Middle Devonian to Late Mississippian event stratigraphy of Overthrust belt region, western United States
Charles Sandberg, R.C. Gutschick, J.G. Johnson, F. G. Poole, W.J. Sando
1986, Annales - Societe Geologique de Belgique (109) 205-207
Twenty eustatic and epeirogenic events mainly dated by conodonts are distinguished between the Middle Devonian and the lower Upper Mississippian in Great Basin, in Rocky Mountains and in the Overthrust belt regions....
Resurgence of submersed aquatic macrophytes in the tidal Potomac River, Maryland, Virginia, and the District of Columbia
V. Carter, N. Rybicki
1986, Estuaries (9) 368-375
A 1978–81 survey of submersed aquatic macrophytes in the tidal Potomac River showed that there were virtually no plants in the freshwater tidal river between Chain Bridge and Quantico, Virginia, decades after the disappearance of plants in the late 1930’s. Plant populations were monitored in subsequent years (1983–85) using qualitative...
THERMAL-ENERGY STORAGE IN A DEEP SANDSTONE AQUIFER IN MINNESOTA: FIELD OBSERVATIONS AND THERMAL ENERGY-TRANSPORT MODELING.
R. T. Miller
1986, Conference Paper, Proceedings of the Intersociety Energy Conversion Engineering Conference
A study of the feasibility of storing heated water in a deep sandstone aquifer in Minnesota is described. The aquifer consists of four hydraulic zones that are areally anisotropic and have average hydraulic conductivities that range from 0. 03 to 1. 2 meters per day. A preliminary axially symmetric, nonisothermal,...
Upper mantle structure from teleseismic P wave arrivals in Washington and northern Oregon
C. A. Michaelson, C.S. Weaver
1986, Journal of Geophysical Research Solid Earth (91) 2077-2094
Teleseismic P wave travel time residuals are used to detect lateral velocity heterogeneities in the upper mantle beneath Washington and northern Oregon. The results of an inversion for three-dimensional velocity variations resolves an east dipping high-velocity zone that we interpret as the subducting Juan de Fuca plate. The plate is characterized by...
Lead-isotopic data from sulfide minerals from the Cascade Range, Oregon and Washington
S. E. Church, A.P. LeHuray, A.R. Grant, M.H. Delevaux, J. E. Gray
1986, Geochimica et Cosmochimica Acta (50) 317-328
Lead-isotopic studies of mineral deposits associated with Tertiary plutons found in the Cascade Range of Oregon and Washington demonstrate a rather uniform isotopic composition in various sulfide minerals (206Pb204Pb= 18.84 to 19.05">206Pb204Pb= 18.84 to 19.05; 207Pb204Pb= 15.57 to 15.62">207Pb204Pb=...
Identifying hydraulically conductive fractures with a slow-velocity borehole flowmeter
Alfred E. Hess
1986, Canadian Geotechnical Journal (23) 69-78
The U.S. Geological Survey used a recently developed heat-pulse flowmeter to measure very slow borehole axial water velocities in granitic rock at a site near Lac du Bonnet, Manitoba, Canada. The flowmeter was used with other geophysical measurements to locate and identify hydraulically conducting fractures contributing to the very slow...
The modification of an estuary
F.H. Nichols, James E. Cloern, Samuel N. Luoma, D. H. Peterson
1986, Science (231) 567-573
The San Francisco Bay estuary has been rapidly modified by human activity. Diking and filling of most of its wetlands have eliminated habitats for fish and waterfowl; the introduction of exotic species has transformed the composition of its aquatic communities; reduction of freshwater inflow by more than half has changed...
Influences of quaternary climatic changes on processes of soil development on desert loess deposits of the Cima volcanic field, California
L. D. McFadden, S. G. Wells, J. C. Dohrenwend
1986, Catena (13) 361-389
Soils formed in loess are evidence of both relict and buried landscapes developed on Pliocene-to-latest Pleistocene basalt flows of the Cima volcanic field in the eastern Mojave Desert, California. The characteristics of these soils change systematically and as functions of the age and surface morphology of the lava flow. Four...
