Accumulation rates of Th-230, Pa-231, and some transition metals on the Bermuda Rise
M.P. Bacon, J.N. Rosholt
1982, Geochimica et Cosmochimica Acta (46) 651-666
Measurements of 238U, 234U, 230Th, 232Th, 231Pa, Mn, Fe, Co, Ni, Cu, and Zn were made on 23 samples from core GPC-5, a 29-m giant piston core from a water depth of 4583 m on the northeastern Bermuda Rise (33°41.2′N, 57°36.9′W). This area is characterized by rapid deposition of sediment transported by abyssal currents. Unsupported 230Th...
Laboratory measurements of reservoir rock from the Geysers geothermal field, California
D.A. Lockner, R. Summers, D. Moore, J.D. Byerlee
1982, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (19) 65-80
Rock samples taken from two outcrops, as well as rare cores from three well bores at the Geysers geothermal field, California, were tested at temperatures and pressures similar to those found in the geothermal field. Both intact and 30?? sawcut cylinders were deformed at confining pressures of 200-1000 bars, pore...
Geochemical indices of fine sediment transport, northwest Gulf of Mexico
C. W. Holmes
1982, Journal of Sedimentary Petrology (52) 307-321
The 210 Pb distribution, the clay mineralogy distribution, and the distribution of three trace metals, barium, lead, and manganese, in the sediments of the south Texas shelf are related to the dynamics of the sedimentary transport process. 210 Pb, whose concentration is time dependent, defines three loci...
Late Pleistocene- Holocene transgressive sedimentation in deltaic and non-deltaic areas of the northeastern Bering epicontinental shelf.
C.H. Nelson
1982, Geologie en Mijnbouw (61) 5-18
The distribution of late Pleistocene and Holocene surface sediments on the northern Bering Seafloor is patchy and dependent upon locations of seafloor bedrock and pre-late Pleistocene glacial debris, late Holocene river sediment influx, and modern strong bottom currents. Seafloor vibracores and high-resolution profiles record two different sedimentary environments in the...
Interfingering of the Frontier Formation and Aspen Shale, Cumberland Gap, Wyoming.
J. M'gonigle
1982, Mountain Geologist (19) 59-61
The basal part, or the Chalk Creek Member, of the non-marine lower Frontier Formation (Upper Cretaceous) includes a thin coal bed that grades S into a carbonaceous shale. The latter plus associated sandstones and shales pinch out S of Cumberland Gap and lie stratigraphically below the top of the Aspen...
Computation with physical values from Landsat digital data
C.J. Robinove
1982, Photogrammetric Engineering and Remote Sensing (48) 781-784
Landsat digital images are commonly analyzed by using the digital numbers for each pixel recorded on a computer-compatible magnetic tape. Although this procedure may be satisfactory when only a single, internally consistent image is used, the procedure may produce incorrect results if more than one image is used for analysis...
The modified polyconic projection for the IMW
John P. Snyder
1982, Cartographica: The International Journal for Geographic Information and Geovisualization (19) 31-43
The modified Polyconic map projection designed by Lallemand and adopted for the International Map of the World between 1909 and 1962 has two meridians and two parallels which are true to scale. Constructed geometrically in the past, forward and inverse coordinate transformations may be calculated analytically in order to transfer...
Geology of continental shelf, Onslow Bay, North Carolina, as revealed by submarine outcrops
Blake W. Blackwelder, Ian G. Macintyre, Orrin H. Pilkey
1982, American Association of Petroleum Geologists Bulletin (66) 44-56
Lithologic and stratigraphic data from rocks dredged from the continental shelf off Onslow Bay, North Carolina, provide surface control for seismic studies of the southeastern United States continental margin and help to explain the distribution of potentially economic phosphate-rich sediments on this shelf. Outcropping Miocene rocks in this area indicate...
Simulations of seabird damage and recovery from oilspills in the northern Gulf of Alaska.
W.B. Samuels, K.J. Lanfear
1982, Journal of Environmental Management (15) 169-182
If an oilspill contacts a colony of glaucous-winged gulls Larus hyperboreus, reducing the population by 50%, the population is expected to recover to its pre-spill level in c.20 yr. For common murres Uria aalge, this same situation yields a recovery time of c.70 yr. Assuming that oil is found in...
