My research interests encompass a broad spectrum of geochemistry, including stable isotope geochemistry, volatile cycling, metamorphism and volatile transport in subduction zones, serpentinization, and fluid-rock interactions and metasomatism in the high-T environment. Most of my research involves using stable isotopes as a geochemical tracer of fluids in various tectonic settings. However, I have been involved in a wide range of research including, the isotopic composition of lunar samples and hyperarid soils.

I oversee the High Temperature Stable Isotope Lab which houses a ThermoElectron MAT 253, silicate laser extraction line, chlorine purification line, and TC/EA. The lab has the capabilities for oxygen, hydrogen, chlorine, nitrogen, carbon, and sulfur analyses in silicates (terrestrial and extraterrestrial), atmospheric and volcanic gases, carbonates, fluid inclusions, water, and phosphates.

http://www.jsg.utexas.edu/light-isotope/

I am not accepting new graduate students for the 2017-2018 academic year.

Areas of Expertise

Stable isotope geochemistry, metamorphism and volatile transport in subduction zones, fluid-rock interaction and metasomatism, geochemical cycling, stable chlorine isotopes


Society for Teaching Excellence, member - University of Texas at Austin (2011)

G. Moses and Carolyn G. Knebel Distinguished Teaching Award - JSG (2010)

GSA Subaru Outstanding Woman in Science Award - Geological Society of America (2009)

L'Oréal USA For Women in Science Fellowship - American Association for the Advancement of Science on behalf of L’Oréal (2007 - 2008)

V.C. Kelly Outstanding Doctoral Candidate Scholarship - University of New Mexico (2006)

Best Doctoral Candidate - Department of Earth and Planetary Sciences, University of New Mexico (2006)

Sigma Xi "Excellence in Graduate Research" Award - University of New Mexico, Sigma Xi chapter (2006)

Association for Women in Science Educational Foundation Gail Naughton predoctoral award - AWIS (2005)

Association for Women Geoscientists (Denver Chapter) Outstanding Geoscience Student Award - AWG (2002 - 2003)

National Science Foundation Graduate Student Fellowship - NSF (2001 - 2004)

Graduate Students

Miguel Cisneros, Ph.D., expected 2018 (Supervisor)
My research combines a broad range of disciplines, including geochemistry, structural geology, petrology, and chronology, to understand how high-pressure rocks from the Mediterranean are exhumed to the surface. I consider myself a stable isotope geochemist who applies multiple techniques to understand large-scale tectonic problems including volatile sourcing and fluid flow in subduction zones, and exhumation of high-pressure rocks.

Emily Cooperdock, Ph.D., expected 2017 (Committee Member)
Research Interests: Method development for (U-Th)/He analysis; Fe-oxide (U-Th)/He dating; X-Ray Computed Tomography application to geologic samples; timing of serpentinization in tectonic processes; trace element cycling during serpentinization; magnetite formation; U and Th partitioning during metamorphism

Edward W Marshall, Ph.D., expected 2017 (Co-supervisor)
I am currently studying the Colorado Plateau lithospheric mantle (CPLM), via xenoliths samples from the ca. 25 Ma Navajo Volcanic Field. My approach uses stable and radiogenic isotopes, nominally anhydrous mineral water contents, and Platinum Group Element (PGE) concentrations in sulfides. My PhD breaks down into three interrelated projects: 1) the long term geochemical evolution of the CPLM starting in the Proterozoic, 2) the more recent hydration and metasomatic overprint, and 3) the behavior of PGE elements in the CPLM and their relationship with hydration and metasomatic processes. Analytical techniques that I am familiar with are laser fluorination analysis for oxygen isotopes, SIMS analysis of nominally anhydrous mineral water contents, clean lab chemical separation methods for analysis of the Rb-Sr, Sm-Nd, Lu-Hf and Re-Os radiogenic systems, laser ICP-MS analysis of trace elements, and electron microprobe analysis of major elements. Other interests and projects of mine are the geology of the Philadelphia area, Anorthosite genesis, and laser fluorination technique development.

