Origin and evolution of the Nakhla meteorite inferred from the Sm-Nd and U-Pb systematics and REE, Ba, Sr, Rb and K abundances
N. Nakamura, D.M. Unruh, M. Tatsumoto, R. Hutchison
1982, Geochimica et Cosmochimica Acta (46) 1555-1573
Analyses of Sm-Nd and U-Th-Pb systematics, REE, Ba, Sr, Rb and K concentrations were carried out for whole rock and mineral separates from the Nakhla meteorite. The 1.26 ±.07 b.y. Sm-Nd age obtained in this work is in good agreement with those previously obtained by the Rb-Sr and Ar-Ar methods. The...
The 57Fe Mössbauer parameters of pyrite and marcasite with different provenances
B.J. Evans, R. G. Johnson, F. E. Senftle, C. B. Cecil, F. Dulong
1982, Geochimica et Cosmochimica Acta (46) 761-775
Eighteen pyrite and twelve marcasite samples which have different provenances have been investigated to determine the systematics of the influence of mineralogical and geological factors on the 57Fe Mössbauer spectra at 298 K. The following results have been obtained: there is no ambiguity in distinguishing single phase pyrite from single...
Evolution of geothermal fluids deduced from chemistry plots: Yellowstone National Park (U.S.A.)
E. Mazor, J. M. Thompson
1982, Journal of Volcanology and Geothermal Research (12) 351-360
Large amounts of chemical data, obtained in geothermal fields, may readily be sorted-out by the aid of a simple set of graphs that provide a clear over-all picture and facilitate the understanding of geochemical processes taking place. As a case study, data from several hundred samples of the thermal springs...
Nuclear magnetic resonance studies of ancient buried wood-II. Observations on the origin of coal from lignite to bituminous coal
Patrick G. Hatcher, Irving A. Breger, Nikolaus Szeverenyi, G.E. Maciel
1982, Organic Geochemistry (4) 9-18
Coalified logs ranging in age from Late Pennsylvania to Miocene and in rank from lignite B to bituminous coal were analyzed by 13C nuclear magnetic resonance (NMR) utilizing the cross-polarization, magic-angle spinning technique, as well as by infrared spectroscopy. The results of this study indicate that at least three major...
Optimal dynamic management of groundwater pollutant sources
Steven M. Gorelick, Irwin Remson
1982, Water Resources Research (18) 71-76
The linear programing-superposition method is presented for managing multiple sources of groundwater pollution over time. The method uses any linear solute transport simulation model to generate a unit source-concentration response matrix that is incorporated into a management model. This series of constraints indicates local solute concentration histories that will result...
Chemistry and isotope ratios of sulfur in basalts and volcanic gases at Kilauea volcano, Hawaii
H. Sakai, T. J. Casadevall, J.G. Moore
1982, Geochimica et Cosmochimica Acta (46) 729-738
Eighteen basalts and some volcanic gases from the submarine and subaerial parts of Kilauea volcano were analyzed for the concentration and isotope ratios of sulfur. By means of a newly developed technique, sulfide and sulfate sulfur in the basalts were separately but simultaneously determined. The submarine basalt has 700 ±...
Siderite concretions: indicators of early diagenesis in the Gammon shale (Cretaceous).
D. L. Gautier
1982, Journal of Sedimentary Petrology (52) 859-871
The Gammon member of the Pierre shale of the northern Great Plains, USA, contains abundant siderite concretions. The relative depth and time of siderite precipitation can be inferred from the structure, mineralogy and isotopic composition of these concretions. Concretions that formed at shallow depths, early in the history of the...
Environmental implications of test-to-substrate attachment among some modern sublittoral foraminifera
C. Wylie Poag
1982, Geological Society of America Bulletin (93) 252-268
Topographic highs on the outer continental shelf of New Jersey are sites for the concentration of three species of attached calcareous benthic foraminifera. Elphidium subarcticum Cushman, normally considered a vagrant species, cements itself by an organic film to one or more quartz grains. Webbinella concave (Williamson) attaches to quartz grains...
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...
Velocity and bottom-stress measurements in the bottom boundary layer, outer Norton Sound, Alaska.
