Edoylerite, Hg32+Cr6+O4S2 a new mineral from the Clear Creek claim, San Benito County, California
Richard C. Erd, Andrew C. Roberts, M. Bonardi, A.J. Criddle, Page Y. Le, E.J. Gabe
1993, Mineralogical Record (24) 471-475
Edoylerite is a rare constituent of a small prospect near the long-abandoned Clear Creek mercury mine, New Idria district, San Benito County, California. It is most closely associated with cinnabar, from which it is a primary alteration product, in a host rock composed predominantly of quartz, chalcedony and ferroan magnesite....
Thermal budget of the lower east rift zone, Kilauea Volcano
Paul T. Delaney, Wendell A. Duffield, John H. Sass, James P. Kauahikaua
Anon, editor(s)
1993, Conference Paper, Transactions - Geothermal Resources Council
The lower east rift zone of Kilauea has been the site of repeated fissure eruptions fed by dikes that traverse the depths of interest to geothermal explorations. We find that a hot-rock-and-magma system of low permeability extending along the rift zone at depths below about 4 km and replenished with...
Water-level, velocity, and dye measurements in the Chicago tunnels
K. A. Oberg, A.R. Schmidt
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
On April 13, 1992, a section of a 100-year-old underground freight tunnel in downtown Chicago, Illinois was breached where the tunnel crosses under the Chicago River, about 15 meters below land surface. The breach allowed water from the Chicago River to flow into the freight tunnels and into buildings connected...
Conductive heat transfer from an isothermal magma chamber and its application to the measured heat flow distribution from mount hood, Oregon
Menuel Nathenson, Robert I. Tilling
Anon, editor(s)
1993, Conference Paper, Transactions - Geothermal Resources Council
A steady-state solution for heat transfer from an isothermal, spherical magma chamber, with an imposed regional geothermal gradient far from the chamber, is developed. The extensive published heat-flow data set for Mount Hood, Oregon, is dominated by conductive heat transfer in the deeper parts of most drill holes and provides...
The erosion of carbonate stone by acid rain: Laboratory and field investigations
P. A. Baedecker, M.M. Reddy
1993, Journal of Chemical Education (70) 104-108
One of the goals of research on the effects of acidic deposition on carbonate stone surfaces is to define the incremental impact of acidic deposition relative to natural weathering processes on the rate of carbonate stone erosion. If rain that impacts carbonate stone surfaces is resident on the surface long...
Miocene non-marine diatoms from the western Cordillera basins of northern Peru
Elisabeth Fourtainer, F. Gasse, O. Bellier, M. G. Bonhomme, I. Robles
1993, Diatom Research (8) 13-30
Diatom assemblages are documented from diatomite layers of two Miocene fluvio-lacustrine units from the basins of the western Cordillera of northern Peru: the Namora Formation and the Cajabamba Formation. Emphasis is given to taxa of particular stratigraphic interest. The diatom assemblages indicate for the Namora Formation the occurrence of swampy...
Evaluation of 55Fe as a tracer of Fe(III) reduction in aquatic sediments
E. E. Roden, Derek R. Lovley
1993, Geomicrobiology Journal (11) 49-56
The potential utility of 55Fe as a tracer for Fe(III) reduction in aquatic sediments was evaluated using freshwater sediments from the Potomac River, Md, in which Fe(III) reduction was the predominant terminal electron accepting process. In laboratory incubations of sediments amended with poorly crystalline 55Fe(III) oxide, the accumulation of 55Fe in Fe(II) over...
Thermodynamic evaluation and restoration of volcanic gas analyses: An example based on modern collection and analytical methods
Terrance M. Gerlach
1993, Geochemical Journal (27) 305-322
Thermodynamic evaluation and restoration procedures are applied to a set of 10 volcanic gas analyses obtained by modern collection and analytical methods. The samples were collected from a vigorously fuming fissure during episode 1 of the Puu Oo eruption of Kilauea Volcano in 1983. A variety of analytical techniques were...
