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TEACHING
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Selected Research Topics

Garnet Geochronology

Carbonate Geochronology and CO2 Fluxes

Dehydration Reaction Kinetics and the Global Water Cycle

Noble Gas Diffusion & Geochronology

Rates and Timescales of Metamorphism

TIMS Facility

Field Work Photos

 

 

 

 

 

 

Research in the Baxter Group

Dehydration Reaction Kinetics and the Global Water Cycle

Plate boundary processes involve the production, consumption, and transport of fluids, as well as the evolving physical properties of the solid earth. Metamorphic reactions are at the roots of these processes. Model predictions of subduction zone phenomena (including devolatilization, magma genesis, and eclogitization) and regional orogeny require some quantification of the rate and timescale over which metamorphic reactions in the crust and mantle proceed.

 

Garnet frequently grows during dehydration, thus preserving a record of these reactions during metamorphism. In this research, we are integrating high precision zoned garnet geochronology with thermodynamic analysis of garnet forming dehydration reactions to directly measure dehydration fluxes in subduction zones and regional orogeny. Ongoing research has focused on well preserved garnet-bearing blueschists on the islands of Sifnos and Syros, Greece as well as large rotated garnets from Townshend Dam, Vermont.

 

Relevant Grant Support

 

NSF Grant EAR-1250497 "Collaborative Research: Field-Based Quantification of Dehyration Flux from Subducting Lithologies, Syros and Sifnos, Greece", 1/1/13, PI: Baxter; Co-PIs: Caddick

 

NSF Grant EAR-0911582 “Collaborative Research: Developing a Practical and Quantitative Method for Measurement of Metamorphic Porphyroblast Crystallization Kinetics and Strain Rate”, 7/1/09, PI: Hirsch; Co-PIs: Stowell, Baxter

 

NSF Grant EAR-0547999 “CAREER: Rates and Timescales of Metamorphic Reactions at Convergent Plate Boundaries”, 1/1/06, PI: Baxter

 

Selected Publications

Baxter EF, Caddick MJ, 2013. Garnet as a proxy for progressive subduction zone dehydration. Geology, v.41, p. 643-646 (PDF)

 

Dragovic B, Samanta LM, Baxter EF, Selverstone J, 2012. Using Garnet to Constrain the Duration and Rate of Water-Releasing Metamorphic Reactions During Subduction: An Example from Sifnos, Greece. Chemical Geology, v. 314-317. p. 9-22. (link to paper)

 

 

 

 

 

Boston College, Earth & Environmental Sciences, 140 Commonwealth Ave., Chestnut Hill, MA 02467
Phone: 1 (617) 552-1124
Email: ethan.baxter@bc.edu