Greg B. Arehart

Office: 372 LMR
Lab: 475 LMR
Phone: (775) 784-6470
Lab phone: (775) 784-6970
Fax: (775) 784-1833

E-mail: arehartunr.edu

Home page: http://equinox.unr.edu/homepage/arehart/

Areas of Interest:
Economic geology, geothermal systems, igneous petrology, isotope geochemistry

Education:
Ph.D., University of Michigan, 1991
M.Sc. Colorado State University, 1978
B.Sc. Colorado State University

Current Research:
Greg Arehart received his BS and MS degrees at Colorado State University, and spent almost 10 years in the mining industry before returning for his PhD. He spent three years at Argonne National Laboratory and three years at IGNS (New Zealand) before being appointed to the UNR faculty in 1997. Much of his research has centered on hydrothermal mass fluxes in the crust, some of which ultimately form mineral deposits. This research has been funded by NSF, DOE, and private industry. Additional recent research interests include studies of continental paleoclimate and formation of tufas in late Pleistocene lakes in Nevada.

Since the early 1980s, he has been studying the origin of Carlin-type deposits, which comprise extremely fine-grained disseminated gold in calcareous rocks. These deposits are nearly unique to the Great Basin and provide 10% of the world’s gold, but their origin is poorly understood. Application of a wide variety of geochemical tools, at scales from microscale to regional scale, are beginning to provide important insights into the processes that result in these deposits.

His teaching responsibilities include undergraduate courses in Mineralogy, Ore Deposits, and Geology of the National Parks, plus a number of graduate courses in various topics related to high-temperature geochemical processes and mineral deposits.

Graduate Students:

Ellen Leavitt: Geology and age controls on the Midas epithermal deposit, Nevada
Rob Graves: Reaction of gold bisulfide with carbonaceous material
Scott Buchanan: Geochemical model for carbonate veins in and around Carlin-type deposits
Robert Wood: Geology and geochemistry of the Marigold Carlin-type deposit
Steven Neidig: Origin of the Motherlode-type mineralization at Jamestown, California
Gretchen Schmauder: Thermochemical profiling of gold deposits at Bald Mountain, Nevada

Selected Recent Publications (PDF copies of some of these available at GBA home page):

1. Leavitt, E.D., Spell, T.L, Wallace, A.R., Goldstrand, P.M., and Arehart, G.B., 2004, Geochronology of the Midas low-sulfidation epithermal gold-silver deposit, Elko County, Nevada: Economic Geology (in press).
2. Rosen, Michael R., Arehart, Greg B., and Lico, Michael, 2004, Exceptionally fast growth rate of <100 year old microbially mediated tufa, Big Soda Lake , Nevada ; Geology (in press).
3. Arehart, G.B., Chakurian, A.M., Tretbar, D.R., Christensen, J.N., Donelick, R.A. and McInnes, B.A., 2003, Review of radioisotope dating of Carlin-type deposits in the Great Basin, western North America, and implications for deposit genesis; Economic Geology, v. 98, p. 235-248.
4. Arehart, G.B., Coolbaugh, M.F., and Poulson. S.R., 2003, Evidence for a magmatic source of heat for the Steamboat Springs geothermal system using trace elements and gas geochemistry ; Geothermal Resources Council Transactions, v. 26, p. 479-481.
5. Chakurian, A.M., Arehart, G.B., Donelick R.A., Zhang, X., and Reiners, P.W. 2003, Timing Constraints of Gold Mineralization Along the Carlin Trend Utilizing Apatite Fission-Track, 40Ar/ 39Ar, and Apatite (U-Th)/He: Economic Geology, v. 98, p. 1159-1171.
6. Arehart, G.B., Wood, C.P., Christenson, B.W., Browne, P.R.L., and Foland, K.A., 2002, Timing of Volcanism and Geothermal Activity at Ngatamariki and Rotokawa, New Zealand: Implications for the Lifetimes of Geothermal Systems: Journal of Volcanology and Geothermal Research, v. 116, p. 201-214.
7. Arehart, G.B., and Poulson, S.R., 2001, Hydrothermal systems as indicators of paleoclimate: an example from the Great Basin, western North America; Proceedings of the Tenth International Water-Rock Interaction Conference, p. 87-90. Simmons, S.F., Arehart, G.B., Simpson, M.P. and Mauk, J.L., 2000, Origin of massive calcite veins in the Golden Cross, low sulfidation epithermal Au-Ag deposit, New Zealand, Economic Geology, v. 95, p. 99-112.
8. Tretbar, D., Arehart, G.B., and Christensen, J., 2000, Dating gold deposition in a Carlin-type gold deposit using Rb/Sr methods on the mineral galkhaite, Geology, v. 28, p. 947-950.