Publications
Listed below are publication products directly associated with the Geology, Energy & Minerals Science Center:
Filter Total Items: 1240
An 800,000-year pollen record from Owens Lake, California: Preliminary analyses An 800,000-year pollen record from Owens Lake, California: Preliminary analyses
A long sequence of fossil palynomorph assemblages from a 323-m-long core taken at Owens Lake has enabled us to evaluate the gross vegetational trends for the Owens Valley region of California over the past ~800,000 years. Shifts in vegetation composition and abundance in the study area during the Pleistocene were indicated in core sediments by marked fluctuations in the pollen...
Authors
Ronald J. Litwin, D.P. Adam, N. O. Frederiksen, W. B. Woolfenden
The Spruce Head composite pluton: An example of mafic to silicic Salinian magmatism in coastal Maine, northern Appalachians The Spruce Head composite pluton: An example of mafic to silicic Salinian magmatism in coastal Maine, northern Appalachians
No abstract available.
Authors
Robert A. Ayuso, Joseph G. Arth
A science-based, watershed strategy to support effective remediation of abandoned mine lands A science-based, watershed strategy to support effective remediation of abandoned mine lands
A U.S. Geological Survey Abandoned Mine Lands Initiative will develop a strategy for gathering and communicating the scientific information needed to formulate effective and cost-efficient remediation of abandoned mine lands. A watershed approach will identify, characterize, and remediate contaminated sites that have the most profound effect on water and ecosystem quality within a...
Authors
Herbert T. Buxton, David A. Nimick, Paul Von Guerard, Stan E. Church, Ann G. Frazier, John R. Gray, Bruce R. Lipin, Sherman P. Marsh, Daniel F. Woodward, Briant A. Kimball, Susan E. Finger, Lee S. Ischinger, John C. Fordham, Martha S. Power, Christine M. Bunch, John Jones
Multiphase groundwater flow near cooling plutons Multiphase groundwater flow near cooling plutons
We investigate groundwater flow near cooling plutons with a computer program that can model multiphase flow, temperatures up to 1200°C, thermal pressurization, and temperature‐dependent rock properties. A series of experiments examines the effects of host‐rock permeability, size and depth of pluton emplacement, single versus multiple intrusions, the influence of a caprock, and the impact...
Authors
Daniel O. Hayba, Steven E. Ingebritsen
Digital geologic map and mineral deposits of the Lake Superior region: Minnesota, Wisconsin, Michigan Digital geologic map and mineral deposits of the Lake Superior region: Minnesota, Wisconsin, Michigan
No abstract available.
Authors
W.F. Cannon, T. H. Kress, D. M. Sutphin, G. B. Morey, Joyce Meints
Digital geologic and geophysical data of Bangladesh Digital geologic and geophysical data of Bangladesh
This CD-ROM was compiled according to the methodology developed by the U.S. Geological Survey's World Energy Project. The goal of the project was to assess the undiscovered, technically recoverable oil and gas resources of the world and report these results by the year 2000. A worldwide series of geologic maps, published on CD-ROMs, was released by the U.S. Geological Survey's World...
Long-term implications of new gas estimates Long-term implications of new gas estimates
No abstract available.
Authors
Emil D. Attanasi, J. W. Schmoker
Environment of ore deposition in the creede mining district, San Juan Mountains, Colorado: Part V. Epithermal mineralization from fluid mixing in the OH vein Environment of ore deposition in the creede mining district, San Juan Mountains, Colorado: Part V. Epithermal mineralization from fluid mixing in the OH vein
Detailed fluid inclusion studies on coarse-grained sphalerite from the OH vein, Creede, Colorado, have shown that the abrupt color changes between growth zones correspond to abrupt changes in the nature of the ore fluids. Within each growth zone, however, the composition of the fluids remained constant. The base of a distinctive orange-brown growth zone marks a sharp increase in both...
Authors
D.O. Hayba
Alkali-deficient tourmaline from the Sullivan Pb-Zn-Ag deposit, British Columbia Alkali-deficient tourmaline from the Sullivan Pb-Zn-Ag deposit, British Columbia
Alkali-deficient tourmalines are found in albitized rocks from the hanging-wall of the Sullivan Pb-Zn-Ag deposit (British Columbia, Canada). They approximate the Mg-equivalent of foitite with an idealized formula □(Mg2Al)Al6Si6O18(BO3)3(OH)4. Major chemical substitutions in the tourmalines are the alkali-defect type [Na*(x) + Mg*(Y) = □(x) + Al(Y)] and the uvite type [Na*(x) + Al(Y) = Ca...
Authors
Shao-Yong Jiang, John F. Slack, Martin R. Palmer
Evidence of Pliocene Nothofagus in Antarctica from Pliocene marine sedimentary deposits (DSDP Site 274) Evidence of Pliocene Nothofagus in Antarctica from Pliocene marine sedimentary deposits (DSDP Site 274)
Microfossil assemblages in Pliocene sediments from DSDP Site 274 (68 °59.81′S, 173 °25.64′E) provide data on the age of the sediments and suggest the presence of Nothofagus (southern beech) in Antarctica during the Pliocene. A suite of 17 samples was collected in an interval from Samples 28-274-6R-1, 83–87 cm to 28-274-11R-4, 73–77 cm (48.33–100.29 mbsf). Bio-stratigraphic study of the...
Authors
R. Farley Fleming, John A. Barron
Pb and O isotopic constraints on the source of granitic rocks from Cape Breton Island, Nova Scotia, Canada Pb and O isotopic constraints on the source of granitic rocks from Cape Breton Island, Nova Scotia, Canada
Pb isotopic compositions of leached feldspars from twenty-three plutons in Cape Breton Island can be divided into two groups: anorthosite, syenite, and granite in the Blair River Complex, which have the least radiogenic compositions on the Island, and granitic rocks from terranes (Aspy, Bras d'Or, and Mira) to the south. Pb isotopic data for the Blair River Complex (206Pb/204Pb = 17.399...
Authors
Robert A. Ayuso, S. M. Barr, Frederick J. Longstaffe
Mineral resource assessment of the Custer National Forest in the Pryor Mountains, Carbon County, south-central Montana Mineral resource assessment of the Custer National Forest in the Pryor Mountains, Carbon County, south-central Montana
No abstract available.
Authors
B. S. Van Gosen, A.B. Wilson, J. M. Hammarstrom, D. M. Kulik