
Protogenetic clinopyroxene inclusions in diamond and Nd diffusion
modeling—Implications for diamond dating
L. Pasqualetto; F. Nestola; D.E. Jacob; M.G. Pamato; B. Oliveira ...
Abstract:
Diamonds are witnesses of processes that have operated in Earth’s mantle
over more than 3 b.y. Essential to our understanding of these processes is
the determination of diamond crystallization ages. These cannot be directly
determined on diamond, but they can be calculated using radiogenic isotopic
systematics of suitable minerals included in a diamond. This method relies
on the assumption that the mineral inclusions were in isotopic equilibrium
with the diamond-forming medium. We evaluated the validity of Sm-Nd ages
yielded by clinopyroxene inclusions by combining crystallographic
orientation analyses and Nd diffusion modeling at the relevant conditions
for Earth’s cratonic mantle. We investigated the crystallographic
orientation relationships (CORs) for 54 clinopyroxene inclusions within 18
diamonds from South Africa and Siberia. Clinopyroxene inclusions in some
diamonds showed specific CORs with their hosts, indicating possible
syngenesis. Other samples had clusters of clinopyroxene inclusions sharing
the same orientation but no specific orientation relative to their hosts,
indicating that the inclusions are older than the diamond (i.e., they are
protogenetic). Diffusion modeling in the temperature range typical for
lithospheric diamonds (900–1400 °C) showed that resetting of the Sm-Nd
isotopic system in clinopyroxene grains larger than 0.05 mm requires
geologically long interaction with the diamond-forming fluid/melt (>3.5
m.y. at average temperature of ~1150 °C). Depending on inclusion size and
temperature regime, protogenetic clinopyroxene inclusions may not fully
reequilibrate during diamond-formation events. We suggest that small
clinopyroxene inclusions (<0.2 mm) that equilibrated at temperatures
higher than 1050–1080 °C may be the most suitable for age determinations.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50273.1/614054/Protogenetic-clinopyroxene-inclusions-in-diamond
The role of flat slab subduction, ridge subduction, and tectonic
inheritance in Andean deformation
Brian K. Horton; Tomas N. Capaldi; Nicholas D. Perez
Abstract:
Convergent plate boundaries show sharp variations in orogenic width and
extent of intraplate deformation. Analysis of late Cenozoic contractile
deformation along the Andean mountain front and adjacent foreland
highlights the contrasting degrees of deformation advance toward the plate
interior. The retroarc positions of the Andean topographic front (marked by
frontal thrust-belt structures) and foreland deformation front (defined by
isolated basement block uplifts) range from 300 to 900 km inboard of the
trench axis. Over the ~8000 km arcuate length of the Andes (10°N to 55°S),
four discrete maxima of inboard deformation advance are spatially
co-located with the Peruvian (5°S–14°S) and Pampean (27°S–33°S) zones of
flat slab subduction, the subducted Chile Ridge (45°S–48°S), and the
anomalously thick Paleozoic stratigraphic wedge of Bolivia (17°S–23°S). The
spatial correspondence of retroarc shortening with specific geodynamic
configurations demonstrates the mechanical role of flat slab subduction,
slab window development, and combined structural and stratigraphic
geometries in shaping the orogenic architecture of Cordilleran margins,
largely through lithospheric strengthening, weakening, and/or tectonic
inheritance.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50094.1/614055/The-role-of-flat-slab-subduction-ridge-subduction
Triple oxygen isotope evidence for a hot Archean ocean
J.P. McGunnigle; E.J. Cano; Z.D. Sharp; K. Muehlenbachs; D. Cole ...
Abstract:
Triple oxygen isotope (δ17O and δ18O) values of high-
and low-temperature altered oceanic crust and products of basalt alteration
experiments were measured to better constrain ocean isotope compositions in
deep time. The data define an array of δ18O and Δ′17O
(Δ′17O=δ′17O – λRL × δ′18O + γ)
values from mantle values toward 1‰ and –0.01‰, respectively, with a λ of
~0.523. The altered oceanic crust data were used to construct a model for
estimating δ18O-Δ′17O values of the ancient oceans if
the continental weathering flux (FCW) and/or hydrothermal oceanic crust
alteration flux (FHT) changed through time. A maximum lowering of 7‰ and
4‰, respectively, is achieved in the most extreme cases. The δ18
O value of the ocean cannot be raised by more than 1.1‰. Eclogites from the
Roberts Victor kimberlite (South Africa), with a protolith age of 3.1 Ga,
have δ18O-Δ′17O values that precisely overlap with
those of the modern altered oceanic crust, suggesting that the Archean
oceans had similar isotope values as today. Published triple isotope data
for Archean cherts show that all samples have been altered to some degree
and suggest an Archean ocean surface temperature of ~70–100 °C. An ocean as
light as –2‰ is still consistent with our eclogite data and reduce our
temperature estimates by 10 °C.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50230.1/614056/Triple-oxygen-isotope-evidence-for-a-hot-Archean
Zircon-modeled melts shed light on the formation of Earth’s crust from
the Hadean to the Archean
T.L. Carley; E.A. Bell; C.F. Miller; L.L. Claiborne; A. Hunt ...
