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GSA Today, v. 9, no. 3, March 1999
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Table of Contents
Science Article: (View Abstract)
A New Magnetic View of Alaska
by Richard W. Saltus, Travis L. Hudson, Gerald G. Connard
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| In Memoriam |
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| GSA on the Web |
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| Environment Matters -- The Value of Mentors |
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| SAGE Remarks -- Introduction to Exploration Geophysics: A Web-based Learning
Environment |
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| Washington Report -- Acronym Immersion 101: Again |
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| Congressional Climate Change? |
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| Employment Matching Service |
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| More GSA Representatives Needed |
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| GSAF Update |
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| New GSA Field Forums Program |
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| Medals and Awards for 1998 |
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| 1999 Cordilleran Section Meeting |
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| Bulletin and Geology Contents |
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| Call for Geology Co-Editor |
42 |
| GSA Public Service Award |
43 |
| 1999 Shlemon Mentor Program |
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| New Bulletin Co-Editor |
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| 1999 GeoVentures |
44 |
| Award Nominations -- National Awards
for 2001 |
45 |
| 1999 GSA Meetings |
45 |
| Classifieds |
46 |
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A New Magnetic View of Alaska
by Richard W. Saltus, Travis L. Hudson, Gerald G. Connard
ABSTRACT
A new, publicly available aeromagnetic data compilation spanning Alaska enables
analysis of the regional crustal character of this tectonically diverse and poorly
understood part of the North American Cordillera. The merged data were upward-continued
by 10 km (mathematically smoothed without assumptions about sources) to enhance
crustal-scale magnetic features and facilitate tectonic analysis. This analysis
reveals a basic threefold magnetic character: (1) a southern region with arcuate
magnetic domains closely tied to tectonostratigraphic elements, (2) a magnetically
neutral interior region punctuated locally by intermediate and deep magnetic highs
representing a complex history, and (3) a magnetically subdued northern region
that includes a large deep magnetic high. Our tectonic view of the data supports
interpretations that Paleozoic extension and continental rift basins played a
significant role in the tectonic development of northern and interior Alaska.
Accretion of oceanic and continental margin terranes could be restricted to the
southern region. The new magnetic view of Alaska can be compared and contrasted
with other Pacific margin regions where convergent margin and accretionary tectonic
processes are important.
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