Geotechnical characteristics of bottom sediments in the northeastern Bering Sea.
H. W. Olsen, E.C. Clukey, C.H. Nelson
1982, Geologie en Mijnbouw (61) 91-103
Sediment of Holocene age derived from the Yukon River, consisting dominantly of silty fine sand and sandy silt, covers the bottom of central and western Norton Sound, which is a high energy environment involving extensive ice loading, high waves, and strong bottom currents. The sediment characteristics indicate that it is...
The oxygen isotope composition of granitoid and sedimentary rocks of the southern Snake Range, Nevada
D. E. Lee, I. Friedman, J.D. Gleason
1982, Contributions to Mineralogy and Petrology (79) 150-158
Six diverse intrusive igneous types are exposed as discrete outcrops within an area of 900 km2 in the southern Snake Range, White Pine County, Nevada. The previously recognized variety among these igneous types is reflected in the wide range of ??18O values (-1.1 to 13.4 permil) found in these rocks....
Stolzite from Tsumeb.
E.E. Foord, N. M. Conklin
1982, Mineralogical Record (13) 149-150
The world's largest known crystal of stolzite (1.3 X 1.3 X 2.5 cm) is described. It is associated with tennantite and quartz, and is from the Tsumeb mine, Tsumeb, Namibia. Forms present include (001), (111), (101), (122), and (212). Spectrographic analyses indicate a nearly end-member composition with Mo, Fe, Ba,...
Applications of Landsat imagery to problems of petroleum exploration in Qaidam Basin, China
G. B. Bailey, P. D. Anderson
1982, American Association of Petroleum Geologists Bulletin (66) 1348-1354
Tertiary and Quaternary nonmarine, petroleum-bearing sedimentary rocks in the Qaidam basin of remote western China have been extensively deformed by compressive forces. These forces created many folds which are current targets of Chinese exploration programs. Manual techniques of image analysis and interpretation were applied to computer-enhanced Landsat images of the...
Dwornikite, (Ni,Fe)SO4 · H2O, a member of the kieserite group from Minasragra, Peru
Charles Milton, Howard T. Evans Jr., Robert G. Johnson
1982, Mineralogical Magazine (46) 351-355
Dwornikite, (Ni1−xFex)SO4 · H2O is a member of the kieserite group, monoclinic with space group C2/c. Specimens from Minasragra, Peru with x ∼ 0.1 have a unit cell with a = 6.839(2), b = 7.582(2), c = 7.474(2) Å, and β = 117.85(2)°. The six strongest lines of the...
Fission-track ages of late Cenozoic distal tephra beds in the Yukon Territory and Alaska
N. D. Naeser, J.A. Westgate, O.L. Hughes, T. L. Pewe
1982, Canadian Journal of Earth Sciences (19) 2167-2178
Six distal tephra beds from the Yukon Territory and Alaska have been dated by the fission-track method. Zircon and glass ages were determined for the Fort Selkirk and Lost Chicken tephra beds, but only glass ages for the others.Assuming that no track fading has occurred in the glass, Old Crow...
Pingos in the Brooks Range, northern Alaska, U.S.A.
T. D. Hamilton, Curtis M. Obi
1982, Arctic and Alpine Research (14) 13-20
Some 70 pingos occur at 27 separate localities within and near the Brooks Range. The pingos are distributed through mountain valleys at altitudes up to 725 m and in terrain glaciated as recently as late Wisconsinan time. Most are open-system forms; possible closed-system pingos are present at only a single...
The chemical and isotopic record of rock-water interaction in the Sherman Granite, Wyoming and Colorado
R. A. Zielinski, Z. E. Peterman, J. S. Stuckless, J.N. Rosholt, Ignatius T. Nkomo
1982, Contributions to Mineralogy and Petrology (78) 209-219
Chemical, isotopic, radiographic, and rock-leaching data are combined to describe the effects of rock-water interactions in core samples of petrographically fresh, 1.43 b.y.-old Sherman Granite. The data serve to identify sensitive indicators of incipient alteration and to estimate the degree, pathways, and timing of element mobilization. Unfractured core samples of...