Abstract:
Elucidating the compositions of melts from which Hadean zircons
crystallized can provide insight into early crust construction. We
calculated model melts using Ti-calibrated zircon/melt partition
coefficients and trace element data for zircons from the Hadean, Archean,
and possible analogue environments (e.g., rifts, hotspots, arcs) to
constrain petrogenetic relationships. Model melts from oceanic settings
(mid-ocean ridges, arcs, Iceland) showed higher heavy rare earth element
(HREE) contents and shallower middle REE (MREE) to HREE/chondrite (ch)
slopes than those from continental arcs and
tonalite-trondhjemite-granodiorite suites (TTGs). However, Hadean and
Archean model melts were consistently similar to each other and to those
from continental arcs, hotspots, and TTGs (and dissimilar to oceanic
settings), with depleted HREE contents and slope reversal in heaviest REE ch. Despite close similarities that suggest comparable
petrogenesis of Hadean and early Archean magmas from which Jack Hills
detrital zircons crystallized, subtle variabilities in REEch and
Zr/Hf suggest thickening crust and evolving igneous systems through time.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50017.1/614057/Zircon-modeled-melts-shed-light-on-the-formation
Deep-focus earthquakes: From high-temperature experiments to cold slabs
Julien Gasc; Clémence Daigre; Arefeh Moarefvand; Damien Deldicque; Julien
Fauconnier ...
Abstract:
Deep-focus earthquakes (DFEs) present an interesting scientific challenge
in that they occur at depths where brittle failure should be impossible.
The fact that their occurrence is confined to locations where subducting
lithospheric slabs are crossing through the transition zone suggests that
olivine phase transformations may be involved in the production of these
earthquakes. Experimental studies have shown that olivine can persist
metastably in subducting slabs and that olivine phase transformations can
lead to faulting at high pressures. However, it has been argued that large
DFEs are too large to be contained within a metastable olivine wedge
preserved in the interior of subducting slabs. We demonstrate, using
experiments on olivine-analog materials, that transformational faulting can
continue to propagate via shear-enhanced melting into the stable
high-pressure phase. We also show that transformational faulting is
controlled by the ratio between strain rates and the olivine-ringwoodite
transformation rates, and extrapolate this relationship to the natural
conditions of DFEs. Counterintuitively, these results imply that cold and
fast-subducting slabs produce transformational faulting at higher
temperatures, which results in more numerous DFEs.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50084.1/614058/Deep-focus-earthquakes-From-high-temperature
Neodymium isotopes of central Mediterranean phosphatic hardgrounds
reveal Miocene paleoceanography
Irene Cornacchia; Marco Brandano; Samuele Agostini; Axel Munnecke
Abstract:
Understanding the causes of the formation of hardgrounds provides insights
on the oceanographic evolution of a basin. Phosphate-rich hardground
formation interrupted carbonate ramp deposition in the Mediterranean during
the Miocene. We analyzed the εNd record of three central
Mediterranean hardgrounds to identify the origin of the phosphate-rich
waters that formed them within the frame of Mediterranean Miocene
paleoceanographic evolution. The Nd isotopes suggest that eastern
Mediterranean deep waters were controlled by runoff, in contrast to
Atlantic and Indian Ocean waters. This Nd isotope record attests to the
weakening of Mediterranean circulation during the Miocene due to closure of
the Indian Gateway. Limited exchange with Atlantic shallow seawater led to
long residence times for deep waters in the basin. This record indicates
the role of upwelling in formation of phosphate hardgrounds and shows the
influence of global climate change and local paleoceanographic conditions.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50118.1/614059/Neodymium-isotopes-of-central-Mediterranean
Mercury isotopic composition of igneous rocks from an accretionary
orogen: Implications for lithospheric recycling
Changzhou Deng; Jun Gou; Deyou Sun; Guangyi Sun; Zhendong Tian ...
Abstract:
Mercury (Hg) provides critical information on terrestrial planet formation
and evolution due to its unique physicochemical properties and multiform
isotopic compositions. Current knowledge of Hg is mainly limited to Earth’s
surface environments, and the understanding of Hg in the Earth’s interior
remains unclear. Accretionary orogens are major settings for continental
crustal growth and crust-mantle interactions. We studied the Hg
concentration and isotopic composition of igneous rocks in the eastern
Central Asian orogenic belt, using Hg as a proxy to trace the recycling of
surface materials in Earth’s lithosphere. Our results show low Hg
abundances in mafic through felsic igneous rocks (4.93 ± 4.35 ppb, standard
deviation [SD], n = 267). Mafic rocks show slightly lower δ 202Hg (–2.9‰ ± 0.5‰, SD, n = 24) than intermediate
(–2.4‰ ± 0.8‰, SD, n = 58) and felsic (–1.5‰ ± 0.8‰, SD, n = 185) rocks, indicating a chemical stratification of Hg
isotopic composition in the continental crust with isotopically lighter Hg
in the lower part and heavier Hg in the upper part. Slightly positive Δ 199Hg values are observed in mantle-derived mafic (0.07‰ ±
0.06‰, SD) and intermediate (0.06‰ ± 0.07‰, SD) rocks, which agree well
with those reported for marine sediments, indicating the involvement of
fluids or melts from the oceanic crust. Larger variations of Δ199Hg values (–0.26‰ to +0.21‰, average: 0.01‰ ± 0.08‰, SD, n = 185) are observed in felsic rocks, further indicating
recycling of surface Hg from the marine reservoir via slab subduction
(reflected by positive values) plus magmatic assimilation of terrestrial Hg
(reflected by negative values). Our study demonstrates that Hg isotopes can
be a promising tracer for the chemical dynamics of Earth’s lithosphere.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50131.1/614060/Mercury-isotopic-composition-of-igneous-rocks-from
Gouge fabrics reset by thermal pressurization record stress on faults
after earthquakes
Li-Wei Kuo; Hiroki Sone; Vladimir Luzin; En-Chao Yeh; Ya-Ju Hsu ...
