Kathleen Scheiderich

Biography

My research interests are in developing new isotope methods and exploring the application of such systems; generally I work on aqueous and sediment/sedimentary rock samples (e.g., cores and black shales, respectively), but have also analysed metal isotopes in meteorites, experimentally-derived mineral products, igneous rocks, and cell-cultures. Example applications of environmental work that is relevant to USGS mission areas includes the use of Fe, Zn, and Ni isotopes as contaminant tracers, for example in acid mine drainage. Chromium isotopes and speciation, and molybdenum isotopes, are also areas of ongoing interest, particularly as applied to estuarine systems with complex redox processes are concerned. I have been working for the past year to develop and implement measurement of Cerium isotopes, both the stable and radiogenic components. This rare-earth element has a low-temperature redox change and may display isotope fractionation that will provide information useful to interpreting REE enrichment and behaviour in unconventional REE deposits, to stability of HREE-enriched carbonatites, and to paleoredox studies.  as I have many years of experience operating both Nu Plasma and Neptune multi-collector ICP-MS machines, as well as Triton Thermal Ionization MS, and have spent much of my time as a student and postdoc involved in method improvement/development/implementation, so I have a lot of experience with the fundamentals of ion-exchange chromatography and element separation methods. 

 

2014-2015: Central Mineral and Energy Resources Science Center, USGS, Mendenhall Postdoctoral Fellow, Cerium isotope systematics as insights towards control on low-temerpature rare-earth element enrichment and deposition.

2011-2013: CSIRO Land and Water, Contaminant Chemistry and Ecotoxicology program: Postdoctoral Research Fellow (Non-traditional stable isotopes as tracers of environmental processes and contamination-- Fe, Ni, Cu, Zn isotopes).

2010-2011: University of Saskatchewan, Saskatchewan Isotope Lab: Postdoctoral Fellow (Cr isotopes in the Saanich Inlet and Arctic Ocean).

2004-2010: University of Maryland, College Park, MD

Ph.D., Geology. Dr. R.J. Walker and Dr. G. Helz, Advisors.

Dissertation: Molybdenum isotope systematics in natural and experimental settings.

 2001-2004: University of Delaware, Lewes, DE

 M.S., Marine Studies. Dr. K. Billups, Advisor.

Thesis: Paired Mg/Ca and oxygen isotopes of Neogene foraminifera: Pacific and Indian Ocean tropic-subtropic paleoceanography and paleoclimate.

1996-2000: University of Rochester, Rochester NY

B.S., Biology-Geology; Minor, German

 

Publications:

Rosenthal, Y., S. Perron-Cashman et al., 2004. Laboratory inter-comparison study of Mg/Ca and Sr/Ca measurements in planktonic foraminifera for paleoceanographic research, Geochem., Geophys., Geosyst., doi:2003GC000650. 

Billups, K., Scheiderich, K., 2010. A synthesis of late Oligocene through Miocene deep sea temperatures as inferred from foraminiferal Mg/Ca ratios, Int. Assoc. Sedimentol. Spec. Publ. 42, 1-15.

Scheiderich, K., Helz, G.R., Walker, R.J., 2010. Century-long record of Mo isotopic composition in sediments of a seasonally anoxic estuary (Chesapeake Bay). Earth Planet. Sci. Lett., 289, 189-197.

Scheiderich, K., Zerkle, A., Helz., G.R., Farquhar, J., Walker, R.J., 2010. Molybdenum isotope, multiple sulfur isotope, and redox-sensitive element behavior in early Pleistocene Mediterranean sapropels, Chem. Geol. 279, 134-144.

Zerkle, A., Scheiderich, K., Maresca, J.A., Liermann, L., Brantley, S.L.,  2011. Molybdenum isotope fractionation by cyanobacterial assimilation during nitrate utilization and N2 fixation. Geobiology 9, 94-106.

Ryan, B., DeGryse, F., Kirby J., Harris, H., Mclaughlin, M., Scheiderich, K. 2013. Copper speciation and isotopic fractionation in plants: uptake and translocation mechanisms. New Phytologist 199, 367-378.

Ryan, B., Kirby, JK., DeGryse, F., Scheiderich, K., McLaughlin, M. 2014. Environmental Science and Technology, Copper isotope fractionation during equilibration with natural and synthetic ligands, 48, 8620-8626.

Scheiderich, K., Amini, M., Francois, R., Holmden, C. Global variability of chromium isotopes demonstrated by Pacific, Atlantic, and Arctic Ocean samples Earth and Planetary Science Letters, 423, 87-97, 2015.