A statistical overview of mass movement characteristics on the North American Atlantic outer continental margin
James S. Booth, Dennis W. O'Leary
1992, Marine Geotechnology (10) 1-18
An analysis of 179 mass movements on the North American Atlantic continental slope and upper rise shows that slope failures have occurred throughout the geographic extent of the outer margin. Although the slope failures show no striking affinity for a particular depth as an origination level, there is a broad,...
Increasing rates of atmospheric mercury deposition in midcontinental North America
Edward B. Swain, Daniel R. Engstrom, Mark E. Brigham, Thomas A. Henning, P.L. Brezonik
1992, Science (257) 784-787
Mercury contamination of remote lakes has been attributed to increasing deposition of atmospheric mercury, yet historic deposition rates and inputs from terrestrial sources are essentially unknown. Sediments of seven headwater lakes in Minnesota and Wisconsin were used to reconstruct regional modern and preindustrial deposition rates of mercury. Whole-basin mercury fluxes,...
Groundwater dolocretes from the Upper Triassic of the Paris Basin, France: A case study of an arid, continental diagenetic facies
C. Spotl, V.P. Wright
1992, Sedimentology (39) 1119-1136
Thick dolomite-cemented horizons (dolocretes) occur within a fluvial sandstone-mudstone sequence of Late Triassic age in the western part of the Paris Basin, France. Two types of dolomites can be distinguished: (a) nodular dolomitic beds less than a few metres thick, which formed within mottled overbank siltstones and mudstones; and (b)...
Controls on the accumulation of coal and on the development of anastomosed fluvial systems in the Cretaceous Dakota Formation of southern Utah
M.A. Kirschbaum, P.J. McCabe
1992, Sedimentology (39) 581-598
Alluvial strata of the Cretaceous Dakota Formation of southern Utah are part of a transgressive systems tract associated with a foreland basin developed adjacent to the Sevier orogenic belt. These strata contain valley fill deposits, anastomosed channel systems and widespread coals. The coals constitute a relatively minor part of the...
Palaeoecology and sedimentology of the dysaerobic Bedford fauna (late Devonian), Ohio and Kentucky (USA)
J.C. Pashin, F.R. Ettensohn
1992, Palaeogeography, Palaeoclimatology, Palaeoecology (91) 21-34
Oxygen-deficient biofacies models rely on lithologic and paleontologic attributes to identify distinctive biofacies interpreted to reflect levels of oxygenation in anaerobic, dysaerobic, and aerobic parts of a stratified water column. This study of the Bedford fauna from the Bedford Shale of Ohio and Kentucky and from adjacent black-shale units reports...
Geochemical and detrital mode evidence for two sources of Early Proterozoic sedimentary rocks from the Tonto Basin Supergroup, central Arizona
K.C. Condie, P.D. Noll Jr., C. M. Conway
1992, Sedimentary Geology (77) 51-76
The Tonto Basin Supergroup includes up to 6.5 km of Early Proterozoic sedimentary and volcanic rocks that were deposited in a relatively short period of time at about 1.7 Ga in central Arizona. Moderate correlations of rare earth elements (REE) and Ti with Al2O3 and REE distributions in detrital sediments of...
Pre-Elsonian mafic magmatism in the Nain Igneous Complex, Labrador: The bridges layered intrusion
L.D. Ashwal, R.A. Wiebe, J. L. Wooden, M.J. Whitehouse, Diane Snyder
1992, Precambrian Research (56) 73-87
Decades of work on the pristine, unmetamorphosed, and well exposed anorthositic, mafic and granitic rocks of the Nain igneous complex, Labrador, have led to the conclusion that all plutonic rocks in that area were emplaced in a short time intercal at about 1300 ± 10 Ma). We report here new...
Geochronology and subsurface stratigraphy of Pukapuka and Rakahanga atolls, Cook Islands: Late Quaternary reef growth and sea level history
S.C. Gray, J.R. Hein, R. Hausmann, U. Radtke
1992, Palaeogeography, Palaeoclimatology, Palaeoecology (91) 377-394
Eustatic sea-level cycles superposed on thermal subsidence of an atoll produce layers of high sea-level reefs separated by erosional unconformities. Coral samples from these reefs from cores drilled to 50 m beneath the lagoons of Pukapuka and Rakahanga atolls, northern Cook Islands give electron spin resonance (ESR) and U-series ages...
The "terminal Triassic catastrophic extinction event" in perspective: A review of carboniferous through Early Jurassic terrestrial vertebrate extinction patterns
R.E. Weems
1992, Palaeogeography, Palaeoclimatology, Palaeoecology (94) 1-29
A catastrophic terminal Triassic extinction event among terrestrial vertebrates is not supported by available evidence. The current model for such an extinction is based on at least eight weak or untenable assumptions: (1) a terminal Triassic extinction-inducing asteroid impact occurred, (2) a terminal Triassic synchronous mass extinction of terrestrial vertebrates...