Abstract:
Stress on seismogenic faults provides critical information about how much
elastic energy is stored in the crust and released by earthquakes, which is
crucial in understanding earthquake energetics and recurrence. However,
determining post-earthquake stress states on faults remains challenging
because current borehole methods are rarely applicable to damaged fault
zone rocks. We applied neutron texture analysis to gouge samples of the
1999 Chi-Chi earthquake in Taiwan to infer the stress state after the
earthquake. Results indicate that the clay fabric within the principal slip
zone is orthogonal to the fault plane, whereas outside the principal slip
zone the fabric is predominantly parallel to the bedding-parallel fault
plane. We suggest that the clay fabric in the slip zone was first
neutralized by the coseismic fluidization caused by thermal pressurization
and later re-oriented to the new direction of post-earthquake principal
stress. Such stress orientation is consistent with the orientations
inferred from core-scale fault slip data and dislocation models constrained
from global navigation satellite system displacements. If thermal
pressurization is a ubiquitous process during earthquakes, gouge fabrics
can be used to help probe the post-earthquake stress state of faults.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50217.1/614061/Gouge-fabrics-reset-by-thermal-pressurization
Mayflies as resource pulses in Jurassic lacustrine ecosystems
Qianqi Zhang; Bo Wang; Daran Zheng; Jiahao Li; Xueheng Wang ...
Abstract:
Resource pulses, occasional events of ephemeral resource superabundance,
represent a fundamental mechanism by which energy, nutrients, and biomass
are transported across ecotones. They are widespread in extant ecosystems;
however, little is known about their deep-time record. We report the
earliest-known mayfly swarm from the Early Jurassic Xiwan biota of southern
China. Our taphonomic and sedimentological analyses show that these
mayflies were buried on the bottom of a calm lake after post-mating death.
Our suite of analyses suggests that the complex mating-swarm behavior was
already well established in mayflies by the Early Jurassic. More
importantly, our find represents the earliest-known resource pulse of
insects, a mechanism that can play a substantial role in nutrient transport
from aquatic ecosystems to surrounding terrestrial ecosystems. Such an
aquatic-terrestrial ecosystem linkage may be a key novelty in Mesozoic
lacustrine ecosystems. Our results highlight the underappreciated
ecological significance of insects in deep-time terrestrial ecology.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50055.1/614062/Mayflies-as-resource-pulses-in-Jurassic-lacustrine
Explosive-effusive-explosive: The role of magma ascent rates and paths
in modulating caldera eruptions
Olivier Bernard; Weiran Li; Fidel Costa; Steve Saunders; Ima Itikarai ...
Abstract:
One of the biggest challenges in volcanology is assessing the role of magma
properties (volatile budgets, storage depths, and ascent rates) in
controlling eruption explosivity. We use a new approach based on apatite to
estimate volatile contents and magma ascent rates from a sequence of
sub-Plinian, effusive, and Vulcanian eruption deposits at Rabaul caldera
(Papua New Guinea) emplaced in 2006 CE to probe the mechanisms responsible
for the sudden transitions in eruption styles. Our findings show that all
magmas were originally stored at similar conditions (2–4 km depth and
1.8–2.5 wt% H2O in the melt); only the magma that formed the
lava flow stalled and degassed at a shallower level (0.2–1.5 km) for
several months. A more energetic batch of magma rose from depth, bypassed
the transient reservoir, and ascended within ≤8 h to Earth’s surface (mean
velocity ≥0.2 m/s), yielding the initial sub-Plinian phase of the eruption.
The shallowly degassed magma was then able to reach the surface as a lava
flow, likely through the path opened by the sub-Plinian magma. The magma of
the last Vulcanian phase ascended without storage at a shallow depth,
albeit more slowly (ascent rate 0.03–0.1 m/s) than the sub-Plinian magma.
Our study illustrates how the complexity of plumbing systems may affect
eruption styles, including at other volcanic systems, and have implications
for interpreting volcano monitoring data.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50023.1/614063/Explosive-effusive-explosive-The-role-of-magma
Ringwoodite and zirconia inclusions indicate downward travel of
super-deep diamonds
Sofia Lorenzon; Davide Novella; Paolo Nimis; Steven D. Jacobsen; Emilie
Thomassot ...
Abstract:
Natural diamonds and their inclusions provide unique glimpses of mantle
processes from as deep as ~800 km and dating back to 3.5 G.y. Once formed,
diamonds are commonly interpreted to travel upward, either slowly within
mantle upwellings or rapidly within explosive, carbonate-rich magmas
erupting at the surface. Although global tectonics induce subduction of
material from shallow depths into the deep mantle, mineralogical evidence
for downward movements of diamonds has never been reported. We report the
finding of an unusual composite inclusion consisting of ringwoodite (the
second finding to date), tetragonal zirconia, and coesite within an
alluvial super-deep diamond from the Central African Republic. We interpret
zirconia + coesite and ringwoodite as prograde transformation products
after zircon or reidite (ZrSiO4) and olivine or wadsleyite,
respectively. This inclusion assemblage can be explained if the diamond
traveled downward after entrapping olivine/wadsleyite + zircon/reidite,
dragged down by a subducting slab, before being delivered to the surface.
This indicates that the commonly assumed view that diamonds form at, and
capture material from, a specific mantle level and then travel upward is
probably too simplistic.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50111.1/614064/Ringwoodite-and-zirconia-inclusions-indicate
U-Pb dating reveals multiple Paleoproterozoic orogenic events
(Hamersley orogenic cycle) along the southern Pilbara margin
(Australia) spanning the onset of atmospheric oxygenation
Birger Rasmussen; Jian-wei Zi; Janet Muhling
Abstract:
The early Paleoproterozoic was a time of unprecedented change in Earth’s
climate and surface environment. The key to resolving some of the
controversies surrounding the timing and causes of these changes lies with
supracrustal sequences, such as the 2.45–2.22 Ga Turee Creek Group in the
southern Pilbara craton, northwestern Australia. The group preserves a
predominantly siliciclastic sequence; however, its precise age, tectonic
setting, and postdepositional history are disputed. Although it is
interpreted to have been deposited in a foreland basin setting shortly
after 2.45 Ga, the oldest well-recognized deformational event, marked by
northward folding and thrusting, is the 2.20–2.15 Ga Ophthalmia orogeny.
