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Mafic and Ultramafic Xenoliths from Volcanic Rocks of the Western United States
From abstract: Mafic and ultramafic xenoliths in the Western United States are present in volcanic rocks ranging from lamprophyric to dacitic in composition and are found in every major tectonic province from the Coast ranges from California to the Great Plains. Xenoliths from 68 localities are described here, but new localities are being discovered, and much remain to be learned about their distribution with respect to the tectonic and geophysical framework of the Western United States.
Date:
1988
Creator:
Wilshire, Howard Gordon; Meyer, C. E.; Nakata, John K.; Calk, L. C.; Shervais, John W.; Nielson, J. E. et al.
Object Type:
Report
System:
The UNT Digital Library
The Role of Clays in Fixing Lithium
A report about lithium inside of clay minerals. Lithium can be present in clays as impurities, inclusions, lattice cavities, or by isomorphous substitution.
Date:
1982
Creator:
Starkey, Harry C.
Object Type:
Report
System:
The UNT Digital Library
The Shelf-Slope Transition-Canyon and Upper Slope Sedimentary Processes on the Southern Margin of Georges Bank
A report about sedimentary processes on the southern margin of Georges Bank which is based on observations from research submersibles of bottom features, on size analyses of sediment samples, and on measurements of current strength and flow direction.
Date:
1987
Creator:
Valentine, Page C.
Object Type:
Report
System:
The UNT Digital Library
Processing and Analysis of Commercial Satellite Image Data of the Nuclear Accident Near Chernobyl, U.S.S.R.
A report which presents the results of the processing and analysis of commercial satellite image data acquired over the nuclear power plant at Chernobyl in the Soviet Ukraine.
Date:
1987
Creator:
Sadowski, Frank G. & Covington, Steven J.
Object Type:
Report
System:
The UNT Digital Library
Gold in the Black Pine Mining District, Southeast Cassia County, Idaho
A report about base and precious metals in the Black Pine mining district in the Black Pine Mountains . Two different types of mineral deposits are identified.
Date:
1984
Creator:
Brady, Bruce T.
Object Type:
Report
System:
The UNT Digital Library
Cowtrack Mountain and Glass Mountain Quadrangles, California and Nevada—Analytic Data
A paper about modal and major-element chemical data on the Mesozoic plutonic rocks of the Cowtrack Mountain and Glass Mountain quadrangles are presented in tables, maps, and diagrams.
Date:
1988
Creator:
Bateman, Paul C.; Krauskopf, Konrad B. & Sheridan, Michael F.
Object Type:
Report
System:
The UNT Digital Library
Regional Thermal Metamorphism and Deformation of the Sitka Graywacke, Southern Baranof Island, Southeastern Alaska
A report about thermally metamorphosed rocks under Southern Baranof Island. It represents one of the largest regions of metamorphosed rock.
Date:
1987
Creator:
Loney, Robert A. & Brew, David A.
Object Type:
Report
System:
The UNT Digital Library
Chromite Deposits in the Seiad Valley and Scott Bar Quadrangles, Siskiyou County, California
A report about chromite deposits in the Seiad Creek and McGuffy Creek districts and the Ladd mine, Siskiyou County, California, that occur in dunite-peridotite bodies that are part of an ophiolitic sequence in the western Paleozoic and Triassic belt of the Klamath Mountains.
Date:
1981
Creator:
Cornwall, Henry R.