The international seismological observing period in Africa
E.R. Engdahl, Eric A. Bergman
1992, Tectonophysics (209) 1-16
The International Seismological Observing Period (ISOP) is a specific time interval designated for enhanced international cooperation in the collection and dissemination of observatory measurements from the global seismographic network. The primary purpose of the ISOP is to strengthen the international infrastructure that supports current seismological practice and increase the cooperation...
Charnockites and granites of the western Adirondacks, New York, USA: A differentiated A-type suite
P.R. Whitney
1992, Precambrian Research (57) 1-19
Granitic rocks in the west-central Adirondack Highlands of New York State include both relatively homogeneous charnockitic and hornblende granitic gneisses (CG), that occur in thick stratiform bodies and elliptical domes, and heterogeneous leucogneisses (LG), that commonly are interlayered with metasedimentary rocks. Major- and trace-element geochemical analyses were obtained for 115...
Distribution and characteristics of a Middle Ordovician oolitic ironstone in northeastern Kansas based on petrographic and petrophysical properties: A Laurasian ironstone case study
P. Berendsen, J.H. Doveton, S. Speczik
1992, Sedimentary Geology (76) 207-219
The margins of Gondwana are generally considered to be the major sites of oolitic ironstone production during the Ordovician, and appear to be linked with global eustatic sea-level rise. Occurrences of oolitic ironstones within the North American craton are less well documented, but provide important supplementary data. The low latitude...
Earthquake nucleation on faults with rate-and state-dependent strength
James H. Dieterich
1992, Tectonophysics (211) 115-134
Faults with rate- and state-dependent constitutive properties reproduce a range of observed fault slip phenomena including spontaneous nucleation of slip instabilities at stresses above some critical stress level and recovery of strength following slip instability. Calculations with a plane-strain fault model with spatially varying properties demonstrate that accelerating slip precedes...
The change in orientation of subsidiary shears near faults containing pore fluid under high pressure
J. Byerlee
1992, Tectonophysics (211) 295-303
The mechanical effects of a fault containing near-lithostatic fluid pressure in which fluid pressure decreases monotonically from the core of the fault zone to the adjacent country rock is considered. This fluid pressure distribution has mechanical implications for the orientation of subsidiary shears around a fault. Analysis shows that the...
Spectral ratio method for measuring emissivity
K. Watson
1992, Remote Sensing of Environment (42) 113-116
The spectral ratio method is based on the concept that although the spectral radiances are very sensitive to small changes in temperature the ratios are not. Only an approximate estimate of temperature is required thus, for example, we can determine the emissivity ratio to an accuracy of 1% with a...
Hayward fault: Large earthquakes versus surface creep
James J. Lienkaemper, Glenn Borchardt
Glenn Borchardt, Sue E. Hirschfeld, James J. Lienkaemper, Patrick H. McClellan, Patrick L. Williams, Ivan G. Wong, editor(s)
1992, Conference Paper, Proceedings of the second conference on earthquake hazards in the eastern San Francisco Bay area: Special publication 113
The Hayward fault, thought a likely source of large earthquakes in the next few decades, has generated two large historic earthquakes (about magnitude 7), one in 1836 and another in 1868. We know little about the 1836 event, but the 1868 event had a surface rupture extending 41 km along...
Geohydrology and simulated ground-water flow, Plymouth-Carver aquifer, southeastern Massachusetts
Bruce P. Hansen, Wayne W. Lapham
1992, Water-Resources Investigations Report 90-4204
The Plymouth-Carver aquifer underlies an area of 140 square miles and is the second largest aquifer in areal extent in Massachusetts. It is composed primarily of saturated glacial sand and gravel. The water-table and bedrock surface were mapped and used to determine saturated thickness of the aquifer, which ranged from...
Earthquake effects a computer animation and paper model
Tau Rho Alpha, Robert A. Page, Leslie C. Gordon
1992, Open-File Report 92-200-B
GPRMODEL one-dimensional full waveform forward modeling of ground penetrating radar data
Michael H. Powers, S.K. Duke, A. C. Huffman, G.R. Olhoeft
1992, Open-File Report 92-532-B
Inversion of plane-wave electromagnetic data for layered earth models using a graphical user interface (Version 1.0)
Walter L. Anderson
1992, Open-File Report 92-518-B
Industrial mineral deposit models; descriptive models for three lacustrine deposit types
G. J. Orris
1992, Open-File Report 92-593
Developments in mineral deposit modeling
James D. Bliss
1992, Bulletin 2004
No abstract available....
Geohydrologic systems in Kansas — Physical framework of the Great Plains aquifer system
Joseph M. Spinazola, R. J. Wolf, Harold E. McGovern
1992, Hydrologic Atlas 722-B
The purpose of this map report is to provide a description of one of the principal geohydrologic systems in Upper Cambrian through Lower Cretaceous rocks in Kansas. The report is the result of an investigation made as part of the Central Midwest Regional Aquifer-System Analysis (CMRASA). The CMRASA is one...
Descriptive model of salt-dome sulfur and contained-sulfur model for salt-dome sulfur
Keith R. Long
1992, Open-File Report 92-403
Modern mobile methane measurements in marshes
J.S. Leventhal
1992, Open-File Report 92-445