Evidence for a pre-Ophthalmia fabric-forming tectonic event north of the
Archean Sylvania Inlier, southeast Pilbara craton, which is marked by tight
to isoclinal folding, has been largely overlooked. In this area, we report
in situ U-Pb geochronology of authigenic monazite and xenotime in shale
with a well-developed tectonic cleavage from the ca. 2.63 Ga Jeerinah
Formation. Monazite porphyroblasts, which are locally wrapped by strain
fringes aligned in a tectonic cleavage, yielded weighted mean 207Pb/206Pb ages at 2370 ± 11 Ma and 2312 ± 8 Ma,
whereas xenotime, which overprints a crenulation cleavage, gave a weighted
mean 207Pb/206Pb age of 2291 ± 11 Ma, constraining
fabric development to between 2.31 Ga and 2.29 Ga. Our results confirm the
existence of a pre-Ophthalmia deformational event in the southeastern
Pilbara craton, herein referred to as the Sylvania orogeny, which is part
of an ~300 m.y. interval (2.45–2.15 Ga) of northward-directed compression
(“Hamersley orogenic cycle”). This orogenic cycle is marked by east-west
and northwest-southeast folding, cleavage development, veining,
hydrothermal gold mineralization, and isotopic resetting across the
southern Pilbara craton. Our results indicate that the syn–Great Oxidation
Event Turee Creek Group was deposited in one or more foreland basins after
2.45 Ga. Our results provide a new tectonostratigraphic and geodynamic
framework for understanding the timing and origin of geochemical records in
a key succession deposited during an interval of global environmental
change.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50010.1/613624/U-Pb-dating-reveals-multiple-Paleoproterozoic
Permeability of subducted oceanic crust revealed by eclogite-facies
vugs
Samuel Angiboust; Tom Raimondo
Abstract:
We report the finding of rare eclogite-facies vugs forming millimeter- to
centimeter-sized pockets in meta-ophiolites from the western European Alps.
Euhedral garnet crystals covering the vug walls display oscillatory
chemical zoning for a wide range of major and trace elements, including Cr,
Mn, and rare earth elements. Thermodynamic modeling revealed that
closed-system fluid production through the breakdown of prograde
glaucophane, lawsonite, and chlorite between 505 °C and 525 °C can
successfully explain porosity creation of ~4% and the mineralogical
properties of the vugs. Available geologic and geochronologic constraints
indicate that the eclogitization of the downgoing mafic crust spanned a
window of at least 1 m.y. These observations can only be explained by the
presence of extremely low permeability values (<10–22 m 2) to keep the fluid confined at the meter scale within vugs on
such time scales. Our field-based report of eclogite porosity provides the
first in situ confirmation of previous experimental data and
geophysical estimates on active margins. A substantial amount of fluid
trapped in this porosity may be carried deeper than expected into Earth’s
mantle, with implications for volatile recycling budgets.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50066.1/613625/Permeability-of-subducted-oceanic-crust-revealed
Recurrent tectonic activity in northeastern Brazil during Pangea
breakup: Constraints from U-Pb carbonate dating
Carlos E. Ganade; Caue R. Cioffi; João Pacífico Machado; Tiago Miranda;
Leonardo B. Lopes ...
Abstract:
Carbonate U-Pb dating of samples from rift-bounding faults of
intracontinental basins in the Borborema province, northeastern Brazil,
indicate recurrent tectonic activity during Pangea breakup lasting for
>150 m.y. from the Late Triassic to the Paleocene, reactivating
inherited strike-slip Neoproterozoic–Cambrian shear zones. Triassic ages
indicate that brittle deformation started some 80 m.y. before previously
known, most likely related to rifting along the incipient Central Atlantic.
The subsequent Cretaceous opening of the South Atlantic caused renewed
fault activity during rifting and basin development. Furthermore, recurrent
Cenozoic tectonic activity along the rift-bounding faults is indicated,
suggesting that structural inheritance of the Neoproterozoic–Cambrian
continental-scale Borborema shear zone system has been responsible for
accommodation of recurrent tectonic stress from Mesozoic rifting to the
present day.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50032.1/613626/Recurrent-tectonic-activity-in-northeastern-Brazil
Seismic evidence for lithospheric boudinage and its implications for
continental rifting
Luan C. Nguyen; Alan Levander; Fenglin Niu; Julia Morgan; Guoliang Li
Abstract:
The continental rifting that precedes the breakup of a continent and the
formation of a new ocean basin is one of the key processes of plate
tectonics. Although often viewed as a two-dimensional process, rifted
margins exhibit significant variations along strike. We document
along-strike variations developed during the ca. 200–160 Ma continental
rifting that formed the margins of the Gulf of Mexico ocean basin.
Rayleigh-wave ambient noise tomography reveals a zone of high and low
seismic velocity resembling large-scale geologic boudins in the mantle
lithosphere of the northwestern Gulf of Mexico margin. These features
become progressively less prominent eastward following the transition from
a magma-poor to a magma-rich passive margin. We infer that mantle
refertilization and thickness of the pre-rift lithosphere control
deformation style and the along-strike variations in continental rifting.
Our results also suggest that deformation during rifting produces
long-lived features that persist long after breakup and, therefore, can be
used to study rifted margins globally.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50046.1/613627/Seismic-evidence-for-lithospheric-boudinage-and
Accumulation of windblown sand in impact craters on Mars
Andrew Gunn; Lior Rubanenko; Mathieu G.A. Lapôtre
Abstract:
Loose sand, blown away from source regions by winds, is transported across
Mars’s surface into sand sheets and dunes and accumulates within
topographic sinks. In the absence of plate tectonics, impact craters
constitute a dominant sink for windblown sediments on Mars today. We
analyzed the volume of all mapped eolian sands in martian craters >1 km
in diameter to reveal spatiotemporal patterns of sediment accumulation on
the planet’s surface. We combined our results with global climate
simulations, maps of depth to the ice table and dust cover, as well as
lithologic and age information of the underlying geologic units, to better
understand the controls on intracrater sand accumulation rates. We find
that crater age, latitude, and lithology influence the accumulation rate of
windblown sand and, notably, that it is enhanced in mechanically weaker
substrates, high-latitude craters (suggesting that modern cryogenic
processes may enhance sand production), and in Late Noachian and Early
Hesperian craters (possibly hinting at increased erosion rates at that
time).
