Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2524
The potential response of eolian sands to greenhouse warming and precipitation reduction on the Great Plains of the U.S.A. The potential response of eolian sands to greenhouse warming and precipitation reduction on the Great Plains of the U.S.A.
Sand dunes and sand sheets are extensive on the semi-arid GreatPlains but are at present stabilized by a sparse vegetation cover. Use of a dune mobility index, which incorporates wind strength and the ratio of mean annual precipitation to potential evapotranspiration, shows that under predicted greenhouse climate effects of increased temperature and reduced precipitation, sand dunes and...
Authors
D.R. Muhs, P.B. Maat
Development of grade and tonnage models for different deposit types Development of grade and tonnage models for different deposit types
No abstract available.
Authors
Donald A. Singer
Spatial and temporal analysis of precious-metal deposit models for a mineral resource assessment of Nevada Spatial and temporal analysis of precious-metal deposit models for a mineral resource assessment of Nevada
No abstract available.
Authors
Steve Ludington, D. P. Cox, M.G. Sherlock, Donald A. Singer, Byron R. Berger, Joseph V. Tingley
The nature of mineral deposits and the development and use of deposit models The nature of mineral deposits and the development and use of deposit models
No abstract available.
Authors
Donald A. Singer, Dennis P. Cox
Development of 3-D lithostratigraphic and confidence models at Yucca Mountain, Nevada Development of 3-D lithostratigraphic and confidence models at Yucca Mountain, Nevada
Computerized three-dimensional geologic models of potential high-level nuclear waste repositories such as Yucca Moutain, Nevada, are important for visualizing the complex interplay of (1) thickness and facies variations in lithostratigraphic units and (2) the disruption of these units by faults. The concept of a 'model of confidence' in the lithostratigraphic model is introduced to show...
Authors
D.C. Buesch, J.E. Nelson, R. P. Dickerson, R.W. Spengler
National Earthquake Hazards Reduction Program, summaries of technical reports; volume XXXIV National Earthquake Hazards Reduction Program, summaries of technical reports; volume XXXIV
No abstract available.
Authors
Muriel L. Jacobson
Understanding our fragile environment; Lessons from geochemical studies Understanding our fragile environment; Lessons from geochemical studies
An understanding of our fragile environment can begin with a recognition of the importance of certain elements, commonly called "minerals substances" (such as iron and zinc), in the lives of humans and animals and in the soils that support plants. This recognition is well deserved because these elements are essential for the life or optimum health of an organism. Some elements such as...
Authors
Larry P. Gough, Sigrid Asher-Bolinder, Laurie S. Balistrieri, George N. Breit, Thomas J. Casadevall, James G. Crock, Kimberley I. Cunningham, Joseph S. Duval, James A. Erdman, Barbara M. Erickson, Walter H. Ficklin, Larry L. Jackson, Rama K. Kotra, Joel S. Leventhal, James M. McNeal, William R. Miller, James K. Otton, Douglass E. Owen, Geoffrey S. Plumlee, G. Michael Reimer, Ronald C. Severson, Kathleen S. Smith, Ronald R. Tidball, Robert A. Zielinski
Bristol Lake basin--a deep sedimentary basin along the Bristol-Danby trough, Mojave Desert Bristol Lake basin--a deep sedimentary basin along the Bristol-Danby trough, Mojave Desert
No abstract available.
Authors
R.C. Jachens, Keith A. Howard
Kinematic evidence for extensional unroofing of the Franciscan Complex along the Coast Range Fault, Northern Diablo Range, California Kinematic evidence for extensional unroofing of the Franciscan Complex along the Coast Range Fault, Northern Diablo Range, California
Franciscan metagraywacke immediately below the Del Puerto ophiolite, an outlier of the Coast Range ophiolite in the northern Diablo Range, was sheared during top‐to‐the‐east displacement on the Coast Range fault. This represents normal faulting and extensional offset. It was accompanied by attenuation of the Coast Range ophiolite and Great Valley sequence in the hanging wall along layer...
Authors
T.A. Harms, A. S. Jayko, M. Clark Blake
530 Ma zircon age for ophiolite from the New England orogen: Oldest rocks known from eastern Australia 530 Ma zircon age for ophiolite from the New England orogen: Oldest rocks known from eastern Australia
New ion microprobe data provide constraints on the timing of formation of ophiolitic rocks in the New England tectonic collage in eastern Australia. Results for analyses of magmatic zircons from plagiogranite of the Weraerai terrane ophiolite at Upper Bingara give a 206pb/238|j ag e Qf 53Q ± 6 Ma (2a). This plagiogranite is the oldest rock from eastern Australia yet identified. Existing...
Authors
J.C. Aitchinson, T. R. Ireland, M. Clark Blake, P.G. Flood
Pliocene paleoclimatic interpretation of DSDP Site 580 (NW Pacific) using diatoms Pliocene paleoclimatic interpretation of DSDP Site 580 (NW Pacific) using diatoms
High-resolution quantitative diatom data are tabulated for the early part of the late Pliocene (3.25 to 2.08 Ma) at DSDP Site 580 in the northwestern Pacific. Sample spacing averages 11 k.y. between 3.1 and 2.8 Ma, but increases to 14 to 19 k.y. prior to 3.1 Ma and after 2.8 Ma.Q-mode factor analysis of the middle Pliocene assemblage reveals four factors which explain 92.4% of the total...
Authors
John A. Barron