Microbial oxidation of pyrrhotites in coal chars
K.W. Miller, J.B. Risatti
1988, Fuel (67) 1150-1154
The ability of Thiobacillus ferrooxidans to oxidize pyrrhotite minerals occurring in coal chars was investigated, to evaluate the feasibility of microbial char desulphurization. Bio-oxidation of pyrrhotites in chars produced by two different processes was demonstrated conclusively. Microbial removal of sulphur from a char and its parent coal proceeded at the rate of...
Using side scan sonar data in a geographic information system to locate and display lake trout spawning habitat in the Great Lakes
Charles L. Brown, Thomas A. Edsall, Robert G. Waltermire, Barbara White
1988, Conference Paper, Proceedings of the Fifth National MOSS User's Workshop
The National Fisheries Research Center-Great Lakes of the U.S. Fish and Wildlife Service has extensively used a side scan sonar to survey and pinpoint lake trout spawning grounds in the Great Lakes. The Geographic Information System (GIS) of the National Ecology Research Center produced maps from the side scan sonar...
Experimental oxygen isotope fractionation between siderite-water and phosphoric acid liberated CO2-siderite
W.W. Carothers, L.H. Adami, R.J. Rosenbauer
1988, Geochimica et Cosmochimica Acta (52) 2445-2450
The equilibrium fractionation of O isotopes between synthetic siderite and water has been measured at temperatures ranging from 33° to 197°C. The fractionation between siderite and water over this temperature range can be represented by the equation: 103 ln α = 3.13 × 106T−2 −...
The metal oxide fraction of pelagic sediment in the equatorial North Pacific Ocean: A source of metals in ferromanganese nodules
D.Z. Piper
1988, Geochimica et Cosmochimica Acta (52) 2127-2145
Pelagic sediment recovered at DOMES Site A in the equatorial North Pacific (151°W, 9° 15′N) consists of a surface homogeneous layer, approximately 10 cm thick, overlying a strongly mottled layer that is lighter in color. The radiolarian composition of both units is Quaternary. In areas where this sediment was only...
High-resolution 40Ar 39Ar chronology of Oligocene volcanic rocks, San Juan Mountains, Colorado
M. A. Lanphere
1988, Geochimica et Cosmochimica Acta (52) 1425-1434
The central San Juan caldera complex consists of seven calderas from which eight major ash-flow tuffs were erupted during a period of intense volcanic activity that lasted for approximately 2 m.y. about 26–28 Ma. The analytical precision of conventional K-Ar dating in this time interval is not sufficient to unambiguously...
Thermochronology of economic mineral deposits: Dating the stages of mineralization at Panasqueira, Portugal, by high-precision 40Ar/ 39Ar age spectrum techniques on muscovite
L.W. Snee, J. F. Sutter, W.C. Kelly
1988, Economic Geology (83) 335-354
40 Ar/ 39 Ar age spectrum dates for 13 muscovites have been used to reconstruct the thermal history (thermochronology) of the Panasqueira, Portugal, tin-tungsten deposit, a deposit spatially associated with a belt of Hercynian plutons. Muscovite samples with an age difference as small as 2.2 m.y. (0.7% of the age) are statistically distinct....
Ostwald ripening and interparticle-diffraction effects for illite crystals
D. D. Eberl, J. Srodon
1988, American Mineralogist (73) 1335-1345
The Warren-Averbach method, an X-ray diffraction (XRD) method used to measure mean particle thickness and particle-thickness distribution, is used to restudy sericite from the Silverton caldera. Apparent particle-thickness distributions indicate that the clays may have undergone Ostwald ripening and that this process has modified the K-Ar ages of the samples....
Dating shorelines of lakes in Patagonia, Argentina
R.W. Galloway, Vera Markgraf, J.P. Bradbury
1988, Journal of South American Earth Sciences (1) 195-198
Organic remains from elevated shorelines of two closed basins were radiocarbon dated and document lakes substantially larger than today between 19,500 and 15,000 years BP in northern Patagonia (lat. 41°S), but only for the last 4000 years in southern Patagonia (lat. 49°S). Such latitudinal difference in the timing of high...
