U-Pb isotope systematics and apparent ages of uranium ores, Ambrosia Lake and Smith Lake districts, Grants mineral belt, New Mexico
K.R. Ludwig, K. R. Simmons, J.D. Webster
1984, Economic Geology (79) 322-337
Orebodies occur in continental sandstones of the Upper Jurassic Morrison Formation and comprise two main types of mineralization; primary ore formed early in the history of the host rock and resulted in tabular, peneconcordant orebodies rich in organic material; redistributed ore apparently was formed by oxidative destruction and reconcentration of...
Volcanic studies at the David A. Johnston Cascades Volcano Observatory.
S. Brantley
1984, Earthquake Information Bulletin (USGS) (16) 44-51
Banded iron-formations of late Proterozoic age in the central eastern desert, Egypt: Geology and tectonic setting
P.K. Sims, H. L. James
1984, Economic Geology (79) 1777-1784
In the central Eastern Desert of Egypt, deposits of iron-formation of the Algoma type occur as sharply defined stratigraphic units within layered volcanogenic rocks of late Proterozoic age. The volcanic sequence is characterized by interfingering and repetition of rocks of dominantly andesite-basalt composition and by tectonically juxtaposed ophiolitelike assemblages; it...
Geochemical data for samples of rock, stream sediment, and nonmagnetic heavy-mineral concentrate from the Tunnel Ridge Wilderness Study Area, Klamath Mountains, California
M. F. Diggles, G. L. Kennedy, D.E. Detra, J. D. Sharkey
1984, Open-File Report 84-887
No abstract available....
Mineral resources of the North Algodones Dunes Wilderness Study Area (CDCA-360), Imperial County, California
R. S. U. Smith, W. E. Yeend, J. C. Dohrenwend, D. D. Gese
1984, Open-File Report 84-630
No abstract available....
A comparison of iron oxide-rich joint coatings and rock chips as geochemical sampling media in exploration for disseminated gold deposits
W. Crone, L.T. Larson, R.H. Carpenter, T. T. Chao, R. F. Sanzolone
1984, Journal of Geochemical Exploration (20) 161-178
We evaluated the effectiveness of iron oxide-rich fracture coatings as a geochemical sampling medium for disseminated gold deposits, as compared with conventional lithogeochemical methods, for samples from the Pinson mine and Preble prospect in southeastern Humboldt County, Nevada. That disseminated gold mineralization is associated with Hg, As, and Sb is...
The toxicity of chlorine to a common vascular aquatic plant
C.H. Watkins, R.S. Hammerschlag
1984, Water Research (18) 1037-1043
Myriophyllum spicatum was exposed to various chlorine concentrations on a continuous and intermittent basis in 96-h toxicity studies utilizing a proportional diluter. Continuous exposure to chlorine concentrations as low as 0.05 mg l−1 total residual chlorine (TRC) depressed shoot and total plant dry weights approx. 30% relative to controls. Shoot length was...
Contaminants
Wayne A. Willford
1984, Technical Report 40
No abstract available....
Photosynthetic characteristics of certain vernal pool species
Jon E. Keeley
1984, Book chapter, Vernal Pools and Intermittent Streams
No abstract available at this time...
Wildlife census in the southern Cottonwood Mountains, Death Valley National Monument I
C. L. Douglas, P.G. Sanchez
1984, Technical Report CPSU/UNLV 006/30
No abstract available at this time...
Wildlife census in the southern Cottonwood Mountains, Death Valley National Monument II
C. L. Douglas, P.G. Sanchez
1984, Technical Report CPSU/UNLV 006/31
No abstract available at this time...
San Agustin Plains, New Mexico: Age and paleoenvironmental potential reassessed
Vera Markgraf, J.P. Bradbury, R. M. Forester, G. Singh, R.S. Sternberg
1984, Quaternary Research (22) 336-343
Paleomagnetic analysis of samples from the original 600-m-long core from the San Agustin Plains, New Mexico, showed an unquestionable reversal stratigraphy dating the record back to at least 1.6 my. Analysis of pollen, ostracodes, and algae of a duplicate sample section in the vicinity of the original coring site and...
Fire suppression effects on fuels and succession in short fire interval wilderness ecosystems
J. W. van Wagtendonk
1984, General Technical Report INT-182
No abstract available at this time...
Bonded-phase extraction column isolation of organic compounds in groundwater at a hazardous waste site
C.E. Rostad, W. E. Pereira, S.M. Ratcliff
1984, Analytical Chemistry (56) 2856-2860
A procedure for isolation of hazardous organic compounds from water for gas chromatography/mass spectrometry analysis Is presented and applied to creosote- and pentachlorophenol-contaminated groundwater resulting from wood-treatment processes. This simple procedure involved passing a 50-100-mL sample through a bonded-phase extraction column, eluting the trapped organic compounds from the column with...
