Platinum-group elements in rocks from the voikar-syninsky ophiolite complex, Polar Urals, U.S.S.R.
N.J. Page, P. J. Aruscavage, J. Haffty
1983, Mineralium Deposita (18) 443-455
Analyses of platinum-group elements (PGE) in rocks collected from the Voikar-Syninsky ophiolite in the Polar Urals suggest that the distribution and geochemistry of PGE in this Paleozoic ophiolite are similar to those in Mesozoic ophiolites from elsewhere. Chondrite-normalized PGE patterns for chromitite, the tectonite unit, and ultramafic and mafic cumulate...
Dual extraction of R-mode and Q-mode factor solutions
D. Zhou, T. Chang, J.C. Davis
1983, Journal of the International Association for Mathematical Geology (15) 581-606
It is mathematically possible to extract both R-mode and Q-mode factors simultaneously (RQ-mode factor analysis)by invoking the Eckhart-Young theorem. The resulting factors will be expressed in measures determined by the form of the scalings that have been applied to the original data matrix. Unless the measures for both solutions are...
Eruptive history of Mount Mazama and Crater Lake Caldera, Cascade Range, U.S.A.
C. R. Bacon
1983, Journal of Volcanology and Geothermal Research (18) 57-115
New investigations of the geology of Crater Lake National Park necessitate a reinterpretation of the eruptive history of Mount Mazama and of the formation of Crater Lake caldera. Mount Mazama consisted of a glaciated complex of overlapping shields and stratovolcanoes, each of which was probably active for a comparatively short...
An examination of the southern California field test for the systematic accumulation of the optical refraction error in geodetic leveling
R. O. Castle, B.W. Brown Jr., T.D. Gilmore, R. K. Mark, R. C. Wilson
1983, Geophysical Research Letters (10) 1081-1084
Appraisals of the two levelings that formed the southern California field test for the accumulation of the atmospheric refraction error indicate that random error and systematic error unrelated to refraction competed with the systematic refraction error and severely complicate any analysis of the test results. If...
On the reported optical activity of amino acids in the Murchison meteorite
J.L. Bada, J.R. Cronin, M.-S. Ho, K.A. Kvenvolden, J.G. Lawless, S.L. Miller, John Oro, S. Steinberg
1983, Nature (301) 494-496
In analyses of extracts from the Murchison meteorite (a carbonaceous chondrite), Engel and Nagy1 reported an excess of L-enantiomers for several protein amino acids but found that the non-protein amino acids were racemic. They suggested that the excess of L-isomers might have resulted from an asymmetric synthesis or decomposition. Their...
Reassessment of the rates at which oil from natural sources enters the marine environment
K.A. Kvenvolden, J.W. Harbaugh
1983, Marine Environmental Research (10) 223-243
Previous estimates of the world-wide input of oil to the marine environment by natural seeps ranged from 0??2 to 6??0 million (metric) tonnes per year with a 'best estimate' of 0??6 million tonnes per year. Based on considerations of the availability of oil for seepage from the world's known and...
Thermal areas on Kilauea and Mauna Loa Volcanoes, Hawaii
Thomas J. Casadevall, Richard W. Hazlett
1983, Journal of Volcanology and Geothermal Research (16) 173-188
Active thermal areas are concentrated in three areas on Mauna Loa and three areas on Kilauea. High-temperature fumaroles (115-362°C) on Mauna Loa are restricted to the summit caldera, whereas high-temperature fumaroles on Kilauea are found in the upper East Rift Zone (Mauna Ulu summit fumaroles, 562°C), middle East Rift Zone...
New evidence for the age of the Gubik Formation Alaskan North Slope
C.A. Repenning
1983, Quaternary Research (19) 356-372
At several Alaskan North Slope localities south of the shore of the Arctic Ocean the Gubik Formation, herein regarded as latest Pliocene and Pleistocene in age, contains a marine unit at its base. Near Ocean Point and near Teshekpuk Lake this basal unit, or the lowest exposed marine unit, of...