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49936.1/613628/Accumulation-of-windblown-sand-in-impact-craters
Multiple phyla, one time resolution? Similar time averaging in benthic
foraminifera, mollusk, echinoid, crustacean, and otolith fossil
assemblages
Rafał Nawrot; Michaela Berensmeier; Ivo Gallmetzer; Alexandra Haselmair;
Adam Tomašových ...
Abstract:
Time averaging of fossil assemblages determines temporal precision of
paleoecological and geochronological inferences. Taxonomic differences in
intrinsic skeletal durability are expected to produce temporal mismatch
between co-occurring species, but the importance of this effect is
difficult to assess due to lack of direct estimates of time averaging for
many higher taxa. Moreover, burial below the taphonomic active zone and
early diagenetic processes may alleviate taxonomic differences in
disintegration rates in subsurface sediments. We compared time averaging
across five phyla of major carbonate producers co-occurring in a sediment
core from the northern Adriatic Sea shelf. We dated individual bivalve
shells, foraminiferal tests, tests and isolated plates of irregular and
regular echinoids, crab claws, and fish otoliths. In spite of different
skeletal architecture, mineralogy, and life habit, all taxa showed very
similar time averaging varying from ~1800 to ~3600 yr (interquartile age
ranges). Thus, remains of echinoids and crustaceans—two groups with
multi-elemental skeletons assumed to have low preservation potential—can
still undergo extensive age mixing comparable to that of the co-occurring
mollusk shells. The median ages of taxa differed by as much as ~3700 yr,
reflecting species-specific timing of seafloor colonization during the
Holocene transgression. Our results are congruent with sequestration models
invoking taphonomic processes that minimize durability differences among
taxa. These processes together with temporal variability in skeletal
production can overrule the effects of durability in determining temporal
resolution of multi-taxic fossil assemblages.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49970.1/613544/Multiple-phyla-one-time-resolution-Similar-time
Early incubation and prolonged maturation of large ignimbrite magma
bodies: Evidence from the Southern Rocky Mountain volcanic field,
Colorado, USA
Peter W. Lipman; Matthew J. Zimmerer; Amy K. Gilmer
Abstract:
Clusters of early central volcanoes in the mid-Cenozoic Southern Rocky
Mountain volcanic field (SRMVF; southwestern Colorado, USA) record sites of
initial magmatic focusing that led to assembly of sizable upper-crustal
magma bodies capable of generating large ignimbrites. Peak growth at
precursor andesitic volcanoes was followed by extended periods (0.5 to
>2 m.y.) of reduced eruptive activity during inferred prolonged
incubation of the crustal reservoir prior to eruption of ignimbrites at the
San Juan magmatic locus, as exemplified by the 5000 km3 Fish
Canyon Tuff and associated La Garita caldera. After a magma system became
thermally mature and compositionally evolved, additional large ignimbrites
could erupt more rapidly from polycyclic calderas. In contrast, incubation
times for smaller ignimbrite magmas, as at Crater Lake, Oregon, were
briefer than for San Juan systems. Plutonic counterparts to the
temporal-compositional assembly of arc-ignimbrite magmas are exemplified by
incrementally emplaced granitoid intrusions like the Mesozoic Tuolumne
complex in the Sierra Nevada.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49964.1/613545/Early-incubation-and-prolonged-maturation-of-large
A tropically hot mid-Cretaceous North American Western Interior Seaway
Matthew M. Jones; Sierra V. Petersen; Allison N. Curley
Abstract:
The mid-Cretaceous thermal maximum (KTM) during Cenomanian to Santonian
times from ca. 100 to 83 Ma is considered among Earth’s warmest sustained
intervals of the Phanerozoic. The time interval is also characterized by
major paleoceanographic changes in the form of an oceanic anoxic event and
the flooding of epicontinental seaways, such as the Western Interior Seaway
in North America. We report carbonate clumped isotope (Δ47)
paleotemperatures (TΔ47) of the KTM measured from
Cenomanian oyster fossils of the Western Interior Seaway. Following
screening of specimens for carbonate diagenesis and exclusion of geographic
zones with evidence consistent with solid-state Δ47 reordering,
a mean TΔ47 of 28–34 °C (95% confidence interval for
the standard error of mean) for primary oyster calcite quantifies extreme
mid-latitude warmth in North America. When combined with existing Campanian
and Maastrichtian marine TΔ47 records, the new data
constrain Late Cretaceous temperature trends underlying the evolution of
North American faunal and stratigraphic records. These T Δ47 data from the peak KTM highlight the potential of this proxy
to quantitatively resolve the upper thermal limits of Phanerozoic
greenhouse climates.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49998.1/613546/A-tropically-hot-mid-Cretaceous-North-American
The influence of glacial isostatic adjustment on continental shelf
stratigraphic correlation
Meghan E. King; Jessica R. Creveling
Abstract:
Glacial isostatic adjustment (GIA) imparts geographic variability in the
amplitude and timing of local sea-level (LSL) change arising from
glacial-interglacial oscillations relative to a global mean signal
(eustasy). We modeled how GIA manifests in the stratigraphic record across
four shelf-perpendicular transects moving progressively more distal to the
Quaternary North American ice complex, subject to varying amounts of GIA
during glacial-interglacial cycles. Along each transect, we obtained LSL
histories for nine sites between 1 m and 250 m water depth from the output
of a gravitationally self-consistent GIA model run from marine oxygen
isotope stage (MIS) 11 to the present. We paired each site’s unique LSL
history with 50 identical annual sedimentation models to create a library
of 400-k.y.-duration synthetic stratigraphic columns (each assuming no
tectonics). Comparison of the suite of synthetic stratigraphic columns
between transects for a given bathymetric depth reveals latitudinal
differences in the stratigraphically determined number, magnitude, and age
of glacial-interglacial cycles, as inferred from stratigraphic sequence
count, apparent water-depth change, and age of preserved deglacial
transgression. We conclude that, for many field locales, extraction of
primary information about the number, scale, and duration of pre-Cenozoic
glacial-interglacial cycles from continental shelf stratigraphic records
near ice sheets demands a deconvolution of the GIA signal.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49841.1/613547/The-influence-of-glacial-isostatic-adjustment-on
A newly discovered subglacial lake in East Antarctica likely hosts a
valuable sedimentary record of ice and climate change
Shuai Yan; Donald D. Blankenship; Jamin S. Greenbaum; Duncan A. Young; Lin
Li ...
