Constraints from fluid inclusions on sulfide precipitation mechanisms and ore fluid migration in the Viburnum Trend lead district, Missouri
E. L. Rowan, D. L. Leach
1989, Economic Geology (84) 1948-1965
Measurements on fluid inclusions in hydrothermal dolomite cements place constraints on sulfide precipitation mechanisms and on the thermal-hydrologic processes which formed the Viburnum Trend Mississippi Valley-type lead district. Homogenization temperatures and freezing point depressions were determined for fluid inclusions in Bonneterre Dolomite-hosted dolomite cements in mine samples, as well as...
Arsenic in ground-water under oxidizing conditions, south-west United States
F. N. Robertson
1989, Environmental Geochemistry and Health (11) 171-185
Concentrations of dissolved arsenic in ground-water in alluvial basins of Arizona commonly exceed 50 μg L−1 and reach values as large as 1,300 μg L−1. Arsenic speciation analyses show that arsenic occurs in the fully oxidized state of plus 5 (As+5), most likely in the form of...
The hydrologic reponses to development in regional sedimentary aquifers
R.H. Johnston
1989, Groundwater (27) 316-322
The hydrologic response to development of three of the most heavily pumped sedimentary aquifer systems in the United States is similar in some aspects and different in others. In the semiarid West, an unconfined sand aquifer and a confined sand and clay aquifer system have...
Strong correlation of major earthquakes with solid-earth tides in part of the eastern United States
R.E. Weems, W.H. Perry Jr.
1989, Geology (17) 661-664
East of the eastern American continental divide and south of fat 42.5°N, moderate to large historic earthquakes correlate strongly with times of high and low solid-earth tides. This effect is most pronounced when solar declination lies between 17°N and 17°S. Significant correlations also...
Zinc movement in sewage-sludge-treated soils as influenced by soil properties, irrigation water quality, and soil moisture level
J.E. Welch, L.J. Lund
1989, Soil Science (147) 208-214
A soil column study was conducted to assess the movement of Zn in sewage-sludge-amended soils. Varables investigated were soil properties, irrigation water quality, and soil moisture level. Bulk samples of the surface layer of six soil series were packed into columns, 10.2 cm in diameter and 110 cm in length....
Spatial patterns of aftershocks of shallow focus earthquakes in California and implications for deep focus earthquakes
A.J. Michael
1989, Journal of Geophysical Research Solid Earth (94) 5615-5626
Previous workers have pioneered statistical techniques to study the spatial distribution of aftershocks with respect to the focal mechanism of the main shock. Application of these techniques to deep focus earthquakes failed to show clustering of aftershocks near the nodal planes of the main shocks. To better understand the behavior...
Modern sedimentary environments in a large tidal estuary, Delaware Bay
H.J. Knebel
1989, Marine Geology (86) 119-136
Data from an extensive grid of sidescan-sonar records reveal the distribution of sedimentary environments in the large, tidally dominated Delaware Bay estuary. Bathymetric features of the estuary include large tidal channels under the relatively deep (> 10 m water depth) central...
Turbidity-current channels in Queen Inlet, Glacier Bay, Alaska
P.R. Carlson, R.D. Powell, D.M. Rearic
1989, Canadian Journal of Earth Sciences (26) 807-820
Queen Inlet is unique among Glacier Bay fjords because it alone has a branching channel system incised in the Holocene sediment fill of the fjord floor. Bathymetry and seismic-reflection profiles show that four channels begin on, or at the base of, the delta front of this marine-outwash fjord. By midpoint...
A close-range photogrammetric technique for mapping neotectonic features in trenches
G. M. Fairer, J.W. Whitney, J. A. Coe
1989, Bulletin of the Association of Engineering Geologists (26) 521-530
Close-range photogrammetric techniques and newly available computerized plotting equipment were used to map exploratory trench walls that expose Quaternary faults in the vicinity of Yucca Mountain, Nevada. Small-scale structural, lithologic, and stratigraphic features can be rapidly mapped by the photogrammetric method. This method is more accurate and significantly more rapid...
Revised paleomagnetic pole for the Sonoma Volcanics, California
E. A. Mankinen
1989, Geophysical Research Letters (16) 1081-1084
Paleomagnetic sampling of the Miocene and Pliocene Sonoma Volcanics, northern California, was undertaken to supplement an earlier collection. Data from 25 cooling units yield positive fold and reversal tests, and a paleomagnetic pole located at 80.2°N., 069.2°E., with α95 = 6.8°. This paleopole is significantly displaced (9.6°...
Contribution of metapelitic sediments to the composition, heat production, and seismic velocity of the lower crust of southern New Mexico, U.S.A.
M. R. Reid, S.R. Hart, E.R. Padovani, G.A. Wandless
1989, Earth and Planetary Science Letters (95) 367-381
Granulite xenoliths erupted at Kilbourne Hole maar were recently extracted from the lower crust of southern New Mexico. Garnet- and sillimanite-bearing quartzofeldspathic xenoliths had pelitic protoliths and were probably emplaced in the lower crust by tectonic underplating at a lower Proterozoic...