National water-quality assessment: Future directions of the U.S. Geological Survey
Philip Cohen, William M. Alley, William G. Wilber
1988, Water Resources Bulletin (24) 1147-1151
Throughout U.S. history, the Nation has made major investments in assessing natural resources, such as soils, minerals, and hydrocarbons. The maintenance and the improvement of water quality has been one of the major areas of public investment and government regulation. One of the contributions the U.S. Geological Survey proposes to...
Selenium in the Kendrick recalamation project, Wyoming
David A. Peterson
1988, Conference Paper
Elevated concentrations of selenium in water, bottom sediment, and biota were noted during a reconnaissance investigation of the Kendrick Reclamation Project in central Wyoming. Dissolved-selenium concentrations in 11 of 24 samples of surface or ground water exceeded the national drinking-water standard of 10 micrograms per liter. Bottom-sediment samples contained concentrations...
Liquid hydrocarbons probable under Ross Sea
A. K. Cooper, F.J. Davey, K. Hinz
1988, Oil & Gas Journal (86) 118-124
Thick glacial strata, which have no source-rock potential, cover the Ross Sea. If these strata persist to great depths, then hydrocarbon-generation prospects will be poor. Deeply buried strata within Ross Sea rift-grabens, if like other Gondwana rift-deposits, could have good potential for hydrocarbon generation. Current hydrocarbon assessments of the Ross...
EFFECTS OF METEOROLOGICAL CHANGES ON CONCENTRATIONS OF HELIUM, CARBON DIOXIDE, AND OXYGEN IN SOIL GASES.
M. E. Hinkle, J. L. Ryder
Grayson S.J.Smith D.A., editor(s)
1988, Conference Paper, Preprint - Society of Mining Engineers of AIME
Samples were collected from a hollow probe at 0. 75-m depth and from a plastic hemisphere on the ground surface. Soil temperature, air temperature, percent humidity, and barometric pressure were also measured. Soil moisture was measured only indirectly as amount of rain or snowfall. Higher concentrations of CO//2 in both...
Evidence for a new geomagnetic reversal from lava flows in Idaho: Discussion of short polarity reversals in the Brunhes and late Matuyama polarity chrons
D.E. Champion, M. A. Lanphere, M. A. Kuntz
1988, Journal of Geophysical Research Solid Earth (93) 11667-11680
K-Ar ages and paleomagnetic data for basalt samples from a new core hole (site E) at the Idaho National Engineering Laboratory (INEL) indicate that the age of the reversed polarity event recorded in Snake River Plain lavas is older than 465±50 ka (1000 years before present) reported previously by Champion...
Methane cycling in the sediments of Lake Washington
K.M. Kuivila, J.W. Murray, A.H. Devol, M.E. Lidstrom, C.E. Reimers
1988, Limnology and Oceanography (33) 571-581
About half of the methane flux from depth is oxidized to CO2 in the upper 0.7 cm of the sediments and the remainder escapes into the water column. In terms of the total carbon budget of the lake, the upward flux of methane is insignificant with only about 2% of...
Determining the distribution of hydraulic conductivity in a fractured limestone aquifer by simultaneous injection and geophysical logging
Roger H. Morin, A.E. Hess, Frederick L. Paillet
1988, Ground Water (26) 587-595
A field technique for assessing the vertical distribution of hydraulic conductivity in an aquifer was applied to a fractured carbonate formation in southeastern Nevada. The technique combines the simultaneous use of fluid injection and geophysical logging to measure in situ vertical distributions of fluid velocity and hydraulic head down the...
