Dr. Steve Dworkin
Dr. Steve Dworkin
Department of Geology
One Bear Place #97354
Waco TX 76798
Phone (254) 710-2186
Fax (254) 710-2673
Room C425, Baylor Sciences Building
Ph.D., University of Texas - Austin, 1991
I study the low temperature aqueous and isotope geochemistry of sedimentary rocks and waters. My main focus is on paleoclimate reconstructions of terrestrial environments using the chemistry of paleosol calcite and organic matter. Our research group is currently studying environmental conditions during the Triassic using paleosols preserved in the Chinle Formation at the Petrified Forest National Park, Arizona. We also are continuing our work on paleosols that span the K/T boundary from west Texas.
By measuring the isotopic composition of dispersed organic matter in bulk paleosols, it is possible to reconstruct the carbon isotopic composition of the late Cretaceous and early Tertiary atmosphere. This is being carried out using paleosols from Big Bend National Park in west Texas (Dworkin, 2009).
Scott Douglas is a Masters student studying the sedimentology and depositional setting of the Jurassic Norphlet Sandstone in the offshore of the Gulf of Mexico. Scott is in the midst of collecting and synthesizing his data.
Jana Edwards recently graduated with a Masters degree. She studied the organic geochemistry of the Barnett Shale. Her project was funded by the EnCana Oil Company.
Stephen Clark recently graduated with a Masters degree. He studied the abundance and character of organic matter in Cretaceous rocks of central Texas.
Jenny Seitz recently completed a senior thesis entitled "Temporal Trends in Mineral Assemblages and Abundances from Paleosols that Span the Cretaceous-Tertiary Boundary, Big Bend, Texas". Jenny became proficient at running the X-ray diffractometer and she quantified the abundance of minerals in paleosols.
Lisa Turpin recently completed a senior thesis entitled "Grain Size Distribution and Organic Matter Content of Triassic Paleosols in the Chinle Formation, Petrified Forest National Park, Arizona. Lisa is an avid hiker who really enjoyed the long hikes out to her field area.
Gabriela Keeton recently completed a senior thesis entitled "Grain Size Distribution and Organic Matter Content from Paleosols that Span the Cretaceous-Tertiary Boundary, Big Bend, Texas". Gabby spent long hours using the elemental analyzer and the laser diffraction grain size analyzer.
Amy Fitzpatrick recently completed a Senior Thesis entitled "Provenance and Diagenesis of Chinle Formation Sandstones, Petrified Forest National Park, Arizona".
Dworkin, S.I., Nordt, L., and Atchley, S., 2009, A 7 MA record of 13CO2 derived from organic matter in late Cretaceous and early Tertiary paleosols, GSA abstracts w/programs, v. 41
Seitz, J., Dworkin, S.I., Nordt, L., and Atchley, S., 2008, Temporal trends in mineral assemblages and abundance from paleosols that span the Cretaceous-Tertiary Boundary, Big Bend, Texas, GSA abstracts w/ programs, v. 38.
Keeton, G., Dworkin, S.I., Atchley, S., and Nordt, L., 2008, Grain size distribution and organic matter content from paleosols that span the Cretaceous-Tertiary boundary, Big Bend, Texas, GSA abstracts w/ programs, v. 38.
Cleveland, D.M., Nordt, L.C., Dworkin, S.I., and Atchley, S.C., 2008, Pedogenic carbonate isotopes as evidence for extreme climatic events preceding the Triassic-Jurassic boundary: Implications for the biotic crisis?: Geological Society of America Bulletin, v. 120, p. 1408-1415.
Feng Z. D., Wang L.X., Ji Y.H., Guo L.L., and Dworkin S.I., 2007, Climatic dependency of soil organic carbon isotopic composition along the S-N transect from 34N to 52N in central-east Asia, Paleogeography, Paleoclimatology, Paleoecology, v. 257, p. 335-343
Scott JT, Doyle RD, Back JA, Dworkin SI, 2007, The role of N2 fixation in alleviating N limitation in wetland metaphyton: Enzymatic, isotopic, and elemental evidence, Biogeochemistry, v. 84, p. 207-218