Ferromagnetic and superparamagnetic contamination in pulverized coal
F. E. Senftle, A. N. Thorpe, C.C. Alexander, R. B. Finkelman
1982, Fuel (61) 81-86
Although no significant major-element contamination is introduced by grinding coal in a steel pulverizer, abraded steel particles can conceivably affect the magnetic properties of pulverized coal. Magnetic and scanning-electron-microscope analyses of pulverized coal and coal fragments from the Herrin No. 6 seam in Illinois showed ferromagnetic and superparamagnetic contamination from...
Wilmington Submarine Canyon: A marine fluvial-like system
B. McGregor, W.L. Stubblefield, William B. F. Ryan, D.C. Twichell
1982, Geology (10) 27-30
Midrange sidescan sonar data (swath width = 5 km) show that a system of gullies and small channels feeds into large submarine canyons on the Middle Atlantic Continental Slope of the United States. The surveyed canyons all have relatively flat floors, but they...
Preliminary model of regional Mesozoic groundwater flow and uranium deposition in the Colorado Plateau.
R.F. Sanford
1982, Geology (10) 348-352
Qualitative and numerical simulation of regional groundwater flow in the Colorado Plateau during Late Jurassic and Early Cretaceous time has led to a model of U deposition in areas of upwelling solutions. Palaeographic reconstruction shows that surface drainage and groundwater flow was generally to the NE and E. Groundwater flowing...
Sediment deposition in a flood retention structure after two record floods in southwestern Wisconsin.
P.A. Kammerer Jr., W. G. Batten
1982, Journal of Soil and Water Conservation (37) 302-304
Sediment deposited in a flood-control structure was measured after record floods in SW Wisconsin on June 17 and June 30-July 1, 1978. The structure is in the Driftless Area, where high relief, erodible soils, and land use contribute to high soil losses. The two floods deposited 4.1 acre-ft of sediment...
Ice rafting of fine-grained sediment, a sorting and transport mechanism, Beaufort Sea, Alaska
P. W. Barnes, E. Reimnitz, D. Fox
1982, Journal of Sedimentary Petrology (52) 493-502
The presence of turbid, sediment-rich fast ice in the Arctic is a major factor affecting transport of fine-grained sediment. Turbid ice was found to be present in a zone 10 to 20 km wide along the coast of the Beaufort Sea. Sediment concentrations...
Geochemistry of a Pliocene-Pleistocene oceanic-arc plutonic complex, Guadalcanal
A.R. Chivas, A.S. Andrew, A.K. Sinha, J. R. O’Neil
1982, Nature (300) 139-143
The Koloula Igneous Complex, on the island of Guadalcanal, consists of a low-K calc-alkaline sequence of 26 different intrusive phases. The major intrusions are characterized by K/Rb>400, Rb/Sr<0.06, ?? 18O of 5.7 to 7.2 and uniform 87Sr/86Sr of 0.70372. This article presents the first data describing oxygen and strontium isotopic...
Aminostratigraphy and faunal correlations of late Quaternary marine terraces, Pacific Coast, USA
G. L. Kennedy, K. R. Lajoie, J.F. Wehmiller
1982, Nature (299) 545-547
Recent studies using the extent of racemization of amino acids to date fossil mollusc shells in the Arctic1, the British Isles2 and on the Atlantic3,4 and Pacific5-13 coasts of North America have relied mainly on theoretical kinetic models of racemization. Ages generated in this fashion are highly model dependent and...
Mixed-layer kerolite/stevensite from the Amargosa Desert, Nevada
Dennis D. Eberl, Blair F. Jones, Hani N. Khoury
1982, Clays and Clay Minerals (30) 321-326
Mixed-layer clays composed of randomly interstratified kerolite/stevensite occur as lake and/or spring deposits of probable Pliocene and Pleistocene age in the Amargosa Desert of southern Nevada, U.S.A. The percentage of expandable layers of these clays, determined from computer-simulated X-ray diffractograms, ranges from almost 0 to about 80%. This range in...
