Isotopic composition of interstitial fluids in sediment of the Nankai Trough, Deep Sea Drilling Project Leg 87
George E. Claypool, A.K. Vuletich, Keith A. Kvenvolden
1986, Initial Reports of the D.S.D.P. (87) 857-860
The isotopic compositions of dissolved CO2 and CH4 in sediments of the Nankai Trough indicate that CH4 is formed during early diagenesis by microbial reduction of CO2 . At the shallowest sampled depths, the CO2 dissolved in the pore water is unusually enriched in 12C (δ13C = - 35.2‰), indicating...
Comment and Reply on “Gas hydrates on the northern California continental margin”: REPLY
Michael E. Field, Keith A. Kvenvolden
1986, Geology (14) 537-538
No abstract available....
Dipping reflectors in the Norwegian Sea—ODP Leg 104 drilling results: LEG 104 SCIENTIFIC PARTY
O. Eldholm, Jorn Thiede, E. Taylor, K. Bjorklund, U. Bleil, P. Cielsielski, A. Despraries, D. Donnally, C. Froget, R. Goll, R. Henrich, E. Jansen, L. Krissek, Keith A. Kvenvolden, A.P. LeHuray, D. Love, P. Lysne, T.J. McDonald, P.J. Mudie, Lisa E. Osterman, L.M. Parson, J. Phillips, A. Pittenger, G. Qvale, G. Schoenharting, L. Viereck-Goette, A. Morton, I. Gibson
1986, Journal of the Geological Society (143) 911-912
Ocean Drilling Program (ODP) Leg 104 successfully completed a number of deep drill holes on the Outer V0ring Plateau and the Vering Basin during July and August 1985 (Fig. 1; Eldholm, Thiede, Taylor et al. 1986). One of the principal objectives of the leg was to drill and sample a...
Geochemical imprint of depositional conditions on organic matter in laminated—Bioturbated interbeds from fine-grained marine sequences
Lisa M. Pratt, George E. Claypool, J. David King
1986, Marine Geology (70) 67-84
Laminated organic-rich shales are interbedded at a scale of centimeters to a few meters with bioturbated organic-poor mudstones or limestones in some fine-grained marine sequences. We have analyzed the organic matter in pairs of laminated/bioturbated interbeds from Cretaceous and Devonian rocks deposited in epicontinental and oceanic settings for the purpose...
Depletion of 13C in Cretaceous marine organic matter: Source, diagenetic, or environmental sigal?
Walter E. Dean, Michael A. Arthur, George E. Claypool
1986, Marine Geology (70) 119-157
Geochemical studies of Cretaceous strata rich in organic carbon (OC) from Deep Sea Drilling Project (DSDP) sites and several land sections reveal several consistent relationships among amount of OC, hydrocarbon generating potential of kerogen (measured by pyrolysis as the hydrogen index, HI), and the isotopic composition of the OC. First,...
Reproduction of bobwhites fed different dietary concentrations of an organophosphate insecticide, methamidophos
K. L. Stromborg
1986, Archives of Environmental Contamination and Toxicology (15) 143-147
Pairs of first-year breeding bobwhites were fed constant or variable concentrations of methamidophos for 15 days, or a control diet in a pair-fed design in which they were matched by body weights to pairs in the constant group. Treatments for the constant group were 5.0, 7.8, 12.3, 19.2, and 30.0...
Wildlife in some areas of New Mexico and Texas accumulate elevated DDE residues, 1983
Donald H. White, Alexander J. Krynitsky
1986, Archives of Environmental Contamination and Toxicology (15) 149-157
Over the last decade, data gathered by the U.S. Fish & Wildlife Service's National Contaminant Biomonitoring Program have identified an area of elevated DDE contamination in portions of New Mexico and Texas. Extensive wildlife sampling in 1983 confirmed that DDE, the major metabolite of the insecticide DDT, was present at...
Bird predation on cutworms (Lepidoptera: Noctuidae) in wheat fields and chlorpyrifos effects on brain cholinesterase activity
L. C. McEwen, Lawrence R. DeWeese, P. Schladweiler
1986, Environmental Entomology (15) 147-151
Horned larks, Eremophila alpestris (L.), and McCown's longspurs, Calcarius mccownii (Lawrence), were collected at intervals from two winter wheat fields in Montana after aerial application of chlorpyrifos to control cutworms. Both bird species had a high (95–100%) incidence of Lepidoptera, mostly pale western cutworms, Agrotis orthogonia Morrison, in their stomachs at 3 days postspray. Incidence of...
Mast foraging by West Indian manatees (Trichechus manatus)
Thomas J. O'Shea
1986, Journal of Mammalogy (67) 183-185
No abstract available....
Application of continuous seismic reflection methods to hydrologic studies
F.P. Haeni
1986, Groundwater (24) 23-31
Oil and gas exploration and engineering studies in water‐covered areas routinely use continuous seismic profiling techniques to obtain subsurface geologic information. Such profiling also can be used effectively in hydrologic studies to define the geologic framework of aquifer systems, to locate hydrologic boundaries, and in some places, to interpret the...
Stratigraphy and correlation of the glacial deposits on the Montana Plains
David S. Fullerton, Roger B. Colton
1986, Quaternary Science Reviews (5) 69-82
Till units representing at least three pre-Illinoian continental glaciations, at least one Illinoian glaciation, and a late Wisconsin glaciation have been identified on the Montana Plains. Early Wisconsin or middle Wisconsin till units have not been identified. The southernmost limit of late Wisconsin glaciation is in Montana, more than 170...
Introduction to quaternary glaciations in the United States of America
Gerald M. Richmond, David S. Fullerton
1986, Quaternary Science Reviews (5) 3-10
No abstract available....