Mesozoic stratigraphy and paleoenvironments of the Exxon 975-1 well, US North Atlantic shelf
L.J. Poppe, C. W. Poag
1993, Northeastern Geology (15) 200-209
The Exxon 975-1 well, located in the southeastern part of the Georges Bank Basin, was drilled to a total depth of 4452 m relative to the Kelly Bushing. About 6860 m of sedimentary rocks overlie the Paleozoic basement at the Exxon 975-1 wellsite. The Jurassic/Cretaceous boundary in the well is...
Assessment and prediction of debris-flow hazards
Gerald F. Wieczorek
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
Study of debris-flow geomorphology and initiation mechanism has led to better understanding of debris-flow processes. This paper reviews how this understanding is used in current techniques for assessment and prediction of debris-flow hazards....
Time-dependent landslide probability mapping
Russell H. Campbell, Richard L. Bernknopf
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
Case studies where time of failure is known for rainfall-triggered debris flows can be used to estimate the parameters of a hazard model in which the probability of failure is a function of time. As an example, a time-dependent function for the conditional probability of a soil slip is estimated...
Reduction of uranium by cytochrome c3 of Desulfovibrio vulgaris
Derek R. Lovley, P.K. Widman, J.C. Woodward, Elizabeth J.P. Phillips
1993, Applied and Environmental Microbiology (59) 3572-3576
The mechanism for U(VI) reduction by Desulfovibrio vulgaris (Hildenborough) was investigated. The H2-dependent U(VI) reductase activity in the soluble fraction of the cells was lost when the soluble fraction was passed over a cationic exchange column which extracted cytochrome c3. Addition of cytochrome c3 back to the soluble fraction that...
A brief history of the American radium industry and its ties to the scientific community of its early twentieth century
E. R. Landa
1993, Environment International (19) 503-508
Federally funded remedial action projects are presently underway in New Jersey and Colorado at sites containing 226Ra and other radionuclides from radium-uranium ore extraction plants that operated during the early twentieth century. They are but the latest chapter in the story of an American industry that emerged and perished in...
Accessory minerals and subduction zone metasomatism: a geochemical comparison of two mélanges (Washington and California, U.S.A.)
Sorena S. Sorensen, Jeffrey N. Grossman
1993, Chemical Geology (110) 269-297
The ability of a subducted slab or subducted sediment to contribute many incompatible trace elements to arc source regions may depend on the stabilities of accessory minerals within these rocks, which can only be studied indirectly. In contrast, the role of accessory minerals in lower-T and -P metasomatic processes...
Isotopic and trace-element constraints on mantle and crustal contributions to Siberian continental flood basalts, Noril'sk area, Siberia
J. L. Wooden, G.K. Czamanske, V.A. Fedorenko, N.T. Arndt, C. Chauvel, R. M. Bouse, B. S. W. King, R. J. Knight, D. F. Siems
1993, Geochimica et Cosmochimica Acta (57) 3677-3704
We present a tightly controlled and comprehensive set of analytical data for the 250-Ma Siberian flood-basalt province. Consideration of major- and trace-element compositions, along with strontium, lead and neodymium isotopic compositions, strongly supports earlier Russian subdivision of this magmatism into three magmatic cycles, giving rise to three assemblages of eleven...
Chronology, Eruption Duration, and Atmospheric Contribution of the Martian Volcano Apollinaris Patera
M.S. Robinson, P. J. Mouginis-Mark, J. R. Zimbelman, S.S.C. Wu, K.K. Ablin, A. E. Howington-Kraus
1993, Icarus (104) 301-323
Geologic mapping, thermal inertia measurements, and an analysis of the color (visual wavelengths) of the martian volcano Apollinaris Patera indicate the existence of two different surface materials, comprising an early, easily eroded edifice, and a more recent, competent fan on the southern flank. A chronology of six major events that...
Oblique synoptic images, produced from digital data, display strong evidence of a "new" caldera in southwestern Guatemala
W. Duffield, G. Heiken, D. Foley, A. McEwen
1993, Journal of Volcanology and Geothermal Research (55) 217-224
The synoptic view of broad regions of the Earth's surface as displayed in Landsat and other satellite images has greatly aided in the recognition of calderas, ignimbrite plateaus and other geologic landforms. Remote-sensing images that include visual representation of depth are an even more powerful tool for geologic interpretation of...
