Mg- and K-bearing borates and associated evaporites at Eagle Borax spring, Death Valley, California: A spectroscopic exploration
J.K. Crowley
1996, Economic Geology (91) 622-635
Efflorescent crusts at the Eagle Borax spring in Death Valley, California, contain an array of rare Mg and K borate minerals, several of which are only known from one or two other localities. The Mg- and/or K-bearing borates include aristarainite, hydroboracite, kaliborite, mcallisterite, pinnoite, rivadavite, and santite. Ulexite and probertite...
The origin of the Bering Sea basalt province, western Alaska
E. J. Moll-Stalcup
1996, Geology of the Pacific Ocean (12) 671-689
Bering Sea basalt province consists of at least 15 late Cenozoic (less than 6 Ma) volcanic fields that occur on islands in the Bering Sea and along the adjacent west coast of Alaska. The fields are composed of widespread flows of tholeiitic and alkali olivine basalt and small cones, flows,...
Acetochlor in the hydrologic system in the midwestern United States, 1994
D.W. Kolpin, B.K. Nations, D. A. Goolsby, E.M. Thurman
1996, Environmental Science & Technology (30) 1459-1464
The herbicide acetochlor [2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl)acetamide] was given conditional registration in the United States by the U.S. Environmental Protection Agency in March 1994. This registration provided a rare opportunity to investigate the occurrence of a pesticide during its first season of extensive use in the midwestern United States. Water samples collected and...
A camerate-rich late carboniferous (Moscovian) crinoid fauna from volcanic conglomerate, Xinjiang, People's Republic of China
N.G. Lane, J.A. Waters, C.G. Maples, S.A. Marcus, Z.-T. Liao
1996, Journal of Paleontology (70) 117-128
A low-diversity camerate-rich crinoid fauna from the Qijiagou Formation, Taoshigo Valley near Turpan, Xinjiang-Uygar Autonomous Region, China was collected during field work in May, 1993. The crinoid fauna is dominated by species of Platycrinites. Other camerate crinoids include a species in the Paragaricocrinidae, Actinocrinites, a hexacrinitid, and an acrocrinoid. The...
Cryptic trace-element alteration of Anorthosite, Stillwater complex, Montana
G.K. Czamanske, P. J. Loferski
1996, Canadian Mineralogist (34) 559-576
Evidence of cryptic alteration and correlations among K, Ba, and LREE concentrations indicate that a post-cumulus, low-density aqueous fluid phase significantly modified the trace-element contents of samples from Anorthosite zones I and II of the Stillwater Complex, Montana. Concentrations of Ba, Ca, Co, Cr, Cu, Fe, Hf, K, Li, Mg,...
AMS radiocarbon analyses from Lake Baikal, Siberia: Challenges of dating sediments from a large, oligotrophic lake
Steven M. Colman, Glenn A. Jones, M. Rubin, J.W. King, J.A. Peck, W. H. Orem
1996, Quaternary Science Reviews (15) 669-684
A suite of 146 new accelerator-mass spectrometer (AMS) radiocarbon ages provides the first reliable chronology for late Quaternary sediments in Lake Baikal. In this large, highly oligotrophic lake, biogenic and authigenic carbonate are absent, and plant macrofossils are extremely rare. Total organic carbon is therefore the primary material available for...
Source and tectonic implications of tonalite-trondhjemite magmatism in the Klamath Mountains
C. G. Barnes, S. W. Petersen, R. W. Kistler, R. Murray, M. A. Kays
1996, Contributions to Mineralogy and Petrology (123) 40-60
In the Klamath Mountains, voluminous tonalite-trondhjemite magmatism was characteristic of a short period of time from about 144 to 136 Ma (Early Cretaceous). It occurred about 5 to 10 m.y. after the ∼165 to 159 Ma Josephine ophiolite was thrust beneath older parts of the province during the Nevadan orogeny (thrusting from ∼155...
Using hydrogeochemical methods to evaluate complex quaternary subsurface stratigraphy Block Island, Rhode Island, USA
A.I. Veeger, B. D. Stone
1996, Hydrogeology Journal (4) 69-82
One of the major problems in hydrogeologic investigations of glaciated regions is the determination of complex stratigraphic relationships in the subsurface where insufficient information is available from drilling and geophysical records. In this paper, chemical characteristics of groundwater were used to identify stratigraphic changes in glacial deposits that were previously...
