Reply. Melanges and the Piney Branch complex - a metamorphosed fragment of the central Appalachian ophiolite in northern Virginia.
Avery A. Drake Jr., B. A. Morgan
1983, American Journal of Science (283) 376-381
Several points in the original paper are clarified. (Preceding abstract)-M.S....
Investigation of internal friction in fused quartz, steel, Plexiglass, and Westerly granite from 0.01 to 1.00 Hertz at 10-8 to 10-7 strain amplitude
Hsi-Ping Liu, L. Peselnick
1983, Journal of Geophysical Research Solid Earth (88) 2367-2379
A detailed evaluation on the method of internal friction measurement by the stress-strain hysteresis loop method from 0.01 to 1 Hz at 10−8 to 10−7 strain amplitude and 23.9°C is presented. Significant systematic errors in relative phase measurement can result from convex end surfaces of the sample and stress sensor and from...
HIGH-TEMPERATURE GEOTHERMAL RESOURCES IN HYDROTHERMAL CONVECTION SYSTEMS IN THE UNITED STATES.
Manuel Nathenson
1983, Conference Paper, Electric Power Research Institute, Advanced Power Systems Division, (Report) EPRI AP
The calculation of high-temperature geothermal resources ( greater than 150 degree C) in the United States has been done by estimating the temperature, area, and thickness of each identified system. These data, along with a general model for recoverability of geothermal energy and a calculation that takes account of the...
Isotopic and chemical composition of Parbati Valley geothermal discharges, north-west Himalaya, India
W.F. Giggenbach, R. Gonfiantini, B.L. Jangi, A.H. Truesdell
1983, Geothermics (12) 199-222
The isotopic compositions of the waters discharged from Parbati Valley geothermal areas indicate a higher altitude meteoric origin, with discharge temperatures reflecting variations in the depth of penetration of the waters to levels heated by the existence of a ‘normal’ geothermal gradient. On the basis of mixing models involving silica,...
An examination of the southern California field test for the systematic accumulation of the optical refraction error in geodetic leveling
R. O. Castle, B.W. Brown Jr., T.D. Gilmore, R. K. Mark, R. C. Wilson
1983, Geophysical Research Letters (10) 1081-1084
Appraisals of the two levelings that formed the southern California field test for the accumulation of the atmospheric refraction error indicate that random error and systematic error unrelated to refraction competed with the systematic refraction error and severely complicate any analysis of the test results. If...
River discharge controls phytoplankton dynamics in the northern San Francisco Bay estuary
J. E. Cloern, A.E. Alpine, B.E. Cole, R.L.J. Wong, J.F. Arthur, M.D. Ball
1983, Estuarine, Coastal and Shelf Science (16) 415-429
Phytoplankton dynamics in the upper reach of the northern San Francisco Bay estuary are usually characterized by low biomass dominated by microflagellates or freshwater diatoms in winter, and high biomass dominated by neritic diatoms in summer. During two successive years of very low river discharge (the drought of 1976-77), the...
Progressive changes in the morphology of fluvial terraces and scarps along the Rappahannock River, Virginia.
Steven M. Colman
1983, Earth Surface Processes and Landforms (8) 201-212
Progressive geomorphic changes in the flight of fluvial terraces along the Rappahannock River, Virginia, provide a framework for analysing the effect of time on landforms. Indices of terrace preservation, especially drainage densities and area to perimeter ratios, show systematic changes with terrace age. Higher scarps tend to have steeper slopes...
Tuffaceous sediments as source rocks for uranium: A case study of the White River Formation, Wyoming
R. A. Zielinski
1983, Journal of Geochemical Exploration (18) 285-306
Fine-grained tuffaceous sediments of the White River Formation (Oligocene) are evaluated as a possible source of uranium for the sedimentary uranium deposits of Wyoming. The evaluation is based upon a model in which volcanic glass is considered to be a major host of uranium and thorium and in which uranium...