Ikaite precipitation by mixing of shoreline springs and lake water, Mono Lake, California, USA
J. L. Bischoff, S. Stine, R.J. Rosenbauer, J.A. Fitzpatrick, Thomas W. Stafford Jr.
1993, Geochimica et Cosmochimica Acta (57) 3855-3865
Metastable ikaite (CaCO3·6H2O) forms abundantly during winter months along the south shoreline of Mono Lake where shoreline springs mix with lake water. Ikaite precipitates because of its decreased solubility at low temperature and because of orthophosphate-ion inhibition of calcite and aragonite. During the spring some of the ikaite is transformed...
Reference surfaces for bridge scour depths
Mark N. Landers, David S. Mueller
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
Depth of scour is measured as the vertical distance between scoured channel geometry and a measurement reference surface. A scour depth measurement can have a wide range depending on the method used to establish the reference surface. A consistent method to establish reference surfaces for bridge scour measurements is needed...
Tectonic characterization of a potential high-level nuclear waste repository at Yucca Mountain, Nevada
John W. Whitney, Dennis W. O’Leary
1993, Conference Paper, Dynamic Analysis and Design Considerations for High-Level Nuclear Waste Repositories
Tectonic characterization of a potential high-level nuclear waste repository at Yucca Mountain, Nevada, is needed to assess seismic and possible volcanic hazards that could affect the site during the preclosure (next 100 years) and the behavior of the hydrologic system during the postclosure (the following 10,000 years) periods. Tectonic characterization...
Red River of the North Basin, Minnesota, North Dakota, and South Dakota
Jeffrey D. Stoner, David L. Lorenz, Gregg J. Wiche, Robert M. Goldstein
1993, Water Resources Bulletin (29) 575-615
This report describes the physical, chemical, and aquatic-biological characteristics that could affect regional water quality in the Red River of the North study unit. These characteristics define the overall environmental setting of the study unit. This report provides base line and historical information for future reports that will address specific...
Sedimentary sulfur geochemistry of the Paleogene Green River Formation, western USA: Implications for interpreting depositional and diagenetic processes in saline alkaline lakes
M. L. Tuttle, M. B. Goldhaber
1993, Geochimica et Cosmochimica Acta (57) 3023-3039
The sulfur geochemistry of the lacustrine Paleogene Green River Formation (Colorado, Utah, and Wyoming, USA) is unlike that of most marine and other lacustrine rocks. Distinctive chemical, isotopic, and mineralogical characteristics of the formation are pyrrhotite and marcasite, high contents of iron mineral sulfides strikingly enriched in34S, cyclical trends in...
Assessing the effect of pesticides in agricultural runoff on aquatic life in the Sangamon River near Monticello, Illinois
R.H. Coupe, M.S. Henebry, M.R. Branham
H. Olem, editor(s)
1993, Water Science and Technology (28) 569-573
Stream-water samples collected from a midwest stream, following a thunderstorm during May 1991 were toxic to water fleas (Ceriodaphnia dubia), but not fathead minnows (Pimephales promelas), or a bacterium (Photobacterium phosphoreum) or green alga (Selenastrum capricornutum). It was unlikely that the toxicity to the water fleas was caused by herbicides,...
New methods to characterize site amplification
Erdal Safak
1993, Conference Paper, Structural Engineering in Natural Hazards Mitigation
Methods alternative to spectral ratios are introduced to characterize site amplification. The methods are developed by using a range of models, from the simple constant amplification model to the time-varying filter model. Examples are given for each model by using a pair of rock- and soil-site recordings from the Loma...
Crude oil in a shallow sand and gravel aquifer-II. Organic geochemistry
R.P. Eganhouse, M.J. Baedecker, I.M. Cozzarelli, G. R. Aiken, K. A. Thorn, T.F. Dorsey
1993, Applied Geochemistry (8) 551-567
Crude oil spilled from a pipeline break in a remote area of north-central Minnesota has contaminated a shallow glacial outwash aquifer. Part of the oil was sprayed over a large area to the west of the pipeline and part of it accumulated...