Bathythermal distribution, maturity, and growth of lake trout strains stocked in U.S. waters of Lake Ontario, 1978-1993
Joseph H. Elrod, Robert O’Gorman, Clifford P. Schneider
1996, Journal of Great Lakes Research (22) 722-743
Bathythermal distributions, sexual maturity, and growth of lake trout (Salvelinus namaycush) strains stocked in Lake Ontario were determined for fish collected with trawls and gill nets in 1978-93. The purpose was to augment the basis for deciding which strains to continue stocking in an effort to reestablish a self-sustaining...
Origin and significance of high nickel and chromium concentrations in pliocene lignite of the Kosovo Basin, Serbia
L. Ruppert, R. Finkelman, E. Boti, M. Milosavljevic, S. Tewalt, N. Simon, F. Dulong
1996, International Journal of Coal Geology (29) 235-258
Trace element data from 59 Pliocene lignite cores from the lignite field in the Kosovo Basin, southern Serbia, show localized enrichment of Ni and Cr (33-304 ppm and 8-176 ppm, respectively, whole-coal basis). Concentrations of both elements decrease from the western and southern boundaries of the lignite field. Low-temperature ash...
Life history attributes of the rare mayfly Siphlonisca aerodromia Needham (Ephemeroptera:Siphlonuridae)
K.E. Gibbs, M. Siebenmann
1996, Journal of the North American Benthological Society (15) 95-105
Over a 3-y period, we examined the biology of late-instar nymphs, adults, and eggs of the rate predaceous mayfly S. aerodromia at Tomah Stream, Maine, to identify life history attributes associated with the mayfly's movements between the stream channel and the bordering...
Comparison of the partitioning behaviours of yttrium, rare earth elements, and titanium between hydrogenetic marine ferromanganese crusts and seawater
Michael Bau, Andrea Koschinsky, Peter Dulski, James R. Hein
1996, Geochimica et Cosmochimica Acta (60) 1709-1725
In order to evaluate details of the partitioning behaviours of Y, rare earth elements (REEs), and Ti between inorganic metal oxide surfaces and seawater, we studied the distribution of these elements in hydrogenetic marine ferromanganese (Fe-Mn) crusts from the Central Pacific Ocean. Nonphosphatized Fe-Mn crusts display shale-normalized rare earths and...
Introduction: Paleozoic applications of sequence stratigraphy
B.J. Witzke, Greg A. Ludvigson, J. Day
Witzke B.J., editor(s)
1996, Paleozoic sequence stratigraphy: views from the North American craton 1-6
Despite conceptual origins from studies of the Paleozoic strata of cratonic basins, sequence stratigraphy has largely been developed and applied to post-Paleozoic successions in extracratonic settings. The application of continental-margin sequence stratigraphic concepts to cratonic basinal successions is fraught with problems owing to slower rates of sediment accumulation, and consequently,...
Seasonal bathymetric distributions of 16 fishes in Lake Superior, 1958-75
James H. Selgeby, Michael H. Hoff
1996, Biological Science Report 7
The bathymetric distributions of fishes in Lake Superior, which is one of the largest and deepest lakes in the world, has not been studied on a lakewide scale. Knowledge about the bathymetric distributions will aid in designing fish sampling programs, estimating absolute abundances, and modeling energy flow in the...
Kulshan caldera: A quaternary subglacial caldera in the North Cascades, Washington
W. Hildreth
1996, Geological Society of America Bulletin (108) 786-793
Calderas that collapse during large pyroclastic eruptions are anomalously rare in the Cascade arc. Recognition of the early Pleistocene 4.5 × 8 km Kulshan caldera, filled with rhyodacite ignimbrite at the northeast foot of Mount Baker, brings to only three the Quaternary calderas identified in the Cascades. A near-vertical ring...
Paragenetic and minor- and trace-element studies of Mississippi Valley-type ore deposits of the Silesian-Cracow district, Poland
J.G. Viets, D. L. Leach, F.E. Lichte, R.T. Hopkins, C. A. Gent, J. W. Powell
1996, Prace - Panstwowego Instytutu Geologicznego (154) 36-71
Paragenetic and minor- and trace-element studies were conducted on samples of epigenetic ore and gangue minerals collected from mines and drill core in the Silesian-Cracow (S-C) district of southern Poland. Four discrete mineral suites representing four mineralizing stages can be identified throughout the district. The earliest epigenetic minerals deposited during...