Abstract:
The Princess Elizabeth Land sector of the East Antarctic Ice Sheet is a
significant reservoir of grounded ice and is adjacent to regions that
experienced great change during Quaternary glacial cycles and Pliocene warm
episodes. The existence of an extensive subglacial water system in Princess
Elizabeth Land (to date only inferred from satellite imagery) bears the
potential to significantly impact the thermal and kinematic conditions of
the overlying ice sheet. We confirm the existence of a major subglacial
lake, herein referred to as Lake Snow Eagle (LSE), for the first time using
recently acquired aerogeophysical data. We systematically investigated
LSE’s geological characteristics and bathymetry from two-dimensional
geophysical inversion models. The inversion results suggest that LSE is
located along a compressional geologic boundary, which provides reference
for future characterization of the geologic and tectonic context of this
region. We estimate LSE to be ~42 km in length and 370 km2 in
area, making it one of the largest subglacial lakes in Antarctica.
Additionally, the airborne ice-penetrating radar observations and
geophysical inversions reveal a layer of unconsolidated water-saturated
sediment around and at the bottom of LSE, which—given the ultralow rates of
sedimentation expected in such environments—may archive valuable records of
paleoenvironmental changes and the early history of East Antarctic Ice
Sheet evolution in Princess Elizabeth Land.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50009.1/613548/A-newly-discovered-subglacial-lake-in-East
Evidence for benthic oxygen production in Neoarchean lacustrine
stromatolites
Dylan T. Wilmeth; Stefan V. Lalonde; William M. Berelson; Victoria
Petryshyn; Aaron J. Celestian ...
Abstract:
The evolution of oxygenic photosynthesis fundamentally altered the global
environment, but the history of this metabolism prior to the Great
Oxidation Event (GOE) at ca. 2.4 Ga remains unclear. Increasing evidence
suggests that non-marine microbial mats served as localized “oxygen oases”
for hundreds of millions of years before the GOE, though direct examination
of redox proxies in Archean lacustrine microbial deposits remains
relatively limited. We report spatially distinct patterns of positive and
negative cerium (Ce) anomalies in lacustrine stromatolites from the 2.74 Ga
Ventersdorp Supergroup (Hartbeesfontein Basin, South Africa), which
indicate that dynamic redox conditions within ancient microbial communities
were driven by oxygenic photosynthesis. Petrographic analyses and rare
earth element signatures support a primary origin for Ce anomalies in
stromatolite oxides. Oxides surrounding former bubbles entrained in mats
(preserved as fenestrae) exhibit positive Ce anomalies, while oxides in
stromatolite laminae typically contain strong negative Ce anomalies. The
spatial patterns of Ce anomalies in Ventersdorp stromatolites are most
parsimoniously explained by localized Ce oxidation and scavenging around
oxygen bubbles produced by photosynthesis in microbial mats. Our new data
from Ventersdorp stromatolites supports the presence of oxygenic
photosynthesis ~300 m.y. before the GOE, and add to the growing evidence
for early oxygen oases in Archean non-marine deposits.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49894.1/613549/Evidence-for-benthic-oxygen-production-in
Cenozoic delamination of the southwestern Yangtze craton owing to
densification during subduction and collision
Jun Wang; Qiang Wang; Chuan-Bing Xu; Wei Dan; Zhuo Xiao ...
Abstract:
It is widely thought that oceanic subduction can trigger cratonic keel
delamination, but the southwestern Yangtze craton (SYC; southwestern China)
lost its lower keel during Cenozoic continental collision. The upper mantle
beneath the thinned SYC contains its incompletely delaminated keel, which
has high-velocity seismic anomalies. Combining geophysical observations
with the geochemistry of Eocene mafic potassic lavas derived from the SYC
mantle at different depths, we suggest that the deep (~130 km) delaminated
lithosphere was more fertile and dense, with low-forsterite (Fo; molar 100
× Mg/[Mg + Fe] = 91.3) and high-δ18O (5.9‰) olivine, than the
shallow (~55 km) intact lithosphere (Fo = 94.2; δ18O = 5.2‰),
although both were rehydrated and oxidized. The deep keel underwent strong
refertilization and densification owing to the addition of Fe-rich basaltic
melts during earlier oceanic subduction. Subduction-driven refertilization
and subsequent collision-driven cooling caused cratonic keel delamination
due to compositional and thermal densification rather than hydration- or
oxidation-induced rheological weakening. Our study provides an example of
Cenozoic cratonic keel delamination in a collisional orogen and highlights
the key roles of compositional and thermal densification in delamination
during subduction and collision.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49732.1/613550/Cenozoic-delamination-of-the-southwestern-Yangtze
Nd isotopic evidence for enhanced mafic weathering leading to
Ordovician cooling
Christopher T. Conwell; Matthew R. Saltzman; Cole T. Edwards; Elizabeth M.
