Possible evidence for subducted sedimentary materials beneath central California
A.M. Trehu, W.H. Wheeler IV
1987, Geology (15) 254-258
Seismic reflection and refraction data from the Coast Ranges of central California west of the San Andreas fault suggest the presence of a low-velocity (4.5–5.0 km/s) wedge at a depth of about 15–22 km that dips east beneath rocks of both the Franciscan...
The Upper Paleozoic pebbly mudstone facies of peninsular Thailand and western Malaysia - Continental margin deposits of Palaeoeurasia - Discussion
P.H. Stauffer, L.C. Peng
1987, Geologische Rundschau (76) 945-948
[No abstract available]...
Multiple sources of alkanes in Quaternary oceanic sediment of Antarctica
Keith A. Kvenvolden, John B. Rapp, Margaret Golan-Bac, Frances D. Hostettler
1987, Organic Geochemistry (11) 291-302
Normal alkanes (n-C13n-C36), isoprenoid hydrocarbons (i-C15, i-C16, i-C18, i-C19, and i-C20) triterpanes (C27C32), and (C27C29) are present in low concentrations offshore Antarctica in near-surface, Quaternary sediment of the Wilkes Land continental margin and of the western Ross Sea. The distributions of these...
New U/Pb Ages from Granite and Granite Gneiss in the Ruby Geanticline and Southern Brooks Range, Alaska
W. W. Patton Jr., T. W. Stern, Joseph G. Arth, C. Carlson
1987, Journal of Geology (95) 118-126
New U/Pb zircon ages from the Ray Mountains of central Alaska clarify the plutonic history of the Ruby geanticline and support earlier suggestions that the Ruby geanticline and S Brooks Range were once parts of the same tectonostratigraphic terrane. U/Pb zircon ages of 109 to 112 Ma from the Ray...
Basement thrust sheets in the Clearwater orogenic zone, central Idaho and western Montana
B. Skipp
1987, Geology (15) 220-224
The Clearwater orogenic zone in central Idaho and western Montana contains at least two major northeast-directed Cordilleran thrust plates of Early Proterozoic metasedimentary and metaigneous rocks that overrode previously folded Middle Proterozoic rocks of the Belt basin in Cretaceous time. The northeastward migration...
USE OF TOPOLOGICAL INFORMATION IN HYDROGRAPH ESTIMATION.
M.R. Karlinger, D.P. Guertin, B.M. Troutman
1987, Water Resources Bulletin (23) 271-279
Discharge hydrographs computed from the theory of linear flow through topologically random channel networks are compared to actual discharge hydrographs for basins in semiarid regions of central Wyoming. The basins drained by the channel networks range in the size from 0. 69 to 10. 8 square miles. Topological information consisting...
Observations and controls on the occurrence of inherited zircon in Concord-type granitoids, New Hampshire
T.M. Harrison, J. N. Aleinikoff, W. Compston
1987, Geochimica et Cosmochimica Acta (51) 2549-2558
U-Pb analyses of zircons separated from two Concord-type plutons near Sunapee and Dixville Notch, New Hampshire, reveal differences in the pattern and magnitude of zircon inheritance which are related to differences in melt chemistry. The Sunapee pluton contains only slightly more Zr than required to saturate the melt at the...
Persistent late Pleistocene-Holocene seasonal upwelling and varves off the coast of California
R.Y. Anderson, E. Hemphill-Haley, J.V. Gardner
1987, Quaternary Research (28) 307-313
Seasonal production of siliceous phytoplankton and a seasonal flux of terrigenous clastic material produced varved sediments along the continental slope off California during the late Pleistocene to mid-Holocene. Light-colored sediment within laminations and in sediment-trap samples was deposited during summer upwelling and contains an abundance of the diatoms Skeletonema costatum...
Distribution of ferromanganese nodules in the Pacific Ocean.
