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The Geological Society of America Penrose Conference

Revitalize your geology at GSA’s Penrose Conference, the premier small meeting for collaborative research around the world. Introducing a brand new format and criteria for submission.

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Current Conference:
Eclogites in Space and Time – Bridging the Micro to Planetary Scales

Rohnert Park, California, USA | 19–23 June 2025

 
Know Before
You Go
Program and
Abstract Volume
Field Guide
(Non-Peer Reviewed)
 

Attendee Documents

Certificate of Attendance
CEU Certificate
Conference Receipt

International Eclogite Conference

Eclogites in Space and Time — Bridging the Micro to Planetary Scales will represent the 15th meeting of the International Eclogite Conference (IEC-15). The IEC was established in 1982 to promote worldwide communication and cooperation among scientists who study high-pressure and ultrahigh-pressure rocks and processes.

Find out more about the IEC

 

Description

The multidisciplinary study of eclogites from micro to planetary scales over the past 50 years has significantly advanced our understanding of plate tectonics. Eclogites are both the recorders and drivers of planetary-scale tectonics, and their formation is involved in such diverse processes as the geochemical exchange between Earth’s surface and deep interior, intermediate-depth seismicity, and continental growth, collision, and evolution.

 

Objectives

The objective of this Penrose Conference is to bring together the international eclogite community and scientists working on subduction-zone processes to discuss recent advances in diverse fields (e.g., geodynamics, geochemistry, experimental petrology, and geochronology); catalyze breakthroughs in our understanding of subduction-zone processes; and chart future research on eclogites in space and time.

This Penrose Conference will represent the 15th International Eclogite Conference (IEC15) and will be the first time U.S.-based scientists host the international eclogite community at a dedicated conference.

 

Conference Format

The conference format will include oral presentations, poster presentations, breakout discussions, and mentoring opportunities for early career scientists. Attendees will be expected to observe the GSA Code of Ethics & Professional Conduct throughout the meeting.

The venue is close to some of the classic localities of the Franciscan Complex, which we will visit during two syn-conference field excursions. Learn more about the venue online.

 

Thematic Sessions

Eclogites, Micro to Macro Scales

What processes do eclogites and eclogite-facies rock reveal at different scales? How do new insights from micro-scale observations on high-pressure and ultrahigh-pressure (HP–UHP) metamorphic rocks better constrain and inform subduction-zone processes? This thematic session will explore the state of knowledge regarding bridging the scales in eclogite research.

Advances in Methods: Thermobarometry and Geo/ Thermochronology

Mineral assemblages preserved in HP–UHP metamorphic rocks challenge the assumption that equilibrium was attained during prograde, peak, and retrograde conditions. This thematic session will explore advances in thermo-barometry and geo/thermochronologic techniques used to determine the pressure-temperature-time-deformation (P-T-t-D) histories of eclogite and related rocks.

The Role of Eclogite in Geodynamics

This thematic session will explore how P-T-t paths and deformation histories of eclogites (and related rocks) can be used to improve our understanding of paleogeothermal gradients, and thus the thermal evolution of our planet. It will include how seismic tomography can be integrated with observations from exhumed rocks to constrain the role of eclogites in Earth’s geodynamic evolution.

The Franciscan and HP–UHP Rocks of the Circum-Pacific Realm

The Franciscan Complex of California is among the first natural laboratories for the study of subduction zones and subduction processes. This session will focus on how the Franciscan Complex and other HP–UHP terranes in the circum-Pacific realm formed and survived exhumation

to Earth’s surface. This thematic session will also explore how HP–UHP exhumation mechanisms differ between long-lived and transient subduction zones.

Rheology of the Subduction Interface: Deformation and Earthquake Processes

Can exhumed analogs in the subduction-related metamorphic rock record be used to constrain the rheology of the slab–mantle interface? How does the process of serpentinization affect fore-arc deformation and fluid transport in the mantle wedge? This thematic session will explore the rheology of the subduction interface as preserved in both the seismicity of active subduction zones and the geologic evolution of exhumed HP-UHP terranes.

Fluids, Melts, and Geochemical (Re)cycling in Subduction Zones

What are the roles of fluids and melts in the geochemical cycling in subduction zones? This thematic session will explore how observations on HP–UHP metamorphic rocks can constrain the sources, pressures, and volumes of fluids in subduction zones.

 
 
 

Sponsors

Logos and names of various meeting sponsors.
 

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