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University of Texas at Arlington    

115 Geoscience Bldg (Office)
LGRIFF at  uta.edu




News!
I've recently (Jan. 2013) joined the Department of Earth & Environmental Sciences at University of Texas at Arlington where I am busy setting up my labs and learning to be a Texan.

Greg Aaron (M.S. 2012) graduated in December 2012 and will be submitting his first paper soon.  He started work at the Pennsylvania Department of Environmental Protection.  Good luck Greg!

Hasanthi passed her qualifying exams and proposal defense (December 2012) and is officially a candidate for Ph.D.  Great job Hasanthi!

NSF Division of Undergraduate Education (DUE) Transforming Undergraduate Education in Science, Technology, Engineering and Mathematics (TUES) Research grant awarded with Anne Jefferson, Joe Ortiz, and David Dees (September 2012 - ) #1140980, "Bridging the conceptual divide between theoretical and applied environmental chemistry"

NSF Earth Sciences (EAR) Geobiology & Low Temperature Geochemistry grant awarded (March 1, 2011 - February 28, 2014) #1053312, "Collaborative Research: Stable strontium isotope ratios (88/86Sr) in abiotic and microbially mediated barite" with REU Supplement (Summer 2012)

April 2011 - Greg Aaron awarded Society of Economic Geologist Foundation Student Research Grant for $2225 from the Hugh E. McKinstry Fund, 
"A Geochemical and Hydrologic Comparison and Assessment of Acid Mine Drainage in Glaciated and Unglaciated Eastern Ohio" 

 
Research Interests

Stable Isotope Geochemistry: I employ nontraditional stable isotopes such as calcium (Ca) and strontium (Sr) in geologic systems as a new important tracer of variations in its cycling on various time scales and to add constraints to models of biomineralization.

Paleoceanography: Much of my research has focused on marine barite, which is useful as a recorder of isotopic and elemental changes in seawater chemistry through time and as a proxy for export production in the ocean especially valuable during periods of ocean acidification and extreme climate change.

Biogeochemistry: Collaborative work focused on modeling the changes in cycling of seawater Ca (constrained by my isotope data) has revealed periods of pronounced change corresponding to major climatic transitions such as the middle Miocene and I am currently looking at the implications of these results with higher resolution records over time intervals of extreme climate change (Eocene-Oligocene and Paleocene-Eocene boundaries).

Teaching 

Oceanography: ...

Principles of Geochemistry: ...

Hydrogeochemistry: ...

Environmental Isotopes: ...

Environmental Geochemistry: ...
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