Hazard analysis on the Mid-Atlantic Continental Slope, DCS lease sale 59 Area
Alex P. Cardinell, Frederick R. Keer
1982, Conference Paper, Offshore Technology Conference
A multi-parameter high-resolution seismic survey covering 253 offshore lease blocks was undertaken for analysis of critical structural and depositional features and a suite of piston cores was examined for geotechnical properties on the Mid-Atlantic continental slope in the OCS Lease Sale 59 area. The analysis of this data revealed complex...
Paleoenvironment and age of kaolin deposits in the Andersonville district, Georgia
Harland E. Cofer, Norman O. Frederiksen
1982, Conference Paper, Proceedings: Second Symposium on the Geology of the Southeastern Coastal Plain
The kaolin deposits of the Andersonville district of Georgia are thick and relatively pure; they grade laterally and vertically into sandy kaolin and sand. The sedimentological and mineralogical character of the clay and the enclosing sand suggests deposition in a marine shallow-water to estuarine environment. Palynomorph and invertebrate fossil assemblages...
Geologic factors that control mineral matter in coal
C. B. Cecil, R.W. Stanton, F.T. Dulong, J.J. Renton
R.H. Filby, Brett Carpenter, Richard C. Ragaini, editor(s)
1982, Book chapter, Atomic and Nuclear Methods in Fossil Energy Research
Elements other than organically derived and bound C, H, N, O, and S constitute mineral matter in coal. Mineral matter may consist of discrete minerals such as calcite, quartz, clays, and pyrite, and/or organic compounds that contain organically bonded elements such as Ca and CI. Processes that may affect the...
The Yellowstone-Snake River Plain seismic profiling experiment: Crustal structure of the Eastern Snake River Plain
L.W. Braile, R. B. Smith, J. Ansorge, M.R. Baker, M.A. Sparlin, C. Prodehl, M.M. Schilly, J. H. Healy, Mueller, K.H. Olsen
1982, Journal of Geophysical Research B: Solid Earth (87) 2597-2609
Seismic refraction profiles recorded along the eastern Snake River Plain (ESRP) in southeastern Idaho during the 1978 Yellowstone-Snake River Plain cooperative seismic profiling experiment are interpreted to infer the crustal velocity and attenuation (Q-1) structure of the ESRP. Travel-time and synthetic seismogram modeling of a 250 km reversed refraction profile...
The sea slope problem revisited
Robert O. Castle, M.R. Elliott
1982, Journal of Geophysical Research B: Solid Earth (87) 6989-7024
Discrepancies in sea surface topography based on comparisons between the results of steric leveling and repeated geodetic levelings have identified what is known as the ‘sea slope problem.’ This problem is actually twofold: (1) the sea surface relief based on steric leveling differs significantly from that based on geodetic leveling...
Sensitivity of selected geomagnetic properties to truncation level of spherical harmonic expansions
E.R. Benton, Ronald H. Estes, R.A. Langel, L.A. Muth
1982, Geophysical Research Letters (9) 254-257
A two day selection of MAGSAT data is fit by spherical harmonic series truncated at increasing levels NF in the range 2<NF<14 to determine the extent to which the geomagnetic Gauss coefficients depend upon truncation level of the fit. The dependence is found to be concentrated in the range n<NF≲n+4...
Sedimentation, metamorphism and tectonic accretion of the Franciscan assemblage of northern California
M. Clark Blake Jr., A. S. Jayko, D. G. Howell
1982, Book chapter, Geological Society, London, Special Publications
Geologic hazards in Navarin Basin Province, Northern Bering Sea
Paul R. Carlson, Herman A. Karl, Jeffrey M. Fischer, Brian D. Edwards
1982, Conference Paper, Proceedings- Offshore Technology Conference
Navarin Basin, scheduled for leasing in 1984 (OCS sale 83), may contain vast accumulations of oil and gas. Several geologic and oceanographic processes that may be active in and around Navarin Basin province could be hazardous to commercial development. These potential hazards include submarine slides; sea-floor instability resulting from disturbance...
Marine geologic studies of the inner continental shelf off Massachusetts
C. J. O’Hara, R. N. Oldale, O.C. Farquhar
1982, Conference Paper, Geotechnology in Massachusetts
No abstract available....
Strata-bound sulfide deposits, wall-rock alteration, and associated tin-bearing minerals in the Carolina slate belt, South Carolina and Georgia
Henry Bell
1982, Economic Geology (77) 294-311
Massive sulfide deposits, gold deposits, and tin-bearing minerals occur in rocks of the Carolina slate belt in South Carolina and adjacent Georgia. The belt of greenschist metamorphic rocks in which the ore deposits occur is mostly Cambrian in age. It is divided into an upper metasedimentary unit and a lower...
The emplacement of ophiolites by collision
Zvi Ben-Avraham
1982, Journal of Geophysical Research (87) 3861-3867
Ophiolites, recognized in most of the world's orogenic belts, are generally interpreted to be oceanic crust and upper mantle (lithosphere) fragments that have been incorporated into continental margins at consuming plate boundaries. We suggest that the mechanism for ophiolite emplacement is the same in both the Alpine and Andean-type orogenes....
Source parameters of the 1980 Mammoth Lakes, California, earthquake sequence
Ralph J. Archuleta, Edward Cranswick, Charles Mueller, Paul Spudich
1982, Journal of Geophysical Research B: Solid Earth (87) 4595-4607
From the more than 1500 Mammoth Lakes earthquakes recorded on three-component digital seismographs (Spudich et al., 1981), 150 were used in an analysis of the locations, mechanism, and source parameters. A composite fault plane solution of nine earthquakes 3.9 ≤ M ≤ 5.1 defines a right-lateral strike slip mechanism on...