D.Z. Piper, T. R. Swint-Iki, F.W. McCoy
1987, Chemie der Erde (46) 171-184
The occurrence and distribution of deep-ocean ferromanganese nodules are related to the lithology of pelagic surface-sediment, sediment accumulation rates, sea-floor bathymetry, and benthic circulation. Nodules often occur in association with both biosiliceous and pelagic clay, and less often with calcareous sediment. Factors which influence the rather complex patterns of sediment...
Hydraulic/Chemical Changes During Ground-Water Recharge by Injection
Scott N. Hamlin
1987, Groundwater (25) 267-274
Ground-water recharge by injection of reclaimed water is a feasible method of improving ground-water quality in the shallow aquifer system in the Palo Alto Baylands along the San Francisco Bay. Ground water was initially more saline than sea water. Reclaimed water was injected at a...
The solubilities of some major and minor element minerals in ground waters associated with a sandstone-hosted uranium deposit
Richard B. Wanty, J. R. Chatcham, D. Langmuir
1987, Bulletin de Mineralogie (110) 209-226
Ground-water samples from 41 wells penetrating basal Oakville sandstone (Miocene) in S Texas were chemically analysed to identify chemical changes related to nearby U orebodies. The coverage included a 240 km2 area which contains several fault-related U deposits. Factors affecting the hydrochemistry include: 1) relatively high permeabilities of buried fluvial-channel...
An automated technique for flow measurements from mariotte reservoirs
Jim Constantz, Fred Murphy
1987, Soil Science Society of America Journal (51) 252-254
The mariotte reservoir supplies water at a constant hydraulic pressure by self-regulation of its internal gas pressure. Automated outflow measurements from mariotte reservoirs are generally difficult because of the reservoir's self-regulation mechanism. This paper describes an automated flow meter specifically designed for use with mariotte reservoirs. The flow meter monitors...
Crustal and upper mantle structure of stable continental regions in North America and northern Europe
R.P. Masse
1987, Pure and Applied Geophysics PAGEOPH (125) 205-239
From an analysis of many seismic profiles across the stable continental regions of North America and northern Europe, the crustal and upper mantle velocity structure is determined. Analysis procedures include ray theory calculations and synthetic seismograms computed using reflectivity techniques. The P wave velocity structure beneath the Canadian Shield is...
Molecular orbital (SCF-Xα-SW) theory of metal-metal charge transfer processes in minerals
David M. Sherman
1987, Physics and Chemistry of Minerals (14) 355-363
A number of mixed valence iron oxides and silicates (e.g., magnetite, ilvaite) exhibit thermally induced electron delocalization between adjacent Fe2+ and Fe3+ ions and optically induced electronic transitions which are assigned to Fe2+→Fe3+ intervalence charge transfer. In this paper, the mechanism of electron delocalization (i.e., polarons versus itinerant electrons) and the nature...
Radiocarbon and cation-radio ages for rock varnish on Tioga and Tahoe marainal boulders of Pine Creek, eastern Sierra Nevada, California, and their paleoclimatic implications
R.I. Dorn, B. D. Turrin, A.J.T. Jull, T.W. Linick, D.J. Donahue
1987, Quaternary Research (28) 36-49
Accelerator mass spectrometry 14C analyses of organic matter extracted from rock varnishes on morainal boulders yield limiting minimum ages for three crests of the Tioga glaciation. At Pine Creek in the eastern Sierra Nevada, varnish started to form on boulders of the outermost Tioga moraine before 19,000 yr B.P., and...
Seafloor gas seeps triggered by a northern California earthquake
M.E. Field, A. E. Jennings
1987, Marine Geology (77) 39-51
A series of marine surveys using high-resolution seismic-reflection and side-scan sonar profiling was conducted on the Klamath River delta from 1977 to 1985. In November 1980, near the middle of this 8-year time period, a major earthquake (magnitude 7) occurred in...
LEAD, TIN, AND PRECIOUS-METAL MINERALIZATION IN THE U. S. VIRGIN ISLANDS.