Crater Lake, Oregon: A restricted basin with base-of-slope aprons of nonchannelized turbidites
C.H. Nelson, A.W. Meyer, D. Thor, M. Larsen
1986, Geology (14) 238-241
The basin floor of Crater Lake (10-km diameter, 600-m water depth) is covered by up to 75 m of sediment–gravity-flow deposits interbedded with mud. In the upper units (8 m (thick), sand and gravel layers with numerous wedging, strong seismic reflectors characterize the...
Summation of Quaternary glaciations in the United States of America
G.M. Richmond, D. S. Fullerton
1986, Quaternary Science Reviews (5) 183-196
[No abstract available]...
A united physicochemical description of the protonation and metal ion complexation equilibria of natural organic acids (humic and fulvic acids). 2. Influence of polyelectrolyte properties and functional group heterogeneity on the protonation equilibria of fulvic acid
J. Ephraim, S. Alegret, A. Mathuthu, M. Bicking, Ronald L. Malcolm, J.A. Marinsky
1986, Environmental Science & Technology (20) 354-366
No abstract available....
Image mapping with the Thematic Mapper.
A. P. Colvocoresses
1986, Photogrammetric Engineering and Remote Sensing (52) 1499-1505
This paper deals principally with Landsat Thematic Mapper (TM) image maps as published by the US Geological Survey (USGS). Landsat data have certain characteristics that make them suitable for conversion into image maps. These characteristics involve 1) spatial resolution, 2) geometric fidelity, and 3) spectral response. This paper analyzes the...
A finite element model for tidal and residual circulation
Roy A. Walters
1986, Communications in Numerical Methods in Engineering (2) 393-398
Harmonic decomposition is applied to the shallow water equations, thereby creating a system of equations for the amplitude of the various tidal constituents and for the residual motions. The resulting equations are elliptic in nature, are well posed and in practice are shown to be numerically well-behaved. There are a...
Nd-Sr-Pb isotope constraints on the sources of west Maui volcano, Hawaii
E. Hegner, D. Unruh, M. Tatsumoto
1986, Nature (319) 478-480
The origin of the Emperor-Hawaiian volcanic chain is attributed to the northwesterly movement of the Pacific plate over a stationary mantle plume (hotspot)1. There has been considerable controversy as to the nature and number of sources of Hawaiian hotspot volcanism. Thus far, most geochemical models have been based on rock...
Zimbabweite, a new alkali-lead arsenic tantalate from St Anns mine, Karoi district, Zimbabwe
Eugene E. Foord, Joseph E. Taggart, R. V. Gaines, P. L .C. Grubb, R. Kristiansen
1986, Bulletin de Mineralogie (109) 331-336
Zimbabweite (Na,K)2PbAs4(Ta,Nb,Ti)4O18, a new mineral with trivalent arsenic, has been recognized at St Anns mine, southeast of Miami, Karoi district, Zimbabwe, in kaolinized pegmatite and dump material.The mineral is honey yellow-brown in large crystals, which are as much as 1 x 1 x 2 cm, and is clear pale yellow...
Cyclic terpenoids of contemporary resinous plant detritus and of fossil woods, ambers and coals
Bernd R. T. Simoneit, J.O. Grimalt, T.-G. Wang, R.E. Cox, Patrick G. Hatcher, A. Nissenbaum
1986, Organic Geochemistry (10) 877-889
Cyclic terpenoids present in the solvent extractable material of fossil woods, ambers and brown coals have been analyzed. The sample series chosen consisted of wood remains preserved in Holocene to Jurassic sediments and a set of of ambers from the Philippines (copalite), Israel, Canada and Dominican Republic. The brown coals...
BROAD SPECTRUM ANALYSIS FOR TRACE ORGANIC POLLUTANTS IN LARGE VOLUMES OF WATER BY XAD RESINS-COLUMN DESIGN-FACTS AND MYTHS.
J. Gibs, A. Wicklund, I.H. Suffet
1986, Conference Paper, National Meeting - American Chemical Society, Division of Environmental Chemistry
The 'rule of thumb' that large volumes of water can be sampled for trace organic pollutants by XAD resin columns which are designed by small column laboratory studies or pure compounds is examined and shown to be a problem. A theory of multicomponent breakthrough is presented as a frame of...