Object Type:
Report
System:
The UNT Digital Library
Some Middle Cenomanian (Upper Cretaceous) Acanthoceratid Ammonites from the Western Interior of the United States
Abstract: The ammonite family Acanthoceratidae de Grossouvre is represented in the Western Interior region by many genera. Species and subspecies of Calycoceras, Acanthoceras, Cunningtoniceras, Plesiacanthoceras, and Protacanthoceras are important guide fossils to narrow zones of middle Cenomanian age in southeastern Montana, northeastern Wyoming, western South Dakota, and central Kansas. In this region, the ammonite zonation through most of the middle Cenomanian seems to be, from oldest to youngest, a zone of Acanthoceras muldoonense Cobban and Scott, a zone of Acanthoceras bellense Adkins and Calycoceras leonense (Adkins), a zone of Cunningtoniceras amphibolum (Morrow) with subzones of C. amphibolum amphibolum and C. amphibolum fallense (n. subsp.), and a zone of Plesiacanthoceras wyomingense (Reagan). In this report, Acanthoceras muldoonense, A. bellense, and Calycoceras leonense are described from the northern part of the Western Interior for the first time. Cunningtoniceras amphibolum, originally assigned to Acanthoceras, is described in more detail and divided into the nominate subspecies and the new subspecies C. amphibolum fallense. The earliest whorls of Plesiacanthoceras wyomingense, previously unknown, are described as well as all the later growth stages. The small genus, Protacanthoceras, is represented by several new species and one new subspecies. Protacanthoceras fisheri is found in the zone of Acanthoceras …
Date:
1987
Creator:
Cobban, William Aubrey
Object Type:
Report
System:
The UNT Digital Library
Jurassic (Bathonian and Callovian) Ammonites in Eastern Oregon and Western Idaho
From abstract: Jurassic ammonites of late Bathonian to middle Callovian Age have been found in 12,000-13,000 feet (3,660-3,960 m) of strata exposed in the area near and south of Izee and Seneca in east-central Oregon. Ammonites of early Callovian Age and possibly also late Bathonian Age occur in several hundred feet of black shale exposed along Dennett Creek near Mineral, Idaho. Early Callovian ammonites also occur in similar black shale exposed on the Oregon side of Snake River Canyon about 32 miles (52 km) south of the northeast corner of Oregon.
Date:
1981
Creator:
Imlay, Ralph W.
Object Type:
Report
System:
The UNT Digital Library
Runoff Characteristics and Washoff Loads from Rainfall-Simulation Experiments on a Street Surface and a Native Pasture in the Denver Metropolitan Area, Colorado
Abstract: Rainfall simulation studies were conducted in conjunction with the Denver Regional Urban Runoff Program to: (1) Compare runoff quantity and quality from two different intensities of rainfall on impervious plots having identical antecedent conditions, (2) document a first flush of constituent loads in runoff from 1,000-square-foot streetsurface plots, (3) compare runoff characteristics from a street surface subjected to simulated rainfall with those from a 69-acre urban basin of mixed land use subjected to natural rainfall, (4) perform statistical analysis of constituent loads in the runoff with several independent variables, and (5) compare the quantity and quality of runoff from 400-square-foot plots of native grasses used for pasture and subjected to simulated rainfall with that from a 405-acre basin covered with native grasses used for pasture and sub-jected to natural rainfall. The rainfall simulations conducted on the street surface showed that higher intensity simulated rainfall produced a higher percentage of runoff than lower intensity rainfall. A first flush of constituent loads occurred for most constituents in the runoff from most rainfall simulations on the street surface; however, a first flush did not occur in the runoff from simulated rainfall on the pasture. The event mean concentrations of constituents in the …
Date:
1987
Creator:
Mustard, Martha H.; Ellis, Sherman R. & Gibbs, Johnnie W.
Object Type:
Report
System:
The UNT Digital Library
The Sorting and Deposition of Allochthonous Plant Material in a Modern Environment at Silwood Lake, Silwood Park, Berkshire, England
Abstract: Quantitative statistical sampling of plant debris entombed within deltaic sediments of a Holocene fluviolacustrine environment at Silwood Lake, Berkshire, demonstrates that patterns of deposition exist that can be used to reconstruct the relative spatial distributions of species within the source vegetation.
Date:
1981
Creator:
Spicer, Robert A.
Object Type:
Report
System:
The UNT Digital Library
Research in the Geysers-Clear Lake Geothermal Area, Northern California
From abstract: The Geysers-Clear Lake geothermal area lies within the central belt of the Franciscan assemblage in northern California. The structure of this terrane is characterized by northeast-dipping imbricate thrust slices that have been warped and cut by steeply dipping strike-slip and normal faults. Introduction of magma into the crust beneath the Geysers-Clear Lake area can be related to eastsoutheast extension accompanying northward propagation of the San Andreas transform system between the Clear Lake region and Cape Mendocino within the last 3 million years. The initiation of strike-slip faulting during this time terminated subduction of elements of the Farallon plate beneath North America as strike-slip motion was taken up along the Pacific-North American plate boundary. The mechanism for magma generation appears to require a heat source in the mantle that mixed mantle-derived melts with various crustal rocks. These crustal rocks may have included the Franciscan central and coastal belts, ophiolite, Great Valley sequence, and possibly middle and late Tertiary rocks subducted before initiation of strike-slip faulting.