Requirements for modeling trace metal partitioning in oxidized estuarine sediments
Samuel N. Luoma, J.A. Davis
1983, Marine Chemistry (12) 159-181
The fate of particulate-bound metals is of particular importance in estuaries because major biological energy flows involve consumption of detrital particles. The biological impact of particulate-bound metals is strongly influenced by the partitioning of metals among sediment components at the oxidized sediment-water interface. Adequate methods for directly measuring this partitioning...
Structure and petrology of the La Perouse gabbro intrusion, Fairweather Range, southeastern Alaska
R. A. Loney, G. R. Himmelberg
1983, Journal of Petrology (24) 377-423
The middle Tertiary La Perouse gabbro intrusion occurs in a Mesozoic metamorphic terrane (Chugach terrane) in the Fairweather Range, southeastern Alaska. The intrusion is 12 km wide and 27 km long, and has an exposed cumulate layering thickness of about 6000 m. The contact consists of biotite and hornblende...
Tectonic uplift of a middle Wisconsin marine platform near the Mendocino triple junction California
R. J. McLaughlin, K. R. Lajoie, D. H. Sorg, S.D. Morrison, J. A. Wolfe
1983, Geology (11) 35-39
An uplifted wave-cut marine platform eroded across bedrock of the Franciscan Complex at Point Delgada, northern California, is overlain by 0.5 to 5 m of wave-worked pea gravel, which is in turn directly overlain by fluvial gravel and silt deposited as alluvial fans....
The use of sagebrush (Artemisia) as a biogeochemical indicator of base-metal deposits in Precambrian rocks of west-central Colorado
T.G. Lovering, J. A. Hedal
1983, Journal of Geochemical Exploration (18) 205-230
The efficacy of sagebrush (Artemisia) as a biogeochemical indicator of base-metal mineralization in stratabound Precambrian ore deposits in west-central Colorado was investigated by collecting new (mostly flowering) growth from several sagebrush shrubs over and near five such deposits in three different areas. These are the Sedalia mine and two mines...
The compositionally zoned eruption of 1912 in the Valley of Ten Thousand Smokes, Katmai National Park, Alaska
W. Hildreth
1983, Journal of Volcanology and Geothermal Research (18) 1-56
On June 6–8, 1912, ∼ 15 km3 of magma erupted from the Novarupta caldera at the head of the Valley of Ten Thousand Smokes (VTTS), producing ∼ 20 km3 of air-fall tephra and 11–15 km3 of ash-flow tuff within ∼ 60 hours. Three discrete periods of ash-fall at Kodiak correlate, respectively, with Plinian...
In situ capture gamma-ray analysis of coal in an oversize borehole
J.L. Mikesell, D.W. Dotson, F. E. Senftle, R.S. Zych, J. Koger, L. Goldman
1983, Nuclear Instruments and Methods In Physics Research (215) 561-566
In situ capture gamma-ray analysis in a coal seam using a high resolution gamma-ray spectrometer in a close-fitting borehole has been reported previously. In order to check the accuracy of the method under adverse conditions, similar measurements were made by means of a small-diameter sonde in an oversize borehole in...
Ground-water models for water resource planning
J.E. Moore
1983, GeoJournal (7) 453-458
In the past decade hydrogeologists have emphasized the development of computer-based mathematical models to aid in the understanding of flow, the transport of solutes, transport of heat, and deformation in the ground-water system. These models have been used to provide information and predictions for water managers. Too frequently, ground-water was...
Ground water for oil-shale development, Piceance Basin, Colorado
W.M. Alley
1983, Ground Water (21) 456-464
Vast deposits of oil shale are contained in the Piceance basin in northwestern Colorado. The basin may contain as much as 40 million acre-feet of stored water associated with these deposits, much of which may have to be drained for mining. Yet, most analyses of...