Ferromanganese crust resources in the Pacific and Atlantic Oceans
R.F. Commeau, A. Clark, Chad Johnson, F.T. Manheim, P. J. Aruscavage, C.M. Lane
1984, Conference Paper, Oceans '84 : Conference record : Industry, government, education - Designs for the future
Ferromanganese crusts on raised areas of the ocean floor have joined abyssal manganese nodules and hydrothermal sulfides as potential marine resources. Significant volumes of cobalt-rich (about 1% Co) crusts have been identified to date within the US Exclusive Economic Zone (EEZ) in the Central Pacific: in the NW Hawaiian Ridge...
The isotope systematics of a juvenile intraplate volcano: Pb, Nd, and Sr isotope ratios of basalts from Loihi Seamount, Hawaii
H. Staudigel, A. Zindler, S.R. Hart, T. Leslie, C.-Y. Chen, D. Clague
1984, Earth and Planetary Science Letters (69) 13-29
Sr, Nd, and Pb isotope ratios for a representative suite of 15 basanites, alkali basalts, transitional basalts and tholeiites from Loihi Seamount, Hawaii, display unusually large variations for a single volcano, but lie within known ranges for Hawaiian basalts. Nd isotope...
Archaeological sedimentology of overbank silt deposits on the floodplain of the Ohio River near Louisville, Kentucky
H.H. Gray
1984, Journal of Archaeological Science (11) 421-432
The surface of the floodplain of the Ohio River about 20km southwest of Louisville, Kentucky, is a series of linear ridges and swales that are subparallel to the channel of the river, which here is relatively straight and flows southward. Numerous prehistoric occupational sites are located on these ridges. The...
Lu-Hf constraints on the evolution of lunar basalts
Hirokazu Fujimaki, Mistunobu Tatsumoto
1984, Journal of Geophysical Research Solid Earth (89) B445-B458
Very low Ti basalts and green glass samples from the moon show high Lu/Hf ratios and low Hf concentrations. Low-Ti lunar basalts show high and variable Lu/Hf ratios and higher Hf concentrations, whereas high-Ti lunar basalts show low Lu/Hf ratios and high Hf concentrations. KREEP basalts have constant Lu/Hf ratios...
The occurance of Pterygodermatites nycticebi (Nematoda: Rictulariidae) in a captive slow loris, Nycticebus coucang
B.N. Tuggle, B.A. Beehler
1984, Proceedings of the Helminthological Society of Washington (51) 162-163
Adult and immature rictulariid nematodes were recovered at necropsy from the small intestine of an adult slow loris, Nycticebus coucang, from the Milwaukee County Zoo in Wisconsin. The lumen of the entire small intestine was packed with more than 100 nematodes, the intestinal wall appeared thickened and the mucosal surface...
Factors determining desert dune type
D. M. Rubin
1984, Nature (309) 91-92
[No abstract available]...
Magmatic inclusions in rhyolites, contaminated basalts, and compositional zonation beneath the Coso volcanic field, California
C. R. Bacon, J. Metz
1984, Contributions to Mineralogy and Petrology (85) 346-365
Basaltic lava flows and high-silica rhyolite domes form the Pleistocene part of the Coso volcanic field in southeastern California. The distribution of vents maps the areal zonation inferred for the upper parts of the Coso magmatic system. Subalkalic basalts (<50% SiO2) were erupted well away from the rhyolite field...
Chemical determination of particulate nitrogen in San Francisco Bay. A comparison of two estimates
S.W. Hager, D.D. Harmon
1984, Estuarine, Coastal and Shelf Science (19) 181-191
Particulate nitrogen was measured by both the ultra-violet light-catalyzed peroxide method and the high temperature combustion method. The difference between values obtained with the two methods (combustion minus UV) was found to be linearly correlated with the concentration of total suspended particulate matter (SPM) in the sample. The slope of...
Periodic jökulhlaups from Pleistocene glacial Lake Missoula-New evidence from varved sediment in northern Idaho and Washington
Richard B. Waitt
1984, Quaternary Research (22) 46-58
Newly examined exposures in northern Idaho and Washington show that catastrophic floods from glacial Lake Missoula during late Wisconsin time were repeated, brief jökulhlaups separated by decades of quiet glaciolacustrine and subaerial conditions. Glacial Priest Lake, dammed in the Priest River valley by a tongue of the Purcell trench lobe...
Lead poisoning of sandhill cranes (Grus canadensis)
R. M. Windingstad, S.M. Kerr, L. N. Locke, J. J. Hurt
1984, Prairie Naturalist (16) 21-24
Two wild and two captive sandhill cranes (Grus canadensis) were diagnosed by National Wildlife Health Laboratory personnel as having died from lead toxicity. Ingestion of lead fishing weights by the wild cranes and of unspent .22 caliber shell cartridges by the captive cranes were responsible for these deaths. One crane...
Fluid heterogeneity during granulite facies metamorphism in the Adirondacks: stable isotope evidence
J.W. Valley, J. R. O’Neil
1984, Contributions to Mineralogy and Petrology (85) 158-173
The preservation of premetamorphic, whole-rock oxygen isotope ratios in Adirondack metasediments shows that neither these rocks nor adjacent anorthosites and gneisses have been penetrated by large amounts of externally derived, hot CO2-H2O fluids during granulite facies metamorphism. This conclusion is supported by calculations of the effect of fluid volatilization and...