Date:
1981
Creator:
McLaughlin, Robert J. & Donnelly-Nolan, Julie M.
Object Type:
Report
System:
The UNT Digital Library
Petroleum Geology of the Northern Part of the Arctic National Wildlife Refuge, Northeastern Alaska
The following publication presents the results of a multifaceted study of the geology of the coastal plain and adjacent areas of the Arctic National Wildlife Refuge (ANWR) of northeastern Alaska and estimates of its yet to be discovered oil and gas resources. This report provides technical geologic and assessment details not found in the congressional report on the ANWR 1002 area (Clough and others, 1987).
Date:
1987
Creator:
Bird, Kenneth J. & Magoon, Leslie B.
Object Type:
Report
System:
The UNT Digital Library
[Evolution of Sedimentary Basins--Uinta and Piceance Basins: Chapters A-C]
From introduction: The goal of this basin analysis study is to reconstruct the fluvial depositional system of the upper part of the Pennsylvanian and Permian Maroon Formation in the Eagle basin, northwest Colorado.
Date:
1987
Creator:
Johnson, Samuel Y.
Object Type:
Report
System:
The UNT Digital Library
Mineral Resources of the Mount Grafton Wilderness Study Area, Lincoln and White Pine Counties, Nevada
From abstract: The Mount Grafton Wilderness Study Area (NV- 040-169) is in a remote area of the Schell Creek Range, Nevada. In 1984 and 1985 the U.S. Geological Survey and the U.S. Bureau of Mines evaluated the identified mineral resources and mineral resource potential of approximately 30,115 acres of the study area at the request of the U.S. Bureau of Land Management. The study area contains identified low-grade resources of zinc and tungsten. The study area has a low potential for oil and gas, uranium and thorium, and geothermal and clay resources.
Date:
1987
Creator:
Van Loenen, Richard E.; Blank, H. Richard, Jr.; Barton, Harlan N. & Chatman, Mark L.
Object Type:
Report
System:
The UNT Digital Library
Mineral Resources of the Mormon Mountains Wilderness Study Area, Lincoln County, Nevada
From introduction: This report presents an evaluation of the mineral endowment (identified resources (known) and mineral resource potential (undiscovered)) of the study area and is the product of several separate studies by the USBM and the USGS.
Date:
1988
Creator:
Shawe, Daniel R.; Blank, H. Richard, Jr.; Wernicke, Brian P.; Axen, Gary J.; Barton, Harlan N.; Day, Gordon W. et al.
Object Type:
Report
System:
The UNT Digital Library
Mineral Resources of the Clover Mountains Wilderness Study Area, Lincoln County, Nevada
From abstract: At the request of the U.S. Bureau of Land Management, approximately 84,165 acres of the Clover Mountains Wilderness Study Area (NV-050-139) was evaluated for mineral resources (known) and mineral resource potential (undiscovered). In this report, the area studied is referred to as "the wilderness study area" or simply "the study area;" any reference to the Clover Mountains Wilderness Study Area refers only to that part of the wilderness study area for which a mineral survey was requested by the U.S. Bureau of Land Management. The study area is located in southern Nevada, in Lincoln County, about 90 mi northeast of Las Vegas. No identified mineral resources exist inside the study area, although gold, silver, and copper resources are found immediately to the west at the Pennsylvania mine.
Date:
1988
Creator:
Moring, Barry; Blank, H. Richard, Jr.; Hoffman, James D. & McHugh, Edward L.