Conductive heat flux in VC-1 and the thermal regime of Valles caldera, Jemez Mountains, New Mexico
J.H. Sass, P. Morgan
1988, Journal of Geophysical Research Solid Earth (93) 6027-6039
Over 5% of heat in the western United States is lost through Quaternary silicic volcanic centers, including the Valles caldera in north central New Mexico. These centers are the sites of major hydrothermal activity and upper crustal metamorphism, metasomatism, and mineralization, producing associated geothermal resources. We present new heat flow...
The global distribution, abundance, and stability of SO2 on Io
A. S. McEwen, T. V. Johnson, D. L. Matson, L.A. Soderblom
1988, Icarus (75) 450-478
Sulfur dioxide distribution and abundances, bolometric hemispheric albedos, and passive surface temperatures on Io are modeled and mapped globally from Voyager multispectral mosaics, Earth-based spectra, and photometric descriptions. Photometric models indicate global average values for regolith porosity of 75-95% and macroscopic roughness with a mean slope angle of ~30??. Abundances...
A climatic-limnologic model of diatom succession for paleolimnological interpretation of varved sediments at Elk Lake, Minnesota
Bradbury J. Platt
1988, Journal of Paleolimnology (1) 115-131
Sediment traps placed in the profundal region of Elk Lake, north central Minnesota during the 1979 spring and 1983-84 fall and spring seasons monitored seasonal diatom production for two climatically distinctive periods. The spring of 1979 was one of the coldest and wettest on record. Ice out at Elk Lake...
Long-term fate of organic micropollutants in sewage-contaminated groundwater
Larry B. Barber, M.P. Schroeder, E. Michael Thurman, Denis R. LeBlanc
1988, Environmental Science & Technology (22) 205-211
No abstract available....
The distribution, structure, and composition of freshwater ice deposits in Bolivian salt lakes
S. H. Hurlbert, Cecily C.Y. Chang
1988, Hydrobiologia (158) 271-299
Freshwater ice deposits are described from seven, high elevation (4117-4730 m), shallow (mean depth <30 cm), saline (10-103 g l-1) lakes in the southwestern corner of Bolivia. The ice deposits range to several hundred meters in length and to 7 m in height above the lake or playa surface. They...
Composition and stable-isotope geochemistry of natural gases from Kansas, Midcontinent, U.S.A.
P.D. Jenden, K.D. Newell, I.R. Kaplan, W.L. Watney
1988, Chemical Geology (71) 117-147
More than 28??1012 ft.3 (79??1010 m3) of natural gas and 5.3??109 bbl (8.4??108 m3) of oil have been produced in Kansas, U.S.A., from Paleozoic carbonate and sandstone reservoirs on structural uplifts and shallow embayments along the northern margin of the Anadarko basin. A heavily-explored, geologically well-characterized state, Kansas is an...
Quarterly Wildlife Mortality Report July 1987- September 1987
K. A. Converse, R. Windingstad, J. C. Franson, T. Roffe
1988, Wildlife Disease Newsletter (24)
No abstract available....
Distribution of selected trace and major elements around the massive sulfide deposit at the Penn mine, California
J.A. Peterson
1988, Economic Geology (83) 419-427
No abstract available....
Composition of massive sulfide deposits from the sediment-covered floor of Escanaba Trough, Gorda Ridge: implications for depositional processes
Randolph A. Koski, Wayne C. Shanks III, Wendy A. Bohrson, Robert L. Oscarson
1988, Canadian Mineralogist (26 pt 3) 655-673
Massive sulfide deposits with two distinct compositions are spatially related to volcanic edifices that penetrate up to 500 m of turbiditic sediment in Escanaba Trough (ET), southern Gorda Ridge. The mineralogy, metal content, sulfur isotope composition, and hydrocarbon content of massive sulfides from ET reflect the extensive interaction between underlying...
Shocked quartz grains at the Cretaceous-Tertiary boundary - Not volcanic or atmospherically transported
R. Seitz, B.F. Bohor
1988, Die Naturwissenschaften (75) 307-308
[No abstract available]...