D.A. Cacchione, D.E. Drake, P. Wiberg
1982, Geologie en Mijnbouw (61) 71-78
We have used long-term measurements of near-bottom velocities at four heights above the sea floor in Norton Sound, Alaska, to compute hourly values of shear velocity u., roughness and bottom-drag coefficient. Maximum sediment resuspension and transport, predicted for periods when the computed value of u. exceeds a critical level, occur...
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,...
Palladium, platinum, rhodium, iridium and ruthenium in chromite- rich rocks from the Samail ophiolite, Oman.
N.J. Page, J.S. Pallister, M.A. Brown, J.D. Smewing, J. Haffty
1982, Canadian Mineralogist (20) 537-548
30 samples of chromitite and chromite-rich rocks from two stratigraphic sections, 250 km apart, through the basal ultramafic member of the Samail ophiolite were spectrographically analysed for platinum-group elements (PGE) and for Co, Cu, Ni and V. These data are reported as are Cr/(Cr + Al), Mg/(Mg + Fe) and...
Stability of βMnOOH and manganese oxide deposition from springwater
J.D. Hem, C. E. Roberson, Reba B. Fournier
1982, Water Resources Research (18) 563-570
Beta MnOOH is precipitated preferentially (with respect to Mn3O4) at temperatures near O°C when Mn2+ is oxidized in aerated aqueous solutions. Upon aging in solutions open to the atmosphere a slurry of βMnOOH tends to disproportionate to form MnO2 and Mn2+. In such aged solutions, Mn2+ and H+ activities can be constant, and both...
Biostratigraphy and structural setting of the Permian Coyote Butte Formation of central Oregon
B. R. Wardlaw, M.K. Nestell, J.T. Dutro Jr.
1982, Geology (10) 13-16
Larger isolated outcrops of the limestones of the Coyote Butte Formation consistently contain younger over older faunas that range through most of the Leonardian Series of the Early Permian. The outcrops of the Coyote Butte Formation are interpreted as right-side up blocks probably...
A note on the Goodman Jack
H.S. Swolfs, J.D. Kibler
1982, Rock Mechanics Felsmechanik Mecanique des Roches (15) 57-66
A Note on the Goodman Jack. Reconnaissance experiments, performed to evaluate the practical utility of the hard-rock variety of the Goodman Jack 1, reveal that the Hustrulid-T* correction adequately reconciles the discrepancy between the measured and true deformation modulus of the rock mass in the range of 30 to50 gigapascals....
Storage, migration, and eruption of magma at Kilauea volcano, Hawaii, 1971-1972
W. A. Duffield, R.L. Christiansen, R. Y. Koyanagi, D. W. Peterson
1982, Journal of Volcanology and Geothermal Research (13) 273-307
The magmatic plumbing system of Kilauea Volcano consists of a broad region of magma generation in the upper mantle, a steeply inclined zone through which magma rises to an intravolcano reservoir located about 2 to 6 km beneath the summit of the volcano, and a network of conduits that carry...
Periodic climate change on Mars: Review of evidence and effects on distribution of volatiles
M. H. Carr
1982, Icarus (50) 129-139
The polar regions of Mars preserve, in both their layering and their topography, a record of recent climate changes. Because of the coincidence of the growth of the northern seasonal cap with global dust storms, dust may be currently accumulating on...
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...
Unroofing history of a suture zone in the Himalaya of Pakistan by means of fission-track annealing ages
P.K. Zeitler, R.A.K. Tahirkheli, C. W. Naeser, N.M. Johnson
1982, Earth and Planetary Science Letters (57) 227-240
The uplift history of the Swat Valley and Hazara region of northwestern Pakistan has been established using 22 fission-track dates on apatite, zircon and sphene. A major fault, the Main Mantle Thrust (MMT) strikes east-west across the Swat Valley, separates regions...
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...
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...
Measurements of storm-generated bottom stresses on the continental shelf
D.A. Cacchione, D.E. Drake
1982, Journal of Geophysical Research - Oceans (87) 1952-1960
Large values of bottom friction velocity, u*, and roughness length, z0, determined from burst-averaged speed data taken on the continental shelf in outer Norton Sound, Alaska, with the GEOPROBE tripod during a storm in September 1977 are correlated with extremely large values of near-bottom concentration of total suspended particulate matter (TSM). Combined...
