Historical review of and current progress in coal-resource estimation in the United States
G.H. Wood Jr.
1981, Geological Society of America Bulletin (92) 520-528
Nine estimates of the coal resources of the United States have been published in the past 71 years. Although many details of these estimates differ markedly, the 1913, 1922, and 1974 estimates are surprisingly similar. Some differences are due to increased geologic data,...
Hydrologic testing of tight zones in southeastern New Mexico
K.F. Dennehy, P. A. Davis
1981, Groundwater (19) 482-489
Increased attention is being directed toward the investigation of tight zones in relation to the storage and disposal of hazardous wastes. Shut-in tests, slug tests, and pressure-slug tests are being used at the proposed Waste Isolation Pilot Plant site, located in southeastern New Mexico, to...
Plate-tectonic mechanism of Laramide deformation.
W. Hamilton
1981, Contributions to Geology - University of Wyoming, Laramie (19) 87-92
The Laramide compressive deformation of the craton was caused by a clockwise rotation of about 2-4o of the Colorado Plateau region relative to the continental interior, during late Late Cretaceous and early Tertiary time. Late Paleozoic and Neogene deformation of the craton also were produced by motion of a southwestern...
Late Cenozoic stages and molluscan zones of the U.S. Middle Atlantic Coastal Plain
B. W. Blackwelder
1981, Journal of Paleontology, Supplement, Part II (55)
Pliocene to Holocene deposits of the U.S.Atlantic Coastal Plain from Maryland to Georgia are divided into four stages and four substages using molluscan biostratigraphic data. These divisions are the Wiltonian and Burwellian Stages (early Pliocene), Gouldian and Windyan Substages of the Colerainian Stage (late Pliocene to early Pleistocene), and Myrtlean...
Origin and structural implications of upper Miocene rhyolites in Kingston Canyon, Piute County, Utah
P. D. Rowley, T. A. Steven, H. H. Mehnert
1981, Geological Society of America Bulletin (92) 590-602
Kingston Canyon is one of the deepest antecedent canyons in the High Plateaus subprovince of the Colorado Plateaus. Here the East Fork of the Sevier River flows westward transversely across the gently east tilted Sevier Plateau, which is developed on a basin-range fault...
Halogenated benzene radical cations and ground state degeneracy splitting by asymmetric substitution
V.E. Bondybey, C.R. Vaughn, T.A. Miller, J.H. English, R.H. Shiley
1981, Journal of Chemical Physics (74) 6584-6591
The absorption and laser induced fluorescence of several halogenated benzene radical cations were studied in solid Ne matrices. The spectra of 1,2,4-trifluorobenzene, l,3-dichloro-5-fluorobenzene, and l-chloro-3,5- difluorobenzene radical cations are observed and analyzed. Studies of fluorescence polarization and a photoselection technique were used to examine the splitting of the degeneracy of...
Chemical modifications accompanying blueschist facies metamorphism of Franciscan conglomerates, Diablo Range, California
Diane E. Moore, J. G. Liou, B.-S. King
1981, Chemical Geology (33) 237-263
As part of an investigation of blueschist-facies mineral parageneses in pebbles and matrix of some Franciscan metaconglomerates of the Diablo Range, California, textural and major-element chemical analyses were conducted on a number of igneous pebbles that comprise a range of rock types from granite and dacite to gabbro and basalt....
Sequential extraction techniques applied to a porphyry copper deposit in the basin and range province
L.H. Filipek, P. K. Theobald Jr.
1981, Journal of Geochemical Exploration (14) 155-174
Samples of minus-80-mesh (<180 μm) stream sediment, rock containing exposed fracture coatings, and jarosite and chrysocolla were collected from an area surrounding the North Silver Bell porphyry Cu deposit near Tucson, Arizona. The samples were subjected to a series of extractions in a scheme originally designed for use on...