World slope map
James G. Moore, R. K. Mark
1986, Eos, Transactions, American Geophysical Union (67) 1353-1362
A colored slope map (scale 1:80,000,000) was generated from digital land and sea floor elevations at 5‐min spacings from data tapes from the National Geophysical Data Center. Slope analysis is facilitated by examining the average slope in 250‐m altitude‐depth intervals both globally and in each of eight tectonic plates. The...
Hydrothermal minerals and alteration rates at Surtsey volcano, Iceland
S. P. Jakobsson, James G. Moore
1986, GSA Bulletin (97) 648-659
The volcanic island Surtsey, off the south coast of Iceland, was created by volcanic activity in 1963–1967. Core from a 181-m-deep hole extending 123 m below sea level shows the results of 12 yr of hydrothermal alteration of basaltic tephra. The primary cause of heating of the tephra and of...
Geomorphic evidence for the distribution of ground ice on Mars
S. W. Squyres, M. H. Carr
1986, Science (231) 249-252
High-resolution Viking orbiter images show evidence for quasi-viscous relaxation of topography. The relaxation is believed to be due to creep deformation of ice in near-surface materials. The global distribution of the inferred ground ice shows a pronounced latitudinal dependence. The equatorial regions of Mars appear to be ice-poor, while the...
Late Neogene and Quaternary coarse-fraction and carbonate stratigraphies for Site 586 on Ontong-Java Plateau and Site 591 on Lord Howe Rise
J. V. Gardner, Walter E. Dean, Lynne Bisagno, Eileen Hemphill-Haley
1986, Initial Reports of the D.S.D.P. (90) 1020-1124
Carbonate oozes recovered by hydraulic piston coring at DSDP Site 586 on Ontong-Java Plateau and Site 591 on Lord Howe Rise have carbonate contents that are consistently higher than 90% with only minor variations. Consequently, paleoceanographic signals were not recorded in detail in the carbonate contents. However, mass accumulation rates...
Rhythmic bedding in Upper Cretaceous pelagic carbonate sequences: Varying sedimentary response to climatic forcing
M.A. Arthur, D.J. Bottjer, Walter E. Dean, A.G. Fischer, D.E. Hattin, E.G. Kauffman, L.M. Pratt
1986, Geology (14) 153-156
Rhythmic bedding is a prominent feature of North American and European Upper Cretaceous pelagic carbonate sequences deposited in epicontinental and continental-edge settings. Such bedding rhythms can result from variations in carbonate productivity, terrigenous dilution, redox conditions, or bottom currents. Each type of bedding cycle is expressed differently in the stratigraphic...
Rhythmic bedding produced in Cretaceous pelagic carbonate environments: Sensitive recorders of climatic cycles
D.J. Bottjer, M.A. Arthur, Walter E. Dean, D.E. Hattin, Charles Savrda
1986, Paleoceanography (1) 467-481
Various types of rhythmic bedding are prominent features of Cretaceous pelagic carbonates. These bedding rhythms are the primary depositional result of variations in carbonate productivity, terrigenous dilution, redox conditions and/or the energy of bottom currents. Each bedding cycle type is different in its expression in the stratigraphic record but ultimately...
Milankovitch cycles in Neocene deep‐sea sediment
Walter E. Dean, J. V. Gardner
1986, Paleoceanography (1) 539-553
Pelagic carbonate sediments from the world ocean basins commonly show cyclic variations in amount and/or degree of preservation of biogenic calcite, with periodicities of several tens to several hundreds of thousands of years. The direct causes of these cycles are fluctuations in noncarbonate dilution, carbonate production, carbonate dissolution, and/or current...
Geology of the Harrisonburg and Bridgewater quadrangles, Virginia
Thomas M. Gathright II, Peter S. Frischmann
1986, Book, Virginia Division of Mineral Resources Publication
The Harrisonburg and Bridgewater quadrangles comprise an area of approximately 117 square miles in Rockingham County in northwestern Virginia.This area is in the western part of the Shenandoah Valley, a portion of the Valley and Ridge physiographic province, and contains parts of three major geologic structures-the Staunton and North Mountain...
Water-quality data for the ground-water network in eastern Broward County, Florida, 1983-84
Bradley G. Waller, Frank L. Cannon
1986, Open-File Report 86-313
During 1983-84, ground water from 63 wells located at 31 sites throughout, eastern Broward County, Florida, was sampled and analyzed to determine baseline water-quality conditions. The physical and chemical parameters analyzed included field measurements (pH and temperature), physical characteristics (color, turbidity, and specific conductance), major inorganic ions, nutrients (nitrogen, phosphorus,...
The Coordinate
U.S. Eastern Mapping Center
1986, Report
No abstract available....
Distribution and habitat of Nitellopsis obtuse (Characeae) in the Laurentian Great Lakes
Donald W. Schloesser, Patrick L. Hudson, S. Jerrine Nichols
1986, Hydrobiologia (133) 91-96
Nitellopsis obtusa, a macroalga (Characeae) native to Europe and Asia, was found in U.S. waters of the St. Clair-Detroit River system in 1983, thus extending the range of this taxon into the Laurentian Great Lakes about 850 km from the St. Lawrence River where it was...
Demographic structure of chaparral under extended fire-free conditions
Jon E. Keeley, A. Brooks, T. Bird, S. Cory, H. Parker, E. Usinger
J.J. DeVries, editor(s)
1986, Book, Proceedings of the Chaparral Ecosystems Research Conference
No abstract available....
Mineral resources of wilderness study areas: east-central Nevada and part of adjacent Beaver County, Utah
1986, Bulletin 1728
No abstract available....
