Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2354
Brittle Faults
Brittle shear zones/fault zones are usually defined by curved brittle P-planes bound by usually straight Y-planes. These shears may affect as a narrow zone within the rock bodies. Brittle sheared lenses of rocks vary in geometry, and the P-planes may curve only near the Y-planes. Fault gouge zones sometimes contain P-planes that help to deduce the shear sense. Fault planes/Y-planes may contain sli
Authors
Soumyajit Mukherjee
Evidence for outcrop-scale deformation band faults on Mars from Curiosity rover imagery
No abstract available.
Authors
Jonathan S. Caine, Ryan B. Anderson, Kenneth E. Herkenhoff, Glynis M. Parrett
Relationships between protein-encoding gene abundance and corresponding process are commonly assumed yet rarely observed
For any enzyme-catalyzed reaction to occur, the corresponding protein-encoding genes and transcripts are necessary prerequisites. Thus, a positive relationship between the abundance of gene or transcripts and corresponding process rates is often assumed. To test this assumption, we conducted a meta-analysis of the relationships between gene and/or transcript abundances and corresponding process ra
Authors
Jennifer D. Rocca, Edward K. Hall, Jay T. Lennon, Sarah E. Evans, Mark P. Waldrop, James B. Cotner, Diana R. Nemergut, Emily B. Graham, Matthew D. Wallenstein
By
Energy and Minerals Mission Area, Climate Research and Development Program, Energy Resources Program, Land Change Science Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center, John Wesley Powell Center for Analysis and Synthesis
Can treatment and disposal costs be reduced through metal recovery?
This paper describes a framework to conduct a “metal-recovery feasibility assessment” for mining influenced water (MIW) and associated treatment sludge. There are multiple considerations in such a determination, including the geologic/geochemical feasibility, market feasibility, technical feasibility, economic feasibility, and administrative feasibility. Each of these considerations needs to be ev
Authors
Kathleen S. Smith, Linda Figueroa, Geoffrey S. Plumlee
A 3400 year paleolimnological record of prehispanic human–environment interactions in the Holmul region of the southern Maya lowlands
The timing, magnitude and drivers of late Holocene environmental change in the Holmul region of the southern Maya lowlands are examined by combining paleoenvironmental and archeological data. Environmental proxy analyses on a ~ 3350 cal yr lacustrine sediment record include pollen, charcoal, loss on ignition, magnetic suscep- tibility, and elemental geochemistry. Archeological evidence is derived
Authors
David B. Wahl, Francisco Estrada-Belli, Lysanna Anderson
Guide to luminescence dating techniques and their application for paleoseismic research
Over the past 25 years, luminescence dating has become a key tool for dating sediments of interest in paleoseismic research. The data obtained from luminescence dating has been used to determine timing of fault displacement, calculate slip rates, and estimate earthquake recurrence intervals. The flexibility of luminescence is a key complement to other chronometers such as radiocarbon or cosmogenic
Authors
Harrison J. Gray, Shannon A. Mahan, Tammy M. Rittenour, Michelle Summa Nelson
Database of mineral deposits in the Islamic Republic of Mauritania (phase V, deliverables 90 and 91)
Three ore deposits databases from previous studies were evaluated and combined with new known mineral occurrences into one database, which can now be used to manage information about the known mineral occurrences of Mauritania. The Microsoft Access 2010 database opens with the list of tables and forms held within the database and a Switchboard control panel from which to easily navigate through th
Authors
Erin E. Marsh, Eric D. Anderson
Truncorotalia crassaformis from its type locality: Comparison with Caribbean plankton and Pliocene relatives
Truncorotalia crassaformis has been identified in Pliocene-Holocene assemblages globally but there has been little analysis of specimens from its type locality at Lomita Quarry, California. This has led to confusion about some diagnostic criteria, particularly the presence of a peripheral keel. To better understand variation specimens are studied from the type locality (Pleistocene, c. 400–600 ka)
Authors
George H. Scott, James C. Ingle, Brendan McCane, Charles L. Powell, Robert C. Thunell
Reconnaissance stratigraphic studies in the Susitna basin, Alaska, during the 2014 field season
The Susitna basin is a poorly-understood Cenozoic successor basin immediately north of Cook Inlet in south-central Alaska (Kirschner, 1994). The basin is bounded by the Castle Mountain fault and Cook Inlet basin on the south, the Talkeetna Mountains on the east, the Alaska Range on the north, and the Alaska–Aleutian Range on the west (fig. 2-1). The Cenozoic fill of the basin includes coal-bearing
Authors
David L. LePain, Richard G. Stanley, Nina T. Harun, Kenneth P. Helmold, Rebekah Tsigonis
Reconnaissance coal study in the Susitna basin, 2014
The Alaska Division of Geological & Geophysical Surveys (DGGS) conducted fieldwork during the summer of 2014 in the Susitna basin as part of an ongoing evaluation of the hydrocarbon potential of frontier basins, particularly those near the Railbelt region (for example, Decker and others, 2013; Gillis and others, 2013). Topical studies associated with this recent work include sedimentary facies ana
Authors
Nina T. Harun, David L. LePain, Rebekah Tsigonis, Kenneth P. Helmold, Richard G. Stanley
Magmatism, metasomatism, tectonism, and mineralization in the Humboldt Range, Pershing County, Nevada
Introduction
The Humboldt Range, Pershing County, Nevada, predominantly consists of Mesozoic igneous and sedimentary rocks that were modified several times by magmatism, metasomatism, and tectonism, and contain a variety of metallic (Ag, Au, Pb, Zn, Sb, W, Hg) and non-metallic (dumortierite, pinite, fluorite) mineral deposits (Knopf, 1924; Kerr and Jenney, 1935; Kerr, 1938; Cameron, 1939; Campbe
Authors
Peter G. Vikre
The Lepanto Cu–Au deposit, Philippines: A fossil hyperacidic volcanic lake complex
Hyperacidic lakes and associated solfatara in active volcanoes are the expression of magmatic gas expansion from source to surface. Here we show for the first time, that the vein system that comprises the ~ 2 Ma high-sulfidation, Lepanto copper–gold deposit in the Mankayan district (Philippines) was associated with a contemporary hyperacidic volcanic lake complex—possibly the first such lake recog
Authors
Byron R. Berger, Richard W. Henley, Heather A. Lowers, Michael Pribil