Owen A Callahan, Ph.D., expected 2017 (Committee Member)
I am interested in fluid flow in faults and fractures, specifically the interplay between chemical alteration, mechanical deformation, and conduit evolution in hydrothermal systems.

Evan J Ramos, M.S., expected 2017 (Co-supervisor)
I am a MS candidate interested in understanding the mechanisms of fluid flow and stable isotope transport during contact metamorphism. With constraints from stable isotope geochemistry, geochronology, and thermodynamic modeling, I plan to develop a numerical model that characterizes the mechanisms that formed a skarn system in the Sierra Nevada Batholith. An overarching goal of this research is to understand CO2 mobility in the shallow crust as a means to quantify the amount and rate of CO2 production from metamorphic reactions.

Jeffery T Cullen, Ph.D., expected 2016 (Supervisor)

Michelle L Gevedon (Supervisor)

Jessica Errico, M.S., 2012 (Supervisor)
The University of Texas at Austin


“Subduction Zone Cycling of Chlorine”, Yale University, (2011)

“The global chlorine cycle: a subduction zone perspective”, GeoPRISMS Implementation Workshop: Subduction Cycles and Deformation, (2011)

“Chlorine stable isotopes as a geochemical tracer in subduction zones", University of Texas at Arlington, (2009)

Chlorine stable isotopes as a geochemical tracer in subduction zones", University of New Mexico, (2009)

“Chlorine isotope distribution on Earth”, University of Houston, (2008)

“Chlorine isotope distribution on Earth”, University of California, Berkeley, (2008)

“Chlorine isotope distribution on Earth”, Rensselaer Polytechnic Institute, (2008)

“Tracing fluids in subduction zones using chlorine stable isotopes", Tufts University, (2008)

“Chlorine isotope distribution on Earth”, University of Texas at Austin, (2008)

“Studying serpentinization, seafloor tectonics, and arc volcanism using Cl stable isotopes”, Central Washington University, (2007)

“Studying serpentinization, seafloor tectonics, and arc volcanism using Cl stable isotopes”, New Mexico Tech, (2007)

“Studying serpentinization, seafloor tectonics, and arc volcanism using Cl stable isotopes”, Kansas State University, (2006)

“Tectonic and metamorphic implications of high chlorine contents in serpentinites”, University of Maine, (2006)

“Tectonic and metamorphic implications of high chlorine contents in serpentinites”, Rice University, (2006)

YearSemesterCourse
2016Fall GEO 394 Rsch In Geological Sciences
2016Fall GEO 388L Isotope Geology
2016Fall GEO 376C Isotope Geology
2016Fall GEO 173H Honors Research Methods III
2016Fall GEO 171H Honors Research Methods I
2016Fall GEO 401 Physical Geology
2016Spring GEO 171H Research Methods I
2016Spring GEO 371T Ins & Outs Of Subduction Zones
2016Spring GEO 172H Research Methods II
2016Spring GEO 173H Research Methods III
2016Spring GEO 391 Ins & Outs Of Subduction Zones
2016Spring GEO 394 Rsch In Hi-T Stbl Isotp Geochm
2015Fall GEO 394 Rsch In Geological Sciences
2015Fall GEO 388L Isotope Geology
2015Fall GEO 376C Isotope Geology
2015Fall GEO 173H Research Methods III
2015Fall GEO 171H Research Methods I
2015Fall GEO 401 Physical Geology
2015Spring GEO 394 Rsch In Hi-T Stbl Isotp Geochm
2015Spring GEO 172H Research Methods II
2014Fall GEO 401 Physical Geology
2014Fall GEO 171H Research Methods I
2014Fall GEO 172H Research Methods II
2014Fall GEO 173H Research Methods III
2014Fall GEO 376C Isotope Geology
2014Fall GEO 388L Isotope Geology
2014Fall GEO 394 Rsch In Hi-T Stbl Isotp Geochm
2014Spring GEO 394 Rsch In Hi-T Stbl Isotp Geochm
2014Spring GEO 391 Ins & Outs Of Subduction Zones
2014Spring GEO 371C Ins & Outs Of Subduction Zones