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Page 5221, results 130501 - 130525

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Molecular and isotopic compositions of hydrocarbons at Site 533, Deep Sea Drilling Project Leg 76
J.M. Brooks, L.A. Barnard, D.A. Wiesenburg, M.C. Kennicutt II, Keith A. Kvenvolden
1983, Initial Reports of the D.S.D.P. (76) 377-389
In an investigation of gas hydrates in deep ocean sediments, gas samples from Deep Sea Drilling Project Site 533 on the Blake Outer Ridge in the northwest Atlantic were obtained for molecular and isotopic analyses. Gas samples were collected from the first successful deployment of a pressure core barrel (PCB)...
Concentrations and carbon isotopic compositions of CH4 and CO2 in gas from sediments of the Blake Outer Ridge, Deep Sea Drilling Project Leg 76
E.M. Galimov, Keith A. Kvenvolden
1983, Initial Reports of the D.S.D.P. (76) 403-407
The principal gaseous carbon-containing components identified in the first 400 m of sediment at Deep Sea Drilling Project Site 533, Leg 76, are methane (CH4 ) and carbon dioxide (CO2 ). Below a sub-bottom depth of about 25 m, sedi ment cores commonly contained pockets caused by the expansion of...
Wildlife guilds in Arizona desert habitats
Henry L. Short
1983, Report
This report summarizes information produced from Interagency Agreement No. AA-851-IA1-27 between the Bureau of Land Management (BLM), USDI, and the Fish and Wildlife Service (FWS), USDI. The contract was instrumental in the final development of wildlife guilds for the Hualapai-Aquarius planning area of the BLM in westcentral Arizona, reported...
Relation of concealed faults to water quality and the formation of solution features in the Floridan aquifer, northeastern Florida, U.S.A.
G.W. Leve
1983, Journal of Hydrology (61) 251-264
Geological and hydrological information on the Floridan aquifer in northeastern Florida indicates that isolated occurrences of water having relatively high chloride concentration in the upper part of the aquifer may be associated with buried faults. Water having chloride concentrations of more than 700 mg l−1 occurs in the deeper zone of...
Hydrostratigraphic subdivisions and fault barriers of the Edwards aquifer, south-central Texas, U.S.A.
R.W. Maclay, T. A. Small
1983, Journal of Hydrology (61) 127-146
The karstic Edwards Limestone within the Balcones Fault Zone of south-central Texas forms a productive confined aquifer that consists predominately of dense carbonate rocks and contains several layers of highly permeable and porous honeycombed rocks that have been produced by the leaching of evaporitic, tidal flat or reefal deposits. Fractures...
A system for measuring bottom profile, waves and currents in the high-energy nearshore environment
Asbury H. Sallenger Jr., P.C. Howard, C.H. Fletcher III, P.A. Howd
1983, Marine Geology (51) 63-76
A new data-acquisition system capable of measuring waves, currents and the nearshore profile in breaking waves as high as 5 m has been developed and successfully field-tested. Components of the mechanical system are a sled carrying a vertical mast, a double-drum winch placed landward of the beach, and a line...
Experimental deformation of polycrystalline H2O ice at high pressure and low temperature: Preliminary results
W.B. Durham, H. C. Heard, Stephen H. Kirby
1983, Journal of Geophysical Research B: Solid Earth (88) B377-B392
Interest in the mechanical properties of water ice under the conditions in which it exists in the outer solar system has motivated the development and use of a new high‐pressure, low‐temperature triaxial deformation apparatus. Constant displacement rate tests on 70 samples of pure polycrystalline water ice have been performed at...
Rheology of the lithosphere
Stephen H. Kirby
1983, Reviews of Geophysics and Space Physics (21) 1458-1487
During the quadrennial term 1979–1982, major advances have been made in our knowledge of the rheology of the oceanic lithosphere by the skillful combination of experimental and theoretical rock mechanics, seismology and marine geophysics in increasingly sophisticated models for the flexure of the oceanic lithosphere at seamounts and island chains,...
Geologic evolution of Hess Rise, central North Pacific Ocean
T. L. Vallier, Walter E. Dean, David K. Rea, Jorn Thiede
1983, GSA Bulletin (94) 1289-1307
Cores from four Deep Sea Drilling Project (DSDP) sites (310, 464, 465, and 466) and seismic-reflection profiles provide data that are used to interpret the geological evolution and paleoenvironments of Hess Rise, a prominent oceanic plateau in the central North Pacific Ocean. Hess Rise apparently formed in the Southern Hemisphere...
The chemical composition of lakes in the north‐central United States
Eville Gorham, Walter E. Dean, J.E. Sanger
1983, Limnology and Oceanography (28) 287-301
Lake waters of the north‐central U.S.A. are classified into five groups, based on increasing specific conductivity and changes in ionic composition from east to west, from Wisconsin through Minnesota to North and South Dakota. The most dilute group of waters has specific conductivities <29 µmhos · cm−1 at 25°C; the most concentrated...
Tectonic evolution of Gulf of Anadyr and formation of Anadyr and Navarin basins
Michael S. Marlow, Alan K. Cooper, Jonathan R. Childs
1983, AAPG Bulletin (67) 646-665
New seismic reflectionand refraction data reveal that Anadyr basin is separated from Navarin basin by Anadyr ridge, a southeast-northwest-trending bedrock high that is characterized by high-amplitude, short-wavelength magnetic anomalies. Anadyr ridge may be an offshore extension of the melange belt underlying the Koryak Range. Sonobuoy refraction data indicate that the...
Wandering terranes in southern Alaska: The Aleutia Microplate and implications for the Bering Sea
Michael S. Marlow, Alan K. Cooper
1983, Journal of Geophysical Research B: Solid Earth (88) 3439-3446
Paleomagnetic and geological data suggest that much of southern Alaska is a collage of tectonostratigraphic terranes which originated in Mesozoic time at paleolatitudes far south of their present position. The time of ‘docking’ of the terranes against cratonic Alaska is critical to defining their amalgamated size and extent during their...
Nearshore phytoplankton of Hammond Bay, Lake Huron
Charles L. Brown, Bruce A. Manny
1983, Journal of Great Lakes Research (9) 523-529
To predict the effects of increased nutrient loading on nearshore phytoplankton populations in northern Lake Huron, we collected phytoplankton from a small, nearshore water intake at Hammond Bay four times per week from August 1973 to July 1975. Phytoplankton density, taxonomic composition, and biomass in the nearshore waters followed predictable,...
The Galilean satellite geological mapping program
Baerbel K. Lucchitta
1983, Conference Paper
The Galilean Satellite Geological Mapping Program was established to illuminate detailed geologic relations on the four large satellites of Jupiter. The program involves about 40 investigators from various universities, reseach institutes, and government offices in the United Sttes, England, Germany, and Italy. A total of 24 researchers have been assigned...