Late Triassic paleogeography of the southern Cordillera: The problem of a source for voluminous volcanic detritus in the Chinle Formation of the Colorado Plateau region
John H. Stewart, T.H. Anderson, G.B. Hazel, L. T. Silver, J.E. Wright
1986, Geology (14) 567-570
The Upper Triassic Chinle Formation of the Colorado Plateau contains voluminous volcanic detritus evidently derived from a source to the south. Volcanic rocks exposed in southern Arizona and northern Sonora have been assumed to represent this source terrane, but U-Pb isotopic geochronology and...
Downstream effects of Flaming Gorge Reservoir on the Green River, Colorado and Utah
E.D. Andrews
1986, Geological Society of America Bulletin (97) 1012-1023
The Green River is one of the principal tributaries in the Colorado River basin and drains 44,700 m2 in Wyoming, Colorado, and Utah. Since October 1962, flows of the Green River have been regulated by Flaming Gorge Reservoir, which is located 412 river miles upstream from its confluence with the Colorado...
Contrasting magma types and steady-state, volume-predictable, basaltic volcanism along the Great Rift, Idaho
M. A. Kuntz, D.E. Champion, E.C. Spiker, R.H. Lefebvre
1986, Geological Society of America Bulletin (97) 579-594
The Great Rift is an 85-km-long, 2- to 8-km-wide volcanic rift zone in the Snake River Plain, Idaho. Three latest Pleistocene to Holocene basaltic lava fields, Craters of the Moon, Kings Bowl, and Wapi, are located along the Great Rift. The Craters of...
Platinum-group element resources in podiform chromitites from California and Oregon
N.J. Page, D.A. Singer, B. C. Moring, C.A. Carlson, J.M. McDade, S. A. Wilson
1986, Economic Geology (81) 1261-1271
Rock samples from about 280 podiform chromite deposits in California and Oregon were analyzed for Pt, Pd, Rh, and Ir by fire assay-atomic absorption and spectrographic techniques to estimate by-product platinum-group element potential of chromite mining. These deposits include ophiolites from the Sierra...
HYDRODYNAMIC SIMULATION OF THE UPPER POTOMAC ESTUARY.
Raymond W. Schaffranck
1986, Conference Paper
Hydrodynamics of the upper extent of the Potomac Estuary between Indian Head and Morgantown, Md. , are simulated using a two-dimensional model. The model computes water-surface elevations and depth-averaged velocities by numerically integrating finite-difference forms of the equations of mass and momentum conservation using the alternating direction implicit method. The...
Borehole field calibration and measurement of low-concentration manganese by decay gamma rays
J.L. Mikesell, F. E. Senftle, T.A. Lloyd, A.B. Tanner, C.T. Merritt, E. R. Force
1986, Geophysics (51) 2219-2224
The manganese concentration in the Arundel clay formation, Prince Georges County, Maryland, was determined from a borehole by using delayed neutron activation. The neutrons were produced by a 100 mu g 252 Cf source. The 847 keV gamma ray of manganese was detected continuously, and its counting rate was measured at intervals...
Solid and fluid inclusions in mantle xenoliths: An analytical dilemma?
J.S. Noller
1986, Geology (14) 437-440
Two Cr-diopside Iherzolite xenoliths with kaersutite selvages, from Dish Hill, California, contain four types of solid and fluid inclusions that can be used to discriminate between actual mantle processes and processes acting upon a fragment of mantle as it is entrained and carried to the earth surface. On the basis...
Movement and fate of detergents in groundwater: A field study
E.M. Thurman, L.B. Barber Jr., D. LeBlanc
1986, Journal of Contaminant Hydrology (1) 143-161
The major cations, anions, and detergents in a plume of contaminated groundwater at Otis Air Base on Cape Cod (Mass., U.S.A.) have moved approximately 3.5 km down gradient from the disposal beds. We hypothesize that the detergents form two distinct plumes, which consist of alkyl benzene sulfonates (ABS) detergents and...