Griffith; Y. Datu Adiatma
Abstract:
It remains unclear whether waning of the volcanic degassing CO2
source or enhancement of the mafic (Ca, Mg-silicate) weathering CO 2 sink, or both, caused global cooling leading to the Ordovician
greenhouse–icehouse transition. We present a uniquely age-constrained and
integrated Middle–Late Ordovician (470–450 Ma) continental weathering
isotopic proxy data set (87Sr/86Sr and ε Nd(t)) from carbonate rocks of the Antelope Range of central
Nevada, USA, paired with published paleotemperature proxy measurements (δ 18O) of conodont apatite from the same locality. This suite of
proxy records signals an increase in mafic weathering of the Taconic
mountains (eastern United States) at ca. 463 Ma, which forced a period of
global cooling. We adapt a 87Sr/86Sr and pCO 2 mass balance approach to model CO2 drawdown during
the Ordovician, and show that a combined decrease in volcanic degassing and
increase in mafic weathering approximately halves pCO2
in agreement with δ18O trends and paleotemperature
reconstructions.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49860.1/613520/Nd-isotopic-evidence-for-enhanced-mafic-weathering
830-million-year-old microorganisms in primary fluid inclusions in
halite
Sara I. Schreder-Gomes; Kathleen C. Benison; Jeremiah A. Bernau
Abstract:
Primary fluid inclusions in bedded halite from the 830-m.y.-old Browne
Formation of central Australia contain organic solids and liquids, as
documented with transmitted light and ultraviolet–visible (UV-vis)
petrography. These objects are consistent in size, shape, and fluorescent
response with cells of prokaryotes and eukaryotes and with organic
compounds. This discovery shows that microorganisms from saline
depositional environments can remain well preserved in halite for hundreds
of millions of years and can be detected in situ with optical
methods alone. This study has implications for the search for life in both
terrestrial and extraterrestrial chemical sedimentary rocks.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49957.1/613521/830-million-year-old-microorganisms-in-primary
The problem of paleo-planforms
Sinéad J. Lyster; Alexander C. Whittaker; Elizabeth A. Hajek
Abstract:
Reconstructing river planform is crucial to understanding ancient fluvial
systems on Earth and other planets. Paleo-planform is typically interpreted
from qualitative facies interpretations of fluvial strata, but these can be
inconsistent with quantitative approaches. We tested three well-known
hydraulic planform predictors in Cretaceous fluvial strata (in Utah, USA)
where there is a facies-derived consensus on paleo-planform. However, the
results of each predictor are inconsistent with facies interpretations and
with each other. We found that one of these predictors is analytically best
suited for geologic application but favors single-thread planforms. Given
that this predictor was originally tested using just 53 data points from
natural rivers, we compiled a new data set of hydraulic geometries in
natural rivers (n = 1688), which spanned >550 globally
widespread, sand- and gravel-bed rivers from various climate and vegetative
regimes. We found that the existing criteria misclassified 65% of
multithread rivers in our data set, but modification resulted in a useful
predictor. We show that depth/width (H/W) ratio alone is
sufficient to discriminate between single-thread (H/W
> 0.02) and multithread (H/W < 0.02) rivers,
suggesting bank cohesion may be a critical determinant of planform.
Further, we show that the slope/Froude (S/Fr) ratio is useful to
discriminate process in multithread rivers; i.e., whether generation of new
threads is an avulsion-dominated (anastomosing) or bifurcation-dominated
(braided) process. Multithread rivers are likely to be anastomosing when S/Fr < 0.003 (shallower slopes) and braided when S/Fr
> 0.003 (steeper slopes). Our criteria successfully discriminate
planform in modern rivers and our geologic examples, and they offer an
effective approach to predict planform in the geologic past on Earth and on
other planets.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49867.1/613522/The-problem-of-paleo-planforms
Claspers in the mid-Cambrian Olenoides serratus
indicate horseshoe crab–like mating in trilobites
Sarah R. Losso; Javier Ortega-Hernández
Abstract:
Sexual reproduction represents a fundamental aspect of animal biology, but
the diversity of reproductive strategies among early Paleozoic metazoans
remains obscure. Direct evidence of reproductive strategies comes from
exceptionally preserved egg masses in Cambrian and Ordovician euarthropods
such as waptiids and trilobites, but anatomical or behavioral adaptations
for mating in these taxa are all but unknown. We demonstrate the presence
of functionally specialized appendages in the mid-Cambrian (Wuliuan)
Burgess Shale trilobite Olenoides serratus. New material of O. serratus preserves significantly modified and reduced
endopodites underneath the seventh thoracic and first pygidial tergites.
Comparison with extant euarthropods indicates that these specialized limbs
are functional analogs to claspers, which are used by sexually mature males
to grasp females prior to or during mating. The claspers in O. serratus were most likely used by the male to hold onto the
posterior pygidial spines of the female during amplex, similar to the
strategy observed in the horseshoe crab Limulus polyphemus. The
new appendicular data from O. serratus provide the first direct
evidence for trilobite sexual dimorphism based on the non-biomineralized
ventral anatomy. Our findings illuminate the reproductive biology of
trilobites and indicate that complex mating behaviors observed in extant
euarthropods originated during the Cambrian explosion.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49872.1/613523/Claspers-in-the-mid-Cambrian-Olenoides-serratus
Late glacial–Holocene record of Southern Hemisphere westerly wind
dynamics from the Falkland Islands, South Atlantic Ocean
Alistair Monteath; Paul Hughes; Matthew Cooper; Dulcinea Groff; Rob Scaife
...
