Evolution of an ophiolitic tectonic melange, Marble Mountains, northern California Klamath Mountains (USA)
M. M. Donato
1987, Geological Society of America Bulletin (98) 448-464
The Marble Mountain terrane of northern California constitutes a metamorphosed ophiolitic tectonic mélange occupying the lowest structural levels of the western Paleozoic and Triassic belt of the Klamath Mountains province. On the basis of lithology and structural position, it probably represents the metamorphosed equivalent of the Rattlesnake Creek terrane. The...
Ice-edge eddies in the Fram Strait marginal ice zone
O.M. Johannessen, J.A. Johannessen, E. Svendsen, R.A. Shuchman, W. J. Campbell, E. Josberger
1987, Science (236) 427-429
Five prominent ice-edge eddies in Fram Strait on the scale of 30 to 40 kilometers were observed over deep water within 77°N to 79°N and 5°W to 3°E. The use of remote sensing, a satellite-tracked buoy, and in situ oceanographic measurements showed the presence of eddies with orbital speeds of...
Thermodynamics of aragonite-strontianite solid solutions: Results from stoichiometric solubility at 25 and 76°C
Niel Plummer, E. Busenberg
1987, Geochimica et Cosmochimica Acta (51) 1393-1411
Dissolution of synthetic strontianite-aragonite solid solutions was followed analytically to stoichiometric saturation using large solid to solution ratios in CO2-H2O solution at 25 and 76°C. The compositional dependence of the equilibrium constant was calculated from the composition of saturated (stoichiometric) solutions and used to calculate the activities and activity...
Possible Late Middle Ordovician organic carbon isotope excursion: Evidence from Ordovician oils and hydrocarbon source rocks, mid-continent and east-central United States
Joseph R. Hatch, Stephen R. Jacobson, Brian J. Witzke, J. Bruno Risatti, Donald E. Anders, W. Lynn Watney, K. David Newell, April K. Vuletich
1987, American Association of Petroleum Geologists Bulletin (71) 1342-1354
Oils generated by Middle Ordovician rocks are found throughout the Mid-Continent and east-central regions of the United States. Gas chromatographic characteristics of these oils include a relatively high abundance of n-alkanes with carbon numbers less than 20, a strong predominance of odd-numbered n-alkanes between C10 and C20, and relatively small amounts...
Precambrian geology of the U.S.A.
J. C. Reed Jr.
1987, Episodes (10) 243-247
Although exposures of Precambrian rocks in the USA are widely scattered, recent studies have provided much information about their subsurface distribution and tectonic history. This article reviews the geological development of the Archean craton, orogenic belts and cratonic cover of Proterozoic age, the Midcontinent rift system, and Precambrian rocks caught...
Evolution and petroleum geology of Amlia and Amukta intra-arc summit basins, Aleutian Ridge
E.L. Geist, J.R. Childs, D.W. Scholl
1987, Marine and Petroleum Geology (4) 334-352
Amlia and Amukta Basins are the largest of many intra-arc basins formed in late Cenozoic time along the crest of the Aleutian Arc. Both basins are grabens filled with 2-5 km of arc-derived sediment. A complex system of normal faults deformed the basinal strata. Although initial deposits of late Micocene...
Quarterly Wildlife Mortality Report July 1986- September 1986
J. C. Franson, R. Windingstad, K. A. Converse, T. Roffe
1987, Wildlife Disease Newsletter (23) 1-2
No abstract available....
Vapor pressures and gas-film coefficients for ketones
R. E. Rathbun, D. Y. Tai
1987, Chemosphere (16) 69-78
Comparison of handbook vapor pressures for seven ketones with more recent literature data showed large differences for four of the ketones. Gas-film coefficients for the volatilization of these ketones from water determined by two different methods were in reasonable agreement....
Seismic response of dam with soil‐structure interaction
G.N. Bycroft, P. N. Mork
1987, Journal of Engineering Mechanics (113) 1420-1428
An analytical solution to the response of a long trapezoidal‐section dam on a foundation consisting of an elastic half‐space and subjected to simulated earthquake morion is developed. An optimum seismic design is achieved when the cross section of the dam is triangular. The effect of soil structure interaction is to...
ANALYSIS OF ESTUARINE TRACER-GAS TRANSPORT AND DESORPTION.
Jerad D. Bales, Edward R. Holley
1987, Conference Paper
The riverine tracer-gas technique provides a direct, reach-averaged measure of gas exchange, is fairly simple to implement, and is widely accepted for determining reaeration-rate coefficients in rivers. The method, however, is not directly applicable to flows having vertical density gradients. Consequently, studies were undertaken to develop and evaluate methods for...
Near infrared detection of ammonium minerals
M. D. Krohn, S. P. Altaner
1987, Geophysics (52) 924-930
Diagnostic near-infrared spectral features have been identified for minerals with ammonium (NH (super +) 4 ) bound in the crystal structure. Spectral bands near 2.12, 2.02, and 1.56 mu m are characteristic of synthetic and natural NH 4 -bearing minerals. Laboratory spectra of NH 4 -bearing minerals are distinct from spectra of OH-bearing minerals and have...
Mineralogy and petrology of the Cretaceous- Tertiary boundary clay bed and adjacent clay-rich rocks, Raton Basin, New Mexico and Colorado.
R. M. Pollastro, C. L. Pillmore
1987, Journal of Sedimentary Petrology (57) 456-466
The Cretaceous-Tertiary (K-T) boundary is preserved in a sequence of coal-bearing, fluvial rocks in the lower part of the Raton Formation (Late Cretaceous and Paleocene) at several sites in the east-central part of the Raton Basin. The K-T boundary occurs at the top...
