Brian Marshall

Biography

U.S. Geological Survey Yucca Mountain Project Branch, Geochemistry Team Chief (2007-2010) Leader of team of geochemists and hydrologists responsible for defining, executing, and reporting on research for a variety of projects both externally and internally funded. Primary research tasks are in support of the Department of Energy's Yucca Mountain Project. Accomplishments include 1) writing proposals and negotiating agreements for performance of hydrogeochemical analyses for a variety of outside organizations, 2) writing results of past research for publication in scientific journals, 3) maintaining contacts with DOE COR and science team members to determine future research directions, 4) coordinating support to DOE for responses to questions from the Nuclear Regulatory Commission concerning hydrogeochemistry, and 5) establishing budgets for tasks with external and appropriated funds. Manager of a diverse workforce ranging from college students in part-time positions to senior-level research scientists and emeritus scientists. As part of managing the Geochemistry Team in the Yucca Mountain Project Branch, developed budgeting databases and project management plans utilizing sophisticated software. Skilled analyst in the field of isotope geochemistry and chemical analysis and have coordinated and taught portions of both internal and external classes. Expertise in computer programming and familiar with many aspects of IT systems. Responsible for maintaining the Macintosh-compatible version of PHREEQC for distribution to the public.

U.S. Geological Survey Yucca Mountain Project Branch, Research Hydrologist/Geologist (1999-2007) Chemical and isotopic composition of pore water, rocks and secondary minerals in a thick vadose zone that is the proposed site of a nuclear waste repository. Responsible for formulating the research tasks, writing operating procedures, and publishing results, often with colleagues working on the same project. This research utilizes state-of-the-art analytical methods including thermal ionization mass spectrometry (TIMS), inductively-coupled plasma mass spectrometry (ICP-MS), X-ray fluorescence spectrometry, and ultra-centrifuge water extraction. Thermodynamic modeling of water chemistry utilizing PHREEQC; MacOS version maintained for public distribution. Thermal modeling was performed to explain the thermal state of the vadose zone over millions of years.

Publications:

Marshall, B.D. and Futa, K., 2003, Strontium in pore water from the Topopah Spring Tuff, Yucca Mountain, Nevada. Proceedings of the Tenth International High-Level Radioactive Waste Management Conference, Las Vegas, NV. American Nuclear Society, La Grange Park, IL, p. 373-376.

Marshall, B.D. and Futa, K., 2001. Strontium isotope evolution of pore water and calcite in the Topopah Spring Tuff, Yucca Mountain, Nevada. Proceedings of the Ninth International High-Level Radioactive Waste Management Conference, Las Vegas, NV. American Nuclear Society, La Grange Park, IL, (unpaginated CD-ROM) 09_5.

Marshall, B.D., 1999, Potassium-calcium decay system, in Encyclopedia of Geochemistry. Kluwer Academic Publishers, The Netherlands, p. 525-526. 

Marshall, B.D., 1999, Dating methods, in Encyclopedia of Geochemistry. Kluwer Academic Publishers, The Netherlands, p. 124-125. 

Marshall, B.D., Futa K., and Peterman Z.E., 1998, Hydrologic inferences from strontium isotopes in pore water from the unsaturated zone at Yucca Mountain, Nevada. Proceedings of FTAM: Field Testing and Associated Modeling of Potential High-Level Nuclear Waste Geologic Disposal Sites, Lawrence Berkeley National Laboratory LBNL-42520, p. 55-56. 

Marshall B.D., Paces J.B., Neymark L.A., Whelan J.F., and Peterman Z.E., 1998, Secondary minerals record past percolation flux at Yucca Mountain, Nevada. High Level Radioactive Waste Management Proceedings of the Eighth International Conference, p. 127-129. 

Marshall, B.D. and Mahan, S.A., 1994, Strontium isotope geochemistry of soil and playa deposits near Yucca Mountain, Nevada: High Level Radioactive Waste Management Proceedings, v. 5th, p. 2685-2691. 

Marshall, B.D., Stuckless, J.S., Peterman, Z.E., and Whelan, J.F., 1993, Isotopic studies of cavity filling and fracture coating minerals as an aid to understanding paleohydrology, Yucca Mountain, Nevada, USA, in Paleohydrological Methods and their Applications, Proceedings of NEA-OECD Workshop held November 1992, p. 147-159. 

Marshall, B.D., Whelan, J.F., Peterman, Z.E., Futa, K, Mahan, S.A., and Stuckless, J.S., 1992, Isotopic studies of fracture coatings at Yucca Mountain, Nevada: Proceedings of the Seventh International Symposium on Water-Rock Interaction, v. 1, p. 737-740. 

Marshall, Brian D. and Futa, Kiyoto, 1991, Lanthanide element mobility and Sm-Nd systematics in a contact metamorphic zone: Radiochimica Acta, v. 52/53, p. 405-411.

Marshall, Brian D. and DePaolo, Donald J., 1989, Calcium isotopes in igneous rocks and the origin of granite: Geochimica et Cosmochimica Acta, v. 53, p. 917-922.

Marshall, B.D., Woodard, H.H., and DePaolo, D.J., 1986, K-Ca-Ar systematics of authigenic sanidine from Waukau, Wisconsin, and the diffusivity of argon: Geology, v. 14, p. 936-938.

Marshall, B.D. and DePaolo, D.J., 1982, Precise age determinations and petrogenetic studies using the K-Ca method: Geochimica et Cosmochimica Acta, v.46, p. 2537-2545.