Abstract:
The Southern Hemisphere westerly wind belt (SHWW) is a major feature of
Southern Hemisphere, midlatitude climate that is closely linked with the
sequestration and release of CO2 in the Southern Ocean. Past changes in the
strength and position of this wind belt are poorly resolved, particularly
across the Pleistocene-Holocene transition, a time period associated with
fluctuations in atmospheric temperatures and CO2 levels. We used
dust geochemistry, particle size measurements, and paleoecological analyses
from a peat sequence in the Falkland Islands, South Atlantic Ocean, to
describe changes in the SHWW between 16.0 and 6.5 ka (thousands of years
before CE 1950). Wind strength was low at ~51°S before and during the
Antarctic Cold Reversal (ACR, 14.9–13.0 ka), intensified between 13.1 and
12.1 ka as atmospheric temperatures increased, and then weakened, reaching
a minimum between 12.1 and 10.9 ka during the Early Holocene thermal
maximum. Northwesterly air masses became more dominant from 12.0 to 10.2
ka, and wind strength remained low until our record was affected by a storm
surge or tsunami ca. 7.8 ka. These data indicate a southward shift in the
latitude of the SHWW, from north of 51°S prior to and during the ACR, at
~51°S before the onset of the Holocene, and south of 51°S during the early
Holocene thermal maximum. This pattern suggests that the latitude of the
SHWW was coupled with atmospheric temperatures through the
Pleistocene-Holocene transition.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49805.1/613524/Late-glacial-Holocene-record-of-Southern
Extensive evidence for a last interglacial Laurentide outburst (LILO)
event
Yuxin Zhou; Jerry McManus
Abstract:
A catastrophic last interglacial Laurentide outburst (LILO) event
approximately 125,000 years ago (125 ka) may have contributed to abrupt
climate change during the last interglacial. It has been proposed that this
event was an analog of the Holocene 8.2 ka event. We characterize in detail
the (1) provenance, (2) timing, and (3) delivery mechanism of a layer of
red sediments deposited across much of the northwestern Atlantic Ocean at
125 ka. Our observations provide strong support for the occurrence of a
LILO event that was analogous to the 8.2 ka event in all three aspects, and
likely surpassed it in magnitude. The freshwater discharge associated with
the 125 ka LILO event may explain a series of abrupt global changes,
including a reduction of the North Atlantic Deep Water and reinvigoration
of the Antarctic Bottom Water. Our findings suggest that the mechanism that
triggered the LILO event may be an integral part of the deglacial sequence
of events, during which the final collapse of the contiguous Laurentide Ice
Sheet took place 3.5–4 k.y. after full interglacial temperature was reached
in the middle and high northern latitudes.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49956.1/613525/Extensive-evidence-for-a-last-interglacial
Diapirism of carbonate platforms subducted into the upper mantle
Mihai N. Ducea; Claire A. Currie; Constantin Balica; Iuliana Lazar; Ananya
Mallik ...
Abstract:
Subduction of lithospheric plates at convergent margins leads to transport
of materials once close to or at the surface of Earth to great depths. Some
of them later return to the surface by magmatism or degassing, whereas
others end up being stored in the mantle for long periods of time. The fate
of carbon-bearing minerals in subduction is of particular interest because
they can arbitrate the long-term availability of CO2 at the
surface. However, there are major gaps in the understanding of even the
most fundamental processes that modulate carbon pathways at mantle depths.
We use geodynamic models to understand carbonate pathways upon subduction
in the form of large carbonate platforms, which were common in the Tethys
realm of Europe. We conducted a series of geodynamic forward models for a
1-km-thick carbonate platform entering subduction. We show that most of the
carbonate load detaches from the subducting slab and rises up diapirically
through the mantle wedge and eventually mixes with the mantle lithosphere.
A smaller fraction gets accreted under the forearc, whereas an even smaller
fraction descends deeper into the mantle. The cold diapiric plume has a
significant role in retarding silicate mantle melting above these
subduction zones and promoting the formation of small-volume carbonate-rich
melts and, in some cases, alkaline silica-undersaturated silicate melts. We
propose that large amounts of CO2 can be stored as carbonate in
the shallow uppermost lithospheric mantle.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G50000.1/613526/Diapirism-of-carbonate-platforms-subducted-into
An explosive volcanic origin identified for dark sand in Aeolis Dorsa,
Mars
Devon M. Burr; Christina E. Viviano; Timothy I. Michaels; Matthew
Chojnacki; Robert E. Jacobsen
Abstract:
Dark, windblown (eolian) sand on Mars has produced significant geologic
effects throughout Martian history. Although local and regional sand
sources have been identified, a primary origin, or genesis, for Martian
sand has not been demonstrated. This knowledge gap was recently heightened
by the discovery of widespread sand motion, implying breakdown of grains to
sub-sand sizes. To address the question of sand genesis, we investigated
the source(s) of sand in Aeolis Dorsa (AD), the westernmost Medusae Fossae
Formation, using comparisons to sand potentially sourced from multiple
regions, each connoting a different sand genesis. Our methods included
comparison of (1) AD sand mineralogies with those of possible sand source
features, and (2) mapped AD sand deposits and inferred emplacement
directions with modeled sand deposit locations and transport pathways. The
results point to a time-transgressive unit, interpreted as pyroclastic, as
a source of dark sand. High-resolution images of this unit reveal outcrops
with dark sand weathering out of lithified bedrock. Given the extent of
interpreted pyroclastic deposits on Mars, this sand genesis mechanism is
likely widespread today and operated throughout Martian history. Whereas
this work identified olivine-rich sand, a range of original pyroclastic
lithologies would account for the mineralogic variability of dune fields on
Mars. These findings can be tested through analyses of other pyroclastic
deposits and potentially by data from the NASA Curiosity rover in
nearby Gale crater.
View article:
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G49814.1/613527/An-explosive-volcanic-origin-identified-for-dark
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