Application of microwave digestion to the analysis of peat
C. S.E. Papp, L. B. Fischer
1987, The Analyst (112) 337-338
A microwave digestion technique for the dissolution of peat is described and compared with a dry ashing method and a nitric - perchloric - hydrofluoric acid wet digestion. Peat samples with different organic matter contents were used and Ca, Mg, Fe, AI, Na, K, Mn, Zn, Cu and Li were...
Petrogenesis of gabbronorite at Yakobi and northwest Chichagof Islands, Alaska
G. R. Himmelberg, R. A. Loney, P.I. Nabelek
1987, Geological Society of America Bulletin (98) 265-279
On Yakobi Island and at Mirror Harbor on the northwest coast of Chichagof Island, gabbronorite occurs as irregular bodies, as much as 5.5 km in maximum dimension, mostly within a 40 to 43 m.y. composite pluton consisting largely of tonalite. The gab-bronorites are the host rocks for a magmatic nickel-copper...
Evaluation of the 1985-1990 IGRF secular variation candidates
J.C. Cain, C. Kluth
1987, Physics of the Earth and Planetary Interiors (48) 362-378
The IGRF secular variation model for 1985-1990 was adopted by the International Association of Geomagnetism and Aeronomy at its Prague meeting in August 1985 as an average of the three candidate models submitted to the committee. We compared the three models at epoch 1985.0 against each other and against a...
Heavy-mineral suites confirm the wide extent of the Peach Springs Tuff in California and Arizona, U.S.A.
S. Gusa, J. E. Nielson, K. A. Howard
1987, Journal of Volcanology and Geothermal Research (33) 343-347
[No abstract available]...
EFFECT OF AN ACID RAIN ENVIRONMENT ON LIMESTONE SURFACES.
Victor G. Mossotti, James R. Lindsay, Michael F. Hochella Jr.
1987, Materials Performance (26) 47-52
Salem limestone samples were exposed to weathering for 1 y in several urban and one rural environments. Samples exposed in the rural location were chemically indistinguishable from the freshly quarried limestone, whereas all samples collected from urban exposure sites developed gypsum stains on the ground-facing surfaces where the stones were...
The global carbon cycle and Quaternary paleoclimates.
E.T. Sundquist
1987, Episodes (10) 7-10
Key evidence of ancient CO2 concentrations has come from studies of ice cores, marine sediments, ocean current patterns, and oceanic biochemistry and biota, but there are conflicting views about the role of the marine biological pump, especially as regards the deglacial increase in CO2.-from Author...
HYDROBIOLOGICAL CHARACTERISTICS OF THE COASTAL LAGOONS AT HUGH TAYLOR BIRCH STATE RECREATION AREA, FORT LAUDERDALE, FLORIDA: A HISTORICAL PERSPECTIVE.
Robert J. Brock
1987, Conference Paper, Oceans Conference Record (IEEE)
The author presents initial results of an ongoing study of Southeast Florida coastal lagoon lakes. Objectives include presenting environmental conditions within and adjacent to the lagoons under a variety of hydrologic conditions and to determine water-quality changes in ground water and surface water and how these changes in water quality...
The decarbonation and heat capacity of ZnCO3
H.T. Haselton, J. R. Goldsmith
1987, Geochimica et Cosmochimica Acta (51) 261-265
The decarbonation curve for ZnCO3 has been determined in the pressure range 3–20 kbar by using a combination of cold-seal vessels and piston-cylinder apparatus with NaCl assemblies. Heat capacities for both synthetic and natural ZnCO3 samples were measured by differential scanning calorimetry at temperatures ranging from 340 to 497 K. The results...
On the interpretation of the geomagnetic energy spectrum
E.R. Benton, L.R. Alldredge
1987, Physics of the Earth and Planetary Interiors (48) 265-278
Two recent high-degree magnetic energy spectra, based mostly on MAGSAT data, are compared and found to agree very well out to order and degree n = 15, but the spectrum remains somewhat uncertain for higher degrees. The hypothesis that a primary break in the slope of the spectrum, plotted semi-logarithmically,...
Fabric and its relation to sedimentologic and physical properties of near-surface sediment, Shelikof Strait and Alsek prodelta, Alaska
M.E. Torresan, W. C. Schwab
1987, Journal of Sedimentary Petrology (57) 408-418
To investigate the possible relation between the fabric (microstructural arrangement of particles) of a fine-grained sedimentary deposit and the depositional and environmental processes of that deposit, the fabric of sediment samples from the sea floor of two different depositional settings, Shelikof Strait and...
Pressure sensitivity of low permeability sandstones
N.H. Kilmer, N.R. Morrow, Janet K. Pitman
1987, Journal of Petroleum Science and Engineering (1) 65-81
Detailed core analysis has been carried out on 32 tight sandstones with permeabilities ranging over four orders of magnitude (0.0002 to 4.8 mD at 5000 psi confining pressure). Relationships between gas permeability and net confining pressure were measured for cycles of loading and unloading. For some samples, permeabilities were measured...
A comparison of water solubility enhancements of organic solutes by aquatic humic materials and commercial humic acids
C.T. Chlou, Daniel E. Kile, T.I. Brinton, Ronald L. Malcolm, J.A. Leenheer, P. MacCarthy
1987, Environmental Science & Technology (21) 1231-1234
No abstract available....
Quarterly Wildlife Mortality Report October 1986- December 1986
K. A. Converse, R. Windingstad, J. C. Franson, T. Roffe
1987, Wildlife Disease Newsletter (23)
No abstract available....