Relationship of two lacustrine ostracode species to solute composition and salinity: Implications for paleohydrochemistry ( Limnocythere sappaensis/staplini)
R. M. Forester
1983, Geology (11) 435-438
Nonmarine ostracode species are indicative of the physical and chemical nature of lacustrine environments. Although salinity has traditionally been regarded as one of the more important parameters that affect the occurrence patterns of lacustrine ostracodes, examination of the solute composition and salinities of...
Sorption of radium-226 from oil-production brine by sediments and soils
E. R. Landa, D.F. Reid
1983, Environmental Geology (5) 1-8
The sorption of226Ra from oil-production brine by soils and sediments was investigated. Sorption was rapid, and the percentage sorbed increased with brine dilution. Greatest removals of226Ra from sediments in the laboratory occurred with alkaline DTPA, HCl, and BaCl2, with lesser removals using CaCl2 and NaCl solutions. Digestion of sediments with...
Strangways Crater, Northern Territory, Australia: Siderophile element enrichment and lithophile element fractionation
J. W. Morgan, G.A. Wandless
1983, Journal of Geophysical Research Solid Earth (88) A819-A829
The Strangways Crater, Northern Territory, Australia (15°12′S, 133°35′E), has a central core, about 10 km in diameter, of shocked granitic gneiss and amphibolite, and some remnants of a melt rock sheet, surrounded by outer rings of quartzite and siltstone to a diameter of 20–25 km. Seven samples of melt rock...
Intensity patterns in eastern Asia.
J. F. Evernden
1983, Chinese Geophysics (2) 405-438
Investigation of the intensity patterns of earthquakes of E Asia indicates a strong regional pattern of attenuation parameter k and systematic correlation of this pattern with topography, P residuals, and level of seismicity as in the USA.-Author...
Harding Iceland spar: A new δ18O−δ13C carbonate standard for hydrothermal minerals
G. P. Landis
1983, Chemical Geology (41) 91-94
An isotopically homogeneous calcite, Harding Iceland Spar (HIS), having 6180 = +11.78 ± 0.07‰ (= +22.15‰ for CO2) and δ13C = −4.80 ± 0.02‰, has been prepared in quantities suitable for use as a working standard in mass spectrometric analysis. The isotopic values are well-suited for analysis of minerals of hydrothermal...
Human interactions with ground-water
A. Zaporozec
1983, GeoJournal (7) 427-433
Ground-Water could be considered as an immense reservoir, from which only a certain amount of water can be withdrawn without affecting the quantity and quality of water. This amount is determined by the characteristics of the environment in which ground-water occurs and by the interactions of ground-water with precipitation, surface...
U-Th-Pb systematics of zircon inclusions in rock-forming minerals: A study of armoring against isotopic loss using the Sherman Granite of Colorado-Wyoming, USA
J. N. Aleinikoff
1983, Contributions to Mineralogy and Petrology (83) 259-269
Zircon inclusions were separated from the five major rock-forming minerals of the Sherman Granite of southern Wyoming, in order to evaluate the degree of discordance as a possible function of host minerals. U-Th-Pb isotopic ratios were determined for two size fractions of zircon inclusions from each mineral, plus five size...
Geology of the head of Lydonia Canyon, U.S. Atlantic outer continental shelf
David C. Twichell
1983, Marine Geology (54) 91-108
The geology of the part of Lydonia Canyon shoreward of the continental shelf edge on the southern side of Georges Bank was mapped using high-resolution seismic-reflection and side-scan sonar techniques and surface sediment grab samples. The head of the canyon incises Pleistocene deltaic deposits and Miocene shallow marine strata. Medium...
Selective dissolution of siliceous microfossils observed in a box core from the north-east equatorial Pacific
D. Kadko, J. R. Blueford, L.H. Burckle, J. Barron
1983, Nature (302) 139-141
A box core taken at 11??50.3??? N and 137??28.2??? W in the Central Pacific manganese nodule province was studied to determine the pattern of diatom and radiolarian preservation with depth in the sediment, as well as to observe downcore variations in clay mineralogy. We observed marked deterioration of the siliceous...