Geochemical prospecting for hydrocarbons in the outer continental shelf, Southern Bering Sea, Alaska
K.A. Kvenvolden, T.M. Vogel, J.V. Gardner
1981, Journal of Geochemical Exploration (14) 209-219
This geochemical survey is based on 20 stations located on the outer continental shelf of the southern Bering Sea in an area of 30,000 km2 that includes St. George basin. Hydrocarbon gases from sediment samples recovered by gravity coring at each of the stations were analyzed by gas chromatography. Data are...
The Redskin granite: Evidence for thermogravitational diffusion in a Precambrian granite batholith
S. Ludington
1981, Journal of Geophysical Research Solid Earth (86) 10423-10430
The 1000-Ma-old composite Pikes Peak batholith consists largely of medium- to coarse-grained biotite granite but is intruded by several smaller granite plutons. Two of these, the Tarryall Mountains batholith and the Redskin Granite (Hawley, 1969; Hawley and Wobus, 1977), are here interpreted as cupolas atop the main mass of the...
Faulting in outer continental shelf of southern Bering Sea
James V. Gardner, Tracy L. Vallier
1981, American Association of Petroleum Geologists Bulletin (65) 1568-1573
Synthesis of more than 10 000 line-km of high-resolution seismic data indicates the distribution, types, and trends of faults present on the outer continental shelf of the southern Bering Sea. Faults are classified into three types as to whether they 1) offset the sea floor (surface fault), 2) show less...
Late Cenzoic rhyolites from the Kern Plateau, southern Sierra Nevada, California.
C. R. Bacon, W. A. Duffield
1981, American Journal of Science (281) 1-34
Four late Cenozoic rhyolite domes lie atop the Kern Plateau, 30 to 40km S-SE of Mount Whitney. K-Ar and 40Ar/39Ar dating shows that Monache, Templeton, and Little Templeton Mountains are all about 2.4Ma old; a small dome nearby is approx 0.2Ma old. The three older rhyolites have SiO2 = 73-74%...
East Pacific rise at 21°N: the volcanic, tectonic, and hydrothermal processes of the central axis
Richard D. Ballard, Jean Francheteau, Tierre Juteau, Claude Rangan, William Normark
1981, Earth and Planetary Science Letters (55) 1-10
Photographs obtained by the ANGUS survey system at 21°N reveal many similarities to the geological processes delineated at other spreading centers and in particular those observed in the Galapagos Rift at 86°W. The region of recent volcanism is restricted to a narrow zone (Zone 1) approximately 1 km wide. This...
Response of the suspended sediment transport system to continental shelf dynamics
Herman A. Karl, D.E. Drake, D.A. Cacchione
1981, Geo-Marine Letters (1) 243-248
Surface currents influenced by a wind-driven upwelling event in San Pedro Bay moved total suspended matter (TSM) confined to the inner shelf on 19 April 1978 seaward, so that by 27 April surface TSM had increased over the outer shelf. Near-bottom concentrations of TSM also increased across the shelf during...
The origin and isotopic composition of dissolved sulfide in groundwater from carbonate aquifers in Florida and Texas
R. O. Rye, W. Back, B.B. Hanshaw, C.T. Rightmire, F. J. Pearson Jr.
1981, Geochimica et Cosmochimica Acta (45) 1941-1950
The δ34S values of dissolved sulfide and the sulfur isotope fractionations between dissolved sulfide and sulfate species in Floridan ground water generally correlate with dissolved sulfate concentrations which are related to flow patterns and residence time within the aquifer. The dissolved sulfide derives from the slow in situ biogenic reduction of sulfate dissolved from...
The relationship of geophysical measurements to hydraulic conductivity at the Brantley damsite, New Mexico
U. Schimschal
1981, Geoexploration (19) 115-125
The objective of this study was to develop techniques to correlate hydraulic conductivity tests with geophysical logs. In addition, the relationships obtained from boreholes were correlated to surface resistivity soundings in an effort to define areas of potential high water loss at the proposed site for Brantley Dam.Hydraulic conductivity obtained...
