Integrated Research Studies - Geophysics, Structure, and Fluid Flow
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At all spatial scales, mineral-resource investigations require interdisciplinary geological data and interpretations in three dimensions. This is especially the case in areas where mineral deposits may be concealed beneath cover. At present, 3-D maps utilizing integrated geophysical, geologic, and geochemical data are not available for much of the United States and strategically important regions abroad, yet such maps are necessary to understanding the distribution and location of mineral deposits in order to effect regional-scale mineralresource assessments and related investigations.
Mineral deposits form through feedbacks between multiple geological systems including tectonic and structural geologic systems, fluid reservoirs and fluid-flow systems, and geologic environment systems (e.g., subduction-boundary zones, foreland basins, accretionary wedges, etc.). Through the use of integrated geophysical, geologic, and geochemical investigations, this task has three major objectives: (1) To gain understanding about, describe, and map in three dimensions natural, interactive geological systems germane to ore formation with particular emphasis on regions with post-mineralization cover; (2) To understand how fluid-flow systems at different spatial scales couple with other natural systems to form mineral deposits and understand where in different geologic environments deposits are most likely to occur; and (3) Present task reserach results in 3-D format and at spatial scales useful in regional mineral-resource assessments.
Berger, B.R., 2012, Petrology and chemistry of the Green Acres gabbro complex near Winchester, Riverside County, California: Geological Society of America Special Paper XXX (D. Morton, ed.), 42 page manuscript, in press.
Reports and Articles
Anderson, R.E., Berger, B.R., and Miggins, D., 2012, Timing, magnitude, and style of Miocene deformation, west-central Walker Lane belt, Nevada: Lithosphere, doi:10.1130/L174.1, 22 p. (published on-line 4/12).
Anderson, R.E., and Beard, L.S., 2010, Geology of the Lake Mead Region: An overview, in Umhoeffer, P.J., Beard, L.S., and Lamb, M.A., eds., Miocene Tectonics of the Lake Mead Region, Central Basin and Range: Geological Society of America Special Paper 463, p. 1-28, doi:10.1130/2010.2463(01).
Anderson, R.E., Felger, T.J., Diehl, S.F., Page, W.R., and Workman, J.B., 2010, Integration of tectonic, sedimentary, and geohydrologic processes leading to a small-scale extension model for the Mormon Mountains area north of Lake Mead, in Umhoeffer, P.J., Beard, L.S., and Lamb, M.A., eds., Miocene Tectonics of the Lake Mead Region, Central Basin and Range: Geological Society of America Special Paper 463, p. 395-426, doi:10.1130/2010.2463(18) .
Beard, L.S., Campagna, D.J., and Anderson, R.E., 2010, Geometry and kinematics of the eastern Lame Mead fault system in the Virgin Mountains, Nevada and Arizona, in Umhoeffer, P.J., Beard, L.S., and Lamb, M.A., eds., Miocene Tectonics of the Lake Mead Region, Central Basin and Range: Geological Society of America Special Paper 463, p. 243-274, doi:10.1130/2010.2463(11).
Berger, B.R., 2007, The 3D fault and vein architecture of strike-slip releasing- and restraining bends: Evidence from volcanic-centre-related mineral deposits: Geological Society of London Special Publications 290, p. 447-471.
Berger, B.R., Ayuso, R.A., Wynn, J., and Seal, R.R., 2008, Preliminary model of porphyry copper deposits: U.S. Geological Survey Open-File Report 2008-1321, 55 p.Berger, B.R., and Henley, R.W., 2011, Magmatic-vapor expansion and the formation of high-sulfidation gold deposits: Structural controls on hydrothermal alteration and ore mineralization: Ore Geology Reviews, v. 39, p. 75-90, doi:10.1016/j.oregeorev.2010.11.004.
Berger, B.R., Hildenbrand, T.G., and O'Neill, J.M., 2011, Control of Precambrian basement deformation zones on emplacement of the Laramide Boulder batholith and Butte mining district, Montana, United States: U.S. Geological Survey Scientific Investigations Report 2011-5016, 29 p.
Biek, R.F., Rowley, P.D., Hayden, J.M., Hacker, D.B., Willis, G.C., Hintze, L.F., Anderson, R.E., and Brown, K.D., 2009, Geologic map of the St. George and east part of the Clover Mountains 30'x60' Quadrangles, Washington and Iron Counties, Utah: Utah Geological Survey Map 242, 1:100,000.
Blakely, R.J., John, D.A., Box, S.E., Berger, B.R., Fleck, R.J., Ashley, R.P., Newport, G.R., and Heinemeyer, G.R., 2007, Crustal controls on magmatic-hydrothermal systems: A geophysical comparison of White River, Washington, with Goldfield, Nevada: Geosphere, v. 3, p. 91-107, doi:10.1130/GES00071.1.
Henley, R.W., and Berger, B.R., 2012, Pyrite–sulfosalt reactions and semimetal fractionation in the Chinkuashih, Taiwan, copper–gold deposit: A 1 Ma paleo-fumarole: Geofluids, 12(3), p. 245-260, doi:10.1111/j.1468-8123.2012.00367.x.
Henley, R.W., and Berger, B.R., 2011, Magmatic-vapor expansion and the formation of high-sulfidation gold deposits: Chemical controls on alteration and mineralization: Ore Geology Reviews, v. 39, p. 63-74, doi:10.1016/j.oregeorev.2010.11.003.
Mavrogenes, J., Henley, R.W., Reyes, A.G., and Berger, B.R., 2010, Sulfosalt melts: Evidence of high-temperature vapor transport of metals in the formation of high-sulfidation lode gold deposits: Economic Geology, v. 105, p. 257-262, doi:10.2113/gsecongeo.105.2.257.
Presentations, Posters, Abstracts
Anderson, R.E., and Berger, B.R., 2007, A blister hypothesis for the central Mojave metamorphic core complex near Barstow, California: Geological Society of America Abstracts with Programs, v. 39, no. 6, p. 227. View Anderson GSA abstract.
Berger, B.R., and Anderson, R.E., 2007, Reinterpretation of the structural setting and relative age of epithermal silver-barite mineralization at the Waterman mine near Barstow, California: Geoological Society of America Abstracts with Programs, v. 39, no. 6, p. 624. View Berger GSA abstract.
Henley, R.W., and Berger, B.R., 2007, Magmatic vapor plumes, migrated extension, and the formation of epithermal high-sulfidation gold-copper deposits: Geoological Society of America Abstracts with Programs, v. 39, no. 6, p. 537. View Henley GSA abstract.
Box 25046 MS 973 Denver Federal Center
Denver, CO 80225-0046
Subtask Contact: Byron Berger