Temporal and spatial patterns of wetland sedimentation, West Tennessee
C.R. Hupp, D.E. Bazemore
1993, Journal of Hydrology (141) 179-196
Dendrogeomorphic techniques were used to describe and interpret patterns of sedimentation rates at two forested wetland sites in West Tennessee. Fifty-five sampling stations were established along transects upstream and downstream from bridge structures, and 515 trees were examined for depth of sediment accretion and cored for age determination. Temporal variation...
Reply to comment by WI Rose
J. Fierstein, M. Nathenson
1993, Bulletin of Volcanology (55) 375-378
[No abstract available]...
Delayed Postglacial Uplift and Synglacial Sea Levels in Coastal Central New England
C. Koteff, Robinson Jr., R. Goldsmith, W.B. Thompson
1993, Quaternary Research (40) 46-54
The postglacial uplift pattern indicated by elevations of ice-marginal glaciomarine deltas in coastal New England, deposited between approximately 15,000 and 14,000 yr B.P. during ice retreat from northeastern Massachusetts into southwestern Maine, is very similar to that previously recorded for glaciolacustrine deltas of similar age from inland areas of New...
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...
Variation of froude number with discharge for large-gradient steams
Kenneth L. Wahl
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
Under chemical-control conditions, the Froude number (f) for a cross-section can be approximated as a function of the ratio R2/ 3/d 1/2 , where R is the hydraulic radius and d is the average depth. For cross sections where the ratio increases with increasing depth, F can also increase with...
Mapping debris-flow hazard in Honolulu using a DEM
Stephen D. Ellen, Robert K. Mark
Shen Hsieh WenSu S.T.Wen Feng, editor(s)
1993, Conference Paper, Proceedings - National Conference on Hydraulic Engineering
A method for mapping hazard posed by debris flows has been developed and applied to an area near Honolulu, Hawaii. The method uses studies of past debris flows to characterize sites of initiation, volume at initiation, and volume-change behavior during flow. Digital simulations of debris flows based on these characteristics...
Three dimensional images of geothermal systems: local earthquake P-wave velocity tomography at the Hengill and Krafla geothermal areas, Iceland, and The Geysers, California
B.R. Julian, A. Prisk, G.R. Foulger, J.R. Evans
Anon, editor(s)
1993, Conference Paper, Transactions - Geothermal Resources Council
Local earthquake tomography - the use of earthquake signals to form a 3-dimensional structural image - is now a mature geophysical analysis method, particularly suited to the study of geothermal reservoirs, which are often seismically active and severely laterally inhomogeneous. Studies have been conducted of the Hengill (Iceland), Krafla (Iceland)...
An extremely low UPb source in the Moon: U Th Pb, Sm Nd, Rb Sr, and 40Ar 39Ar isotopic systematics and age of lunar meteorite Asuka 881757
Keiji Misawa, M. Tatsumoto, G. B. Dalrymple, K. Yanai
1993, Geochimica et Cosmochimica Acta (57) 4687-4702
We have undertaken U Th Pb, Sm Nd, Rb Sr, and 40Ar39Ar">40Ar39Ar isotopic studies on Asuka 881757, a coarse-grained basaltic lunar meteorite whose chemical composition is close to low-Ti and very low-Ti (VLT) mare basalts. The Pb Pb internal isochron obtained for acid leached residues of...
Analysis of flow in an observation well intersecting a single fracture
P.A. Lapcevic, K.S. Novakowski, Frederick L. Paillet
1993, Journal of Hydrology (151) 229-239
A semi-analytical model is developed to determine transmissivity and storativity from the interpretation of transient flow in an observation well due to pumping in a source well where the two wells are connected by a single fracture. Flow rate can be determined using a heat-pulse flowmeter located above the intersection...
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...
Geology and genesis of the Baid Al Jimalah tungsten deposit, Kingdom of Saudi Arabia
R.J. Kamilli, J. C. Cole, J. E. Elliott, R.E. Criss
1993, Economic Geology (88) 1743-1767
The Baid al Jimalah tungsten deposit in Saudi Arabia (lat 25 degrees 09'N, long 42 degrees 41'E) consists predominantly of swarms of steeply dipping, subparallel, tungsten-bearing quartz veins and of less abundant, smaller stockwork veins. It is spatially, temporally, and genetically associated with a 569 Ma, highly differentiated, porphyritic, two-feldspar...
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,...
Heavy metal anomalies in the Tinto and Odiel River and estuary system, Spain
C.H. Nelson, P. J. Lamothe
1993, Estuaries (16) 496-511
The Tinto and Odiel rivers drain 100 km from the Rio Tinto sulphide mining district, and join at a 20-km long estuary entering the Atlantic Ocean. A reconnaissance study of heavy metal anomalies in channel sand and overbank mud of the river and estuary by semi-quantitative emission dc-arc spectrographic analysis...