Object Type:
Report
System:
The UNT Digital Library
Mineral Resources of the Fish Springs Range Wilderness Study Area, Juab County, Utah
Abstract: The Fish Springs Range Wilderness Study Area (UT-050-127) includes most of the Fish Springs Range and is located north of the House Range, about 50 miles northwest of the city of Delta, Utah. A mineral resource study of the 33,840-acre area was completed in 1987 by the U.S. Geological Survey and U.S. Bureau of Mines. The northwestern and southeastern parts of the wilderness study area contain inferred subeconomic resources of high-purity quartzite. No metallic mineral resources were identified in the study area, but more than 17 million pounds of lead, 2.6 million ounces of silver, and minor copper, zinc, and gold have been produced from the Fish Springs mining district, which is immediately outside the northwest boundary of the wilderness study area. The potential for undiscovered deposits of these metals and molybdenum is high near the northern end of the study area, adjacent to the mining district, moderate near the southern end, and low in the remainder of the area. The resource potential for undiscovered deposits of high-purity limestone and dolomite is moderate throughout the study area except where quartzite is present; potential for undiscovered low-temperature geothermal resources and for oil and gas is low throughout the study area.
Date:
1989
Creator:
Lindsey, David A.; Zimbelman, David R.; Campbell, David L.; Bisdorf, Robert J.; Duval, Joseph S.; Cook, Kenneth L. et al.
Object Type:
Report
System:
The UNT Digital Library
Mineral Resources of the Indian Creek, Bridger Jack Mesa, and Butler Wash Wilderness Study Areas, San Juan County, Utah
From abstract: The Indian Creek (UT-060-164), Bridger Jack Mesa (UT-060-167), and Butler Wash (UT-060-169) Wilderness Study Areas are located in San Juan County, southeastern Utah. Inferred subeconomic resources of sandstone and sand and gravel exist within all three wilderness study areas, but because of their abundance throughout the region, their distance from current markets, and their lack of unique properties, these materials have no current likelihood for development.
Date:
1989
Creator:
Patterson, Charles G.; Toth, Margo I. & Case, James E.
Object Type:
Report
System:
The UNT Digital Library
Mineral Resources of the Behind the Rocks Wilderness Study Area, Grand and San Juan Counties, Utah
Abstract: The Behind the Rocks Wilderness Study Area (UT-060-140A) consists of 12,635 acres in Grand and San Juan Counties, Utah. The study area has inferred subeconomic resources of potash and halite in the subsurface, and sandstone on the surface. The study area has high potential for undiscovered resources of oil and gas, low potential for undiscovered uranium, copper, vanadium, gold, silver, other metals, and geothermal energy, and unknown potential for the rare-earth mineral, braitschite. There is no resource potential for potash or halite (beyond the previously mentioned inferred resources) or for coal.
Date:
1988
Creator:
Patterson, Charles G.; Toth, Margo I. & Case, James E.
Object Type:
Report
System:
The UNT Digital Library
Mineral Resources of the Oregon Buttes Wilderness Study Area, Sweetwater County, Wyoming
This is a map of the mineral resource potential of the Oregon Buttes Wilderness Study Area, Sweetwater County, Wyoming.
Date:
1987
Creator:
Gibbons, Anthony B.; Barton, Harlan N.; Kulik, Dolores M. & Lane, Michael E.
Object Type:
Report
System:
The UNT Digital Library
Mineral resources of the Fiddler Butte (East) Wilderness Study Area, Garfield County, Utah
Map showing the mineral resource potential and the geology of the Fiddler Butte Wilderness Study Area
Date:
September 20, 1989
Creator:
Dubiel, Russell F.; Gese, Diann D.; Lee, Gregory K. & Orkild, Paul P.
Object Type:
Report
System:
The UNT Digital Library
Geologic History and Hydrocarbon Potential of Late Cretaceous-Age, Low-Permeability Reservoirs, Piceance Basin, Western Colorado
From abstract: The Piceance basin of western Colorado contains large reserves of natural gas in low-permeability reservoirs of the Late Cretaceous-age Mesaverde Formation or Mesaverde Group. The gas accumulation can be divided into three general zones: a zone of surface-water invasion that extends inward a few miles from present outcrops, a gas-and-waterbearing zone that extends 10-20 miles inward from the water-bearing zone, and a central, predominantly gasbearing zone.
Date:
1989
Creator:
Johnson, Ronald Carl
Object Type:
Report
System:
The UNT Digital Library