A distribution-free alternative to least-squares regression and its application to Rb/Sr isochron calculations
R.G. Vugrinovich
1981, Journal of the International Association for Mathematical Geology (13) 443-454
A distribution-free estimator of the slope of a regression line is introduced. This estimator is designated Sm and is given by the median of the set of n(n - 1)/2 slope estimators, which may be calculated by inserting pairs of points (Xi, Yi)and (Xj, Yj)into the slope formula Si =...
Geological opportunities and constraints on the use of underground space
M.S. Walton
1981, Underground Space (5) 287-289
[No abstract available]...
Minor and trace element geochemistry of volcanic rocks dredged from the Galapagos spreading center: Role of crystal fractionation and mantle heterogeneity
D.A. Clague, F.A. Frey, G. Thompson, S. Rindge
1981, Journal of Geophysical Research Solid Earth (86) 9469-9482
A wide range of rock types (abyssal tholeiite, Fe-Ti-rich basalt, andesite, and rhyodacite) were dredged from near 95°W and 85°W on the Galapagos spreading center. Computer modeling of major element compositions has shown that these rocks could be derived from common parental magmas by successive degrees of fractional crystallization. However,...
Chrysophyte cysts as potential environmental indicators
D.P. Adam, A.D. Mahood
1981, Geological Society of America Bulletin (92) 839-844
Many Chrysophyte algae produce morphologically distinctive, siliceous, microscopic cysts during a resting stage of their life cycles; these cysts are often preserved in sediments. Scanning electron microscopy and Nomarski optics permit much more detailed observation of these cysts than was heretofore possible. We...
Geodetic strain measurements in Washington
J.C. Savage, M. Lisowski, W.H. Prescott
1981, Journal of Geophysical Research Solid Earth (86) 4929-4940
Two new geodetic measurements of strain accumulation in the state of Washington for the interval 1972–1979 are reported. Near Seattle the average principal strain rates are 0.07 ± 0.03 μstrain/yr N 19°W and −0.13 ± 0.02 μstrain/yr N71°E, and near Richland (south central Washington) the average principal strain rates are...
On the use of the nephelometer in estuarine waters
A. Eaton, V. Grant, O. Bricker, D. Wells
1981, Estuaries (4) 379-384
A study of the problems encountered in nephelometric determinations of suspended sediment loads in the Chesapeake Bay estuary has led to development of a technique which uses nephelometer readings as a guide for sampling at vertical profiles in an estuary. This permits optimum sampling for concentration profiles and allows one...
Migration through soil of organic solutes in an oil-shale process water
J.A. Leenheer, H. A. Stuber
1981, Environmental Science & Technology (15) 1467-1475
The migration through soil of organic solutes in an oil-shale process water (retort water) was studied by using soil columns and analyzing leachates for various organic constituents. Retort water extracted significant quantities of organic anions leached from ammonium-saturated-soil organic matter, and a distilled-water rinse, which followed retort-water leaching, released additional...
New maps of Federal coal
R. G. Wayland
1981, Geological Society of America Bulletin (92) 542-550
Compilation and analysis of publicly available data on Federal coal are resulting in voluminous map sets showing coal isopachs, structure contours, and overburden isopachs on each known minable coal bed. As of the spring of 1981, there are available from the U.S. Geological...
Aseismic uplift in California
Robert O. Castle, Michael R. Elliot, Thomas D. Gilmore, Robert K. Mark, Evelyn B. Newman, John C. Tinsley III, D.D. Jackson, W.B. Lee, C.-C. Liu
1981, Science (213) 246-247
We disagree with several of the arguments cited by Jackson et al. in support of their view that "the inference of wide-spread aseismic uplift in southern California is not justified" (1). Specifically, the striking correlation shown in figure 1 of Jackson et al. (1) is an artifact of the construction,...