Simulation of solute transport in a mountain pool-and-riffle stream: A transient storage model
Kenneth E. Bencala, Roy A. Walters
1983, Water Resources Research (19) 718-724
The physical characteristics of mountain streams differ from the uniform and conceptually well- defined open channels for which the analysis of solute transport has been oriented in the past and is now well understood. These physical conditions significantly influence solute transport behavior, as demonstrated by a transient storage model simulation...
Selective concentration of cesium in analcime during hydrothermal alteration, Yellowstone National Park, Wyoming
T. E. C. Keith, J. M. Thompson, R. E. Mays
1983, Geochimica et Cosmochimica Acta (47) 795-804
Chemical and mineralogical studies of fresh and hydrothermally altered rhyolitic material in Upper and Lower Geyser Basins, Yellowstone National Park, show that all the altered rocks are enriched in Cs and that Cs is selectively concentrated in analcime. The Cs content of unaltered rhyolite lava flows, including those from which...
High paleointensities of the geomagnetic field from thermomagnetic studies on rift valley pillow basalts from the Mid- Atlantic Ridge
M. Prevot, E. A. Mankinen, S. Gromme, A. Lecaille
1983, Journal of Geophysical Research Solid Earth (88) 2316-2326
Nineteen pillow basalts dredged within the rift valley of the Mid-Atlantic Ridge at36.8°N were studied by the Thellier stepwise heating method in order to determine the paleointensity of the geomagnetic field when they erupted on to the sea floor. Previously reported fission track ages are...
On the reported optical activity of amino acids in the Murchison meteorite
J.L. Bada, J.R. Cronin, M.-S. Ho, K.A. Kvenvolden, J.G. Lawless, S.L. Miller, John Oro, S. Steinberg
1983, Nature (301) 494-496
In analyses of extracts from the Murchison meteorite (a carbonaceous chondrite), Engel and Nagy1 reported an excess of L-enantiomers for several protein amino acids but found that the non-protein amino acids were racemic. They suggested that the excess of L-isomers might have resulted from an asymmetric synthesis or decomposition. Their...
Regional significance of pre-Wisconsinan till from Nantucket Island, Massachusetts
R. N. Oldale, D.M. Eskenasy
1983, Quaternary Research (19) 302-311
A major pre-Wisconsinan glacial event is the only possible source of the lower till on Nantucket Island, Massachusetts. The till occurs near the late Wisconsinan drift border and below fossiliferous marine beds of oxygen-isotope stage 5 (Sangamonian) age. It is considered to be Illinoian in age, but the evidence is...
Approximate sampling distribution of the serial correlation coefficient for small samples
Gary D. Tasker
1983, Water Resources Research (19) 579-582
The probability density function for the sample serial correlation coefficient r can be approximated byf(r) = (β(½, ½(T + 1)))−1(1 − r2)½(T− 1)(1+ c2 − 2cr)−½(T), whereβ is the Beta function, T= n− 2, c = ρ − [(1 + ρ)/(n − 3)], n is the number of observations, and ρ is the population lag one serial correlation. This distribution is derived from...
Generalized adjustment by least squares ( GALS).
A.A. Elassal
1983, Photogrammetric Engineering and Remote Sensing (49) 201-206
The least-squares principle is universally accepted as the basis for adjustment procedures in the allied fields of geodesy, photogrammetry and surveying. A prototype software package for Generalized Adjustment by Least Squares (GALS) is described. The package is designed to perform all least-squares-related functions in a typical adjustment program. GALS is...
Evidence for a postglacial low relative sea-level stand in the drowned delta of the Merrimack River, Western Gulf of Maine
R. N. Oldale, L. E. Wommack, A.B. Whitney
1983, Quaternary Research (19) 325-336
A submerged delta of the Merrimack River, located offshore between Cape Ann, Massachusetts, and the New Hampshire border, indicates a postglacial low relative see-level stand of about -47 m. The low stand is inferred to date to 10,500 yr B.P., but a lack of age control makes this assignment uncertain....
