John N. Christensen
John Christensen is Staff Scientist, Energy Geoscience Division, LBNL.
Education
1992 Ph.D., Geology, University of California, Los Angeles. Dissertation: The Sr isotopic measurement of rates of tectonometamorphic processes: Case studies in Southeastern Vermont, USA and the Tauern Window, Eastern Alps
1987 M.S. Geology, University of California, Los Angeles. Thesis: A strontium isotopic study of processes in a silicic magma chamber: the Bishop Tuff, Long Valley, California
1982 B.A., Geology, University of California, Berkeley.
Research and Professional Experience
2006-present: Staff Geological Scientist, Energy Geoscience Division, LBNL
1999-2006: Geological Scientist, Energy Geoscience Division, LBNL
1997-1999: Asst. Research Scientist, Dept. Geological Sciences, Univ. of Michigan.
1992-1997: Post-Doctoral Research Fellow, Dept. Geological Sciences, Univ. of Michigan
Publications
5 publications most closely related to the proposed project:
1. Christensen, JN; Hofmann, AE; and DePaolo, DJ (2019) Isotopic Fractionation of Potassium by Diffusion in Methanol. ACS Omega, 4(5), 9497-9501 Link
2. Brown, ST; Basu, A; Ding, X; Christensen, JN; DePaolo, DJ (2018) Uranium isotope fractionation by abiotic reductive precipitation. PNAS, 115(35), 8688-8693. Link
3. Richter, FM; Watson, EB; Chaussidon, M; Mendybaev, R; Christensen, JN, Qiu, L (2014) Isotope Fractionation of Li and K in Silicate Liquids by Soret Diffusion. Geochimica Cosmochimica Acta 138, 136-145. Link
4. Richter, FM, Mendybaev, RA, Christensen, JN, Ebel, D, Gaffney, A (2011) Laboratory Experiments Bearing on the Origin and Evolution of Olivine-rich Chondrules. Meteoritics and Planet. Sci., 46, 1152-1178. Link
5. Bourg, IC, Richter, FM, Christensen, JN, Sposito, G (2010) Isotopic Mass-Dependence of Metal Cation Diffusion Coefficients in Liquid Water. Geochimica Cosmochimica Acta 74, 2249-2256. Link
5 other significant publications:
1. Christensen, JN; Qin, L; Brown, ST; DePaolo, DJ (2018) Potassium and calcium isotopic fractionation by plants (soybean [Glycine max], rice [Oryza sativa], and wheat [Triticum aestivum]). ACS Earth and Space Chemistry, 2(7), 745-752 Link
2. Christensen, JN; Dafflon, B; Shiel, AE; Tokunaga, TK; Wan, J; Faybishenko, B; Dong, W; Williams, KH; Hobson, C; Brown, ST; Hubbard, SS (2018) Using Strontium Isotopes to Evaluate the Spatial Variation of Groundwater Recharge. Science of the Total Environment, 637, 672-685. Link
3. DePaolo, DJ, Maher, K, Christensen, JN, and McManus, J (2006) Sediment Transport Time Measured with U-series Isotopes: Results from ODP North Atlantic Drift Site 984. Earth Planet. Sci. Letters., 248(1-2), 394-410. Link
4. Christensen, JN, Halliday, AN, Godfrey, LV, Hein, JR and Rea, DK (1997) Climate dynamics and the lead isotopic records in Pacific ferromanganese crusts. Science 277, 913-918. Link
5. Christensen, JN, Rosenfeld, JL and DePaolo, DJ (1989) Rates of tectonometamorphic processes from rubidium and strontium isotopes in garnet. Science, 224, 1465-1469. Link