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...
Diatom zonation in southern Oregon tidal marshes relative to vascular plants, foraminifera, and sea level
A.R. Nelson, K. Kashima
1993, Journal of Coastal Research (9) 673-697
Diatom assemblages across estuarine marshes show a three-part vertical ecologic zonation of the intertidal zone similar to zonations of foraminiferal and vascular plant assemblages. Gradual changes in the compositions of all three types of assemblages reflect gradational zone boundaries, 5-40m wide. Modern mudflat, low marsh, and high marsh zones can...
Management and analysis of water-use data using a geographic information system
K. E. Juracek, J. F. Kenny
1993, Water Resources Bulletin (29) 973-979
As part of its mission, the U.S. Geological Survey conducts water-resources research. Site-specific and aggregate water-use data are used in the Survey's National Water-Use Information Program and in various hydrologic investigations. Both types of activities have specific requirements in terms of water-use data access, analysis, and display. In Kansas, the...
Neogene folding and faulting in southern Monterey Bay, Central California, USA
J. M. Gardner-Taggart, H. Gary Greene, M.T. Ledbetter
1993, Marine Geology (113) 163-177
The goal of this study was to determine the Neogene structural history of southern Monterey Bay by mapping and correlating the shallow tectonic structures with previously identified deeper occurring structures. Side scan sonographs and Uniboom seismic reflection profiles collected in the region...
Aquatic photolysis: photolytic redox reactions between goethite and adsorbed organic acids in aqueous solutions
M. C. Goldberg, K.M. Cunningham, Eugene R. Weiner
1993, Journal of Photochemistry and Photobiology A: Chemistry (73) 105-120
Photolysis of mono and di-carboxylic acids that are adsorbed onto the surface of the iron oxyhydroxide (goethite) results in an oxidation of the organic material and a reduction from Fe(III) to Fe(II) in the iron complex. There is a subsequent release of Fe2+ ions into solution. At constant light flux...
Beach profile modification and sediment transport by ice: an overlooked process on Lake Michigan
P. W. Barnes, E. W. Kempema, E. Reimnitz, M. McCormick, W. S. Weber, E.C. Hayden
1993, Journal of Coastal Research (9) 65-86
Coastal lake ice includes a belt of mobile crash and slush ice and a stable nearshore-ice complex (NIC). Sediment concentrations indicate that the NIC and the belt of brash and slush contains 180 to 280 t (113 to 175m3) of sand per kilometer of coast. This static sediment load is...
Assessing the paradigm of mutually exclusive erosion and deposition of mud, with examples from upper Chesapeake Bay
L.P. Sanford, J.P. Halka
1993, Marine Geology (114) 37-57
A paradigm of cohesive sediment transport research is that erosion and deposition are mutually exclusive. Many laboratory studies have shown that there is a velocity/stress threshold below which erosion does not occur and a lower threshold above which deposition does not occur....
Evaluation of the energy budget method of determining evaporation at Williams Lake, Minnesota, using alternative instrumentation and study approaches
D.O. Rosenberry, A.M. Sturrock, T. C. Winter
1993, Water Resources Research (29) 2473-2483
Best estimates of evaporation at Williams Lake, north central Minnesota, were determined by the energy budget method using optimum sensors and optimum placement of sensors. These best estimates are compared with estimates derived from using substitute data to determine the effect of using less accurate sensors, simpler methods, or remotely...
The analysis of forms of sulfur in ancient sediments and sedimentary rocks: comments and cautions
C. A. Rice, M. L. Tuttle, R. L. Reynolds
1993, Chemical Geology (107) 83-95
Assumptions commonly made during analysis of the amount of monosulfides [acid-volatile sulfides (AVS)] and disulfides in modern sediments, may not be valid for ancient sedimentary rocks. It is known that ferric iron can oxidize H2S during AVS analysis unless a reducing agent such as stannous chloride is added to the...
Anadromous fish behavior important for fish passage
B. Kynard
1993, Canadian Technical Report of Fisheries and Aquatic Sciences (1905) 95-105
Volumetric calculations in an oil field: The basis method
Ricardo A. Olea, V. Pawlowsky, J.C. Davis
1993, Computers & Geosciences (19) 1517-1527
The basis method for estimating oil reserves in place is compared to a traditional procedure that uses ordinary kriging. In the basis method, auxiliary variables that sum to the net thickness of pay are estimated by cokriging. In theory, the procedure should be more powerful because it makes full use...
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...