Lead-isotopic compositions of diverse igneous rocks and ore deposits from southwestern New Mexico and their implications for early Proterozoic crustal evolution in the western United States
J. S. Stacey, D. C. Hedlund
1983, Geological Society of America Bulletin (94) 43-57
U-Pb zircon measurements from some of the basement rocks in southwestern New Mexico have ages that range from 1,650 to 1,450 m.y.The largest ore deposits occur near Silver City in the southwest part of the region studied. They are associated with Laramide alkali...
Location of internal hydrogen atoms in the paradodecatungstate polyanion by neutron diffraction
H. T. Evans Jr., E. Prince
1983, Journal of the American Chemical Society (105) 4838-4839
No abstract available....
Clay mineral formation and transformation in rocks and soils
D. D. Eberl
1983, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (311) 241-257
Three mechanisms for clay mineral formation (inheritance, neoformation, and transformation) operating in three geological environments (weathering, sedimentary, and diagenetic-hydrothermal) yield nine possibilities for the origin of clay minerals in nature. Several of these possibilities are discussed in terms of the rock cycle. The mineralogy of clays neoformed in the weathering...
Statistical averaging of marine magnetic anomalies and the aging of oceanic crust
R.J. Blakely
1983, Journal of Geophysical Research Solid Earth (88) 2289-2296
Visual comparison of Mesozoic and Cenozoic magnetic anomalies in the North Pacific suggests that older anomalies contain less short-wavelength information than younger anomalies in this area. To test this observation, magnetic profiles from the North Pacific are examined from crust of three ages: 0–2.1, 29.3–33.1, and 64.9–70.3 m.y, B.P. For...
A natural earthquake laboratory in Arkansas
A. C. Johnston
1983, Earthquake Information Bulletin (USGS) (15) 210-215
Holocene history of the estuarine area surrounding Portage, Alaska, as recorded in a 93 m core
S. Bartsch-Winkler, A.T. Ovenshine, R. Kachadoorian
1983, Canadian Journal of Earth Sciences (20) 802-820
A 93 m core obtained at Portage, Alaska records four prograding cycles of estuarine deposition for the past 8230 ± 100 years. Analyses of texture, mineralogy, paleontology, and sedimentary structures enable definition of eight lithologic units. Mineralogic studies show that past and present sedimentation at Portage has been largely mud and sand from...
Nesting biology of laughing gulls in relation to agricultural chemicals in south Texas USA 1978-1981
Donald H. White, C. A. Mitchell, R. M. Prouty
1983, The Wilson Bulletin (95) 540-551
Various aspects of the breeding biology of Laughing Gulls (Larus atricilla) have been studied extensively in Florida (Dinsmore and Schreiber 1974, Schreiber et al. 1979, Schreiber and Schreiber 1980), New Jersey (Bongiorno 1970, Burger and Beer 1976, Burger 1976, Montevecchi 1978), and Massachusetts (Noble and Wurm 1943), but little is...
Hydrology of the Ferron Sandstone aquifer and effects of proposed surface-coal mining in Castle Valley, Utah, with a section on stratigraphy and a section on leaching of overburden
Gregory C. Lines, Daniel J. Morrissey, Thomas A. Ryer, Richard H. Fuller
1983, Water Supply Paper 2195
Coal in the Ferron Sandstone Member of the Mancos Shale of Cretaceous age has traditionally been mined by underground techniques in the Emery Coal Field in the southern end of Castle Valley in east-central Utah. However, approximately 99 million tons are recoverable by surface mining. Ground water in the Ferron...
Geobarometry of ultramafic xenoliths from Loihi Seamount, Hawaii, on the basis of CO2 inclusions in olivine
E. Roedder
1983, Earth and Planetary Science Letters (66) 369-379
Abundant fluid inclusions in olivine of dunite xenoliths (∼1–3 cm) in basalt dredged from the young Loihi Seamount, 30 km southeast of Hawaii, are evidence for three coexisting immiscible fluid phases—silicate melt (now glass), sulfide melt (now solid), and dense supercritical CO2 (now liquid + gas)—during growth and later fracturing of some of...