Diatom biostratigraphy and paleoecology of the type section of the Luisian Stage, central California
Jack G. Baldauf, John A. Barron
1982, Micropaleontology (28) 84
Diatoms from the type section of the Luisian Stage in central California correlate with the lowermost part of the Denticulopsis lauta Zone through the lower part of subzone "a" of the Denticulopsis hustedtii-D. lauta Zone and are early Middle Miocene in age (about 6.0 to 14.0 Ma), Rocks assigned to...
Northern East Pacific Rise: Magnetic anomaly and bathymetric framework
Kim D. Klitgord, Jacqueline Mammerickx
1982, Journal of Geophysical Research B: Solid Earth (87) 6725-6750
The oceanic crust in the eastern Pacific between 7°N and 30°N and east of 127°W contains a fairly complete history of the spreading centers associated with the East Pacific Rise since 25 m.y. B.P. (late Oligocene). In this paper, we have summarized the seafloor spreading magnetic-anomaly data and the bathymetric...
United States gold resource profile; reply
Simon M. Cargill
1982, Economic Geology (77) 1244-1247
No abstract available...
The Geoid: Effect of compensated topography and uncompensated oceanic trenches
C.G. Chase, Marcia K. McNutt
1982, Geophysical Research Letters (9) 29-32
The geoid is becoming increasingly important in interpretation of global tectonics. Most of the topography of the earth is isostatically compensated, so removal of its effect from the geoid is appropriate before tectonic modeling. The oceanic trenches, however, are dynamically depressed features and cannot be isostatically compensated in the classical...
Volume of organic-rich Devonian shale in the Appalachian Basin: relating "black" to organic-matter content: Geologic notes
Ronald R. Charpentier, James W. Schmoker
1982, American Association of Petroleum Geologists Bulletin (66) 375-378
Some estimates of natural-gas resources in the Devonian shale of the Appalachian basin depend on the volume of organic-rich shale in the basin. A map by L. G. Wallace and W. de Witt showing the thickness and extent of Devonian "black" shale facies in the Appalachian basin is widely used...
Regional ground-water flow concepts in the United States: Historical perspective
J.D. Bredehoeft, W. Back, B.B. Hanshaw
1982, Special Paper of the Geological Society of America (189) 295-316
A number of important ideas, developed during the past 100 years, form the framework of the present understanding of regional ground-water flow. The most important of these ideas are:Differences in topographic elevation provide the principal driving force for regional flow.Flow through confining layers...
On the distribution of species occurrence
Martin A. Buzas, Carl F. Koch, Stephen J. Culver, Norman F. Sohl
1982, Paleobiology (8) 143-150
The distribution of species abundance (number of individuals per species) is well documented. The distribution of species occurrence (number of localities per species), however, has received little attention. This study investigates the distribution of species occurrence for five large data sets. For modern benthic foraminifera, species occurrence is examined from...
The Georges Bank monitoring program: analysis of trace metals in bottom sediments
Michael H. Bothner
1982, Report
No abstract available....
Iridium abundance measurements across the Cretaceous/Tertiary boundary in the San Juan and Raton Basins of northern New Mexico
C. J. Orth, J. S. Gilmore, J.D. Knight, R.H. Tschudy, C. L. Pillmore, James E. Fassett
1982, GSA Special Papers (190) 423-433
During the past year we have been measuring trace element abundances and searching for anomalously high iridium (Ir) concentrations in continental sedimentary rocks that span the Cretaceous-Tertiary boundary in the Raton and San Juan Basins of northern New Mexico and southern Colorado. Using neutron activation and radiochemical separations, we have...
Observations of strain accumulation across the San Andreas fault near Palmdale, California, with a two-color geodimeter
J. O. Langbein, Mark F. Linker, Art McGarr, L.E. Slater
1982, Science (218) 1217-1219
Two-color laser ranging measurements during a 15-month period over a geodetic network spanning the San Andreas fault near Palmdale, California, indicate that the crust expands and contracts aseismically in episodes as short as 2 weeks. Shear strain parallel to the fault has accumulated monotonically since November 1980,...
Triggering of large earthquakes by magma-chamber inflation, Izu Peninsula (Japan)
Wayne R. Thatcher, James C. Savage
1982, Geology (10) 637-640
A close spatial and temporal association between three aseismic uplift episodes and subsequent large (M ≈ 7) earthquakes on the Izu Peninsula, Japan, suggests a causal relation. Quaternary geology, as well as studies by other workers, indicates a volcanic origin for the observed uplift, and we use a simple inflation...
Uranium in spring water and bryophytes at basin creek in central idaho
H.T. Shacklette, J. A. Erdman
1982, Journal of Geochemical Exploration (17) 221-236
Arkosic sandstones and conglomerates of Tertiary age beneath the Challis Volcanics of Eocene age at Basin Creek, 10 km northeast of Stanley, Idaho, contain uranium-bearing vitrainized carbon fragments. The economic potential of these sandstones and conglomerates is currently being assessed. Springs abound at the contacts of rock units, and water...
Subsurface valleys and geoarcheology of the eastern Sahara revealed by shuttle radar
J.F. McCauley, G. G. Schaber, C. S. Breed, M. J. Grolier, C.V. Haynes, B. Issawi, C. Elachi, R. Blom
1982, Science (218) 1004-1020
The shuttle imaging radar (SIR-A) carried on the space shuttle Columbia in November 1981 penetrated the extremely dry Selima Sand Sheet, dunes, and drift sand of the eastern Sahara, revealing previously unknown buried valleys, geologic structures, and possible Stone Age occupation sites. Radar responses from bedrock and...