Age and character of basaltic rocks of the Yucca Mountain region, southern Nevada
R.J. Fleck, B. D. Turrin, D.A. Sawyer, R.G. Warren, D.E. Champion, M.R. Hudson, S.A. Minor
1996, Journal of Geophysical Research B: Solid Earth (101) 8205-8227
Volcanism in the Yucca Mountain region of southern Nevada in the last 5 m.y. is restricted to moderate-to-small volumes of subalkaline basaltic magmas, produced during at least 6 intervals, and spanning an age range from 4.6 Ma to about 125 ka. Where paleomagnetic evidence is available, the period of volcanism...
Successful nesting behavior of Puerto Rican parrots
K.A. Wilson, R. Field, M.H. Wilson
1995, The Wilson Bulletin (107) 518-529
We analyzed nesting behavior of five pairs of the endangered Puerto Rican Parrot (Amazona vittata) during eight successful nesting attempts. Each stage of the nesting cycle (egg laying, incubation, early chick rearing, and late chick rearing) was characterized by distinct trends or levels of behavior. During egg laying, female attentiveness...
The role of the white-eyed vireo in the dispersal of Bursera fruit on the Yucatan Peninsula
R. Greenberg, M.S. Foster, L. Marquez-Valdelamar
1995, Journal of Tropical Ecology (11) 619-639
White-eyed vireos (Vireo griseus) winter in the forests and secondary growth of the Yucatan Peninsula where Bursera simaruba (Burseraceae) is an abundant tree. Twenty-five per cent of all white-eyed vireos observed foraging visited Bursera trees. In addition, presence and abundance of territorial white-eyed vireos in small forest patches were correlated with...
California condors
Oliver H. Pattee, Robert Mesta
Edward T. LaRoe, Gaye S. Farris, Catherine E. Puckett, Peter D. Doran, Michael J. Mac, editor(s)
1995, Book chapter, Our living resources: A report to the nation on the distribution, abundance, and health of U.S. plants, animals, and ecosystems
The California condor (Gymnogyps californianus) is a member of the vulture family. With a wingspan of about 3 m (9 ft) and weighing about 9 kg (20 lb), it spends much of its time in soaring flight visually seeking dead animals as food. The California condor has always been rare...
Conservation issues and strategies for elephant-shrews
G. B. Rathbun
1995, Mammal Review (25) 79-86
The recommendations and implementation of the IUCN conservation plan for African Insectivora and elephant-shrews (Nicoll & Rathbun, 1990) are reviewed. Of the 33 species and subspecies of elephant-shrews, only six forest-dwelling taxa are threatened. Until additional status data are gathered, assessed, and published no changes in the IUCN threatened categories...
The generation of oceanic rhyolites by crystal fractionation: the basalt-rhyolite association at Volcán Alcedo, Galápagos archipelago
Dennis Geist, Keith A. Howard, Peter Larson
1995, Journal of Petrology (36) 965-982
Alcedo volcano is one of six shield volcanoes on Isabela Island in the western Galápagos Islands. Although Alcedo is dominantiy basaltic, it is unusual in that it also has erupted ∼1 km3 of rhyolite. The rhyolitic phase marked a 10-fold decrease in the mass-eruption rate of the volcano, and the volcano...
Nutrients in ground water and surface water of the United States; an analysis of data through 1992
D. K. Mueller, P. A. Hamilton, D.R. Helsel, K.J. Hitt, B. C. Ruddy
1995, Water-Resources Investigations Report 95-4031
Historical data on nutrient (nitrogen and phosphorus species) concentrations in ground-and surface-water samples were compiled from 20 study units of the National Water-Quality Assessment (NAWQA) Program and 5 supplemental study areas. The resultant national retrospective data sets contained analyses of about 12,000 Found-water and more than 22,000 surface-water samples. These...
Regional rainfall-runoff relations for simulation of streamflow for watersheds in Lake County, Illinois
James J. Duncker, Tracy J. Vail, Charles S. Melching
1995, Water-Resources Investigations Report 95-4023
Rainfall and streamflow data collected in Lake County, Ill., from March 1990 through September 1993 were used to (1) calibrate a rainfall-runoff model for an area encompassing three watersheds (individual areas of 17.2, 35.7, and 37.0 mi2 (square miles) and (2) verify the regional model parameter set obtained from the calibration...
Trace metals and major and rare earth elements in cuttings from five high-temperature wells in the northwest region of The Geysers, California, vapor-dominated geothermal system
Robert O. Fournier, Joseph N. Moore
1995, Open-File Report 95-30
Temperatures within the main vapor-dominated steam reservoir at The Geysers geothermal field generally are in the range 238°C to 244°C. A few deep wells in the northwestern part of the field have penetrated beneath this reservoir into a second vapor-dominated reservoir where temperatures are >315°C, while vapor pressure remains nearly...