H. V. Alminas, R. E. Tucker
1987, Conference Paper, Preprint - Society of Mining Engineers of AIME
This regional geochemical study of the U. S. Virgin Islands demonstrates the presence of a widespread base-metal (primarily Pb, Sn, Cu) and precious-metal (primarily Ag) mineralization on all three of the islands. The overall association: Au, Ag, Te, Sn, Pb, Cu, Zn, Sb, Bi, Mo, As and Ba shows a...
Depth-averaging effects on hydraulic head for media with stochastic hydraulic conductivity
R.L. Naff, A. V. Vecchia
1987, Water Resources Research (23) 561-570
Hydraulic conductivity of a porous medium frequently is considered to be a single realization of a three-dimensional spatial stochastic process. The most common observations of flow in porous media are hydraulic-head measurements obtained from wells which are screened over extensive sections of the medium. These measurements represent, approximately, a one-dimensional...
Usefulness of weak bands in midinfrared remote sensing of particulate planetary surfaces
J.W. Salisbury, B. Hapke, J.W. Eastes
1987, Journal of Geophysical Research Solid Earth (92) 702-710
Midinfrared (2.5–25 μm) reflectance spectra of minerals are often used to predict emittance qualitatively. These spectra display weak overtone and combination tone bands, which may be as diagnostic of composition as the strong fundamental molecular vibration bands usually considered for remote sensing applications, but which have been widely ignored. However,...
Archean inheritance in zircon from late Paleozoic granites from the Avalon zone of southeastern New England: An African connection
R. E. Zartman, Hermes O. Don
1987, Earth and Planetary Science Letters (82) 305-315
In southeastern New England the Narragansett Pier Granite locally intrudes Carboniferous metasedimentary rocks of the Narragansett basin, and yields a monazite UPb Permian emplacement age of 273 ± 2Ma. Zircon from the Narragansett Pier Granite contains a...
Identification of the three serotypes of viral hemorrhagic septicemia virus by immunoblot assay using antiserum to serotype F1
P. E. McAllister, W. J. Owens
1987, Bulletin of the European Association of Fish Pathologists (7) 90-92
Ingestion of plastic debris by Laysan albatrosses and wedge-tailed shearwaters in the Hawaiian Islands
D.M. Fry, S.I. Fefer, L. Sileo
1987, Marine Pollution Bulletin (18) 339-343
Surveys of Laysan Albatross and Wedge-tailed Shearwaters on Midway and Oahu Island, Hawaii, identified a high proportion of birds with plastic in the upper gastrointestinal tract, representing hazards to the health of adult birds and their chicks. Fifty Laysan Albatross chicks were examined for plastic items lodged within the upper...
Benthic foraminifera of the Panamanian Province: distribution and origins.
R.W. Crouch, C. W. Poag
1987, Journal of Foraminiferal Research (17) 153-176
Two hundred twenty-nine species of benthic foraminifera have been identified from 96 stations representing 33 localities on the eastern Pacific inner continental shelf, ranging from southern Peru to northern Baja California. Their distributions mark nearshore provincial boundaries that are nearly identical with those previously documented from the distribution of ostracodes...
Sericite from the Silverton caldera, Colorado: correlation among structure, composition, origin, and particle thickness.
D. D. Eberl, J. Srodon, M. Lee, P.H. Nadeau, H. R. Northrop
1987, American Mineralogist (72) 914-934
The mineralogy and the origin of a suite of almost pure sericites, collected from fractures in hydrothermally altered volcanic rocks in the vicinity of the Silverton caldera in the western San Juan Mountains of Colorado, USA, are analysed.-J.A.Z....
Origin of the lethal gas burst from Lake Monoun, Cameroun
Haraldur Sigurdsson, J.D. Devine, F.M. Tchua, F.M. Presser, M.K.W. Pringle, William C. Evans
1987, Journal of Volcanology and Geothermal Research (31) 1-16
On 15 August, 1984, a lethal gas burst issued from a submerged 96-m-deep crater in Lake Monoun in Cameroun, western Africa, killing 37 people. The event was associated with a landslide from the eastern crater rim, which slumped into deep water. Waters below 50 m are anoxic, dominated by high...