Petrologic evolution of divergent peralkaline magmas from the Silent Canyon caldera complex, southwestern Nevada volcanic field
D.A. Sawyer, K. A. Sargent
1989, Journal of Geophysical Research Solid Earth (94) 6021-6040
The Silent Canyon volcanic center consists of a buried Miocene peralkaline caldera complex and outlying peralkaline lava domes. Its location has been corroborated by geophysical data and more than 50 drill holes. Two widespread ash flow sheets, the Tub Spring and overlying Grouse Canyon members of the Miocene Belted Range...
Thermal stresses due to cooling of a viscoelastic oceanic lithosphere
R.P. Denlinger, W. Z. Savage
1989, Journal of Geophysical Research Solid Earth (94) 744-752
Theories based upon thermal contraction of cooling oceanic lithosphere provide a successful basis for correlating seafloor bathymetry and heat flow. The horizontal components of the contraction of the lithosphere as it cools potentially give rise to large thermal stresses. Current methods to calculate these stresses assume that on the time...
Heat flow and thermotectonic problems of the central Ventura Basin, southern California
R. F. De Rito, A.H. Lachenbruch, T. H. Moses Jr., R. J. Munroe
1989, Journal of Geophysical Research Solid Earth (94) 681-699
The Ventura Basin, southern California, is located near the Big Bend area of the San Andreas fault system, within the Transverse Ranges physiographic province. Continuous equilibrium temperature logs were measured in 12 idle oil wells located within the onshore Ventura Avenue, San Miguelito, Filmore, Oxnard, and West Montalvo fields to...
Solid-state 13C nuclear magnetic resonance studies of coalified gymnosperm xylem tissue from Australian brown coals
Patrick G. Hatcher, Harry E. Lerch, Anne L. Bates, T.V. Verheyen
1989, Organic Geochemistry (14) 145-155
We report here on the use of solid-state 13C nuclear magnetic resonance (NMR) spectroscopy to contrast the average chemical composition of modern degraded gymnosperm woods with fossil gymnosperm woods from Australian brown coals (Miocene). We first established the quantitative nature of the NMR techniques for these samples so that the conventional...
SO2 from episode 48A eruption, Hawaii: Sulfur dioxide emissions from the episode 48A East Rift Zone eruption of Kilauea volcano, Hawaii
R.J. Andres, P.R. Kyle, J. B. Stokes, William I. Rose Jr.
1989, Bulletin of Volcanology (52) 113-117
An SO2 flux of 1170??400 (1??) tonnes per day was measured with a correlation spectrometer (COSPEC) in October and November 1986 from the continuous, nonfountaining, basaltic East Rift Zone eruption (episode 48A) of Kilauea volcano. This flux is 5-27 times less than those of highfountaining episodes, 3-5 times greater than...
West Virginia Geological Survey's role in siting fluidized bed combustion facilities
C.J. Smith, Hobart M. King, K. C. Ashton, D.S. Kirstein, G.H. McColloch
1989, Conference Paper
A project is presented which demonstrates the role of geology in planning and siting a fluidized bed combustion facility. Whenever a project includes natural resource utilization, cooperation between geologists and design engineers will provide an input that could and should save costs, similar to the one stated in our initial...
Non-energy resources, Connecticut and Rhode Island coastal waters
N.F. Neff, R. S. Lewis
1989, Marine Geology (90) 125-130
Cores collected from Long Island Sound, Connecticut, were used to establish control on the geologic framework of the area. Lithologic and stratigraphic analyses verified the presence of the following units: (1) Cretaceous coastal plain, (2) Pleistocene glacial till, (3) late Pleistocene...
Evaluating geographic information systems technology
Stephen C. Guptill
1989, Photogrammetric Engineering and Remote Sensing (55) 1583-1587
Computerized geographic information systems (GISs) are emerging as the spatial data handling tools of choice for solving complex geographical problems. However, few guidelines exist for assisting potential users in identifying suitable hardware and software. A process to be followed in evaluating the merits of GIS technology is presented. Related standards...
Biogeography of marine podocopid Ostracodes in Micronesia
L.S. Weissleader, N.L. Gilinsky, R. M. Ross, T. M. Cronin
1989, Journal of Biogeography (16) 103-114
Shallow-water podocopic marine Ostracoda from Micronesian lagoons in the Marianas, Caroline, Marshall and Gilbert Islands in the western Pacific were analysed to establish their diversity and zoogeography within Micronesia and the taxonomic affinities with ostracodes from other tropical regions. Sixty-four bottom lagoonal sediment samples from twelve islands and atolls yielded...
Data-collection program for Pamlico River Estuary model calibration and validation
Jerad D. Bales
1989, Conference Paper
An investigation is being conducted to collect and interpret continuous records relating to the flow characteristics of the Pamlico River Estuary, North Carolina, and to calibrate and validate a numerical model of estuarine hydrodynamics. The study reach is 50 kilometers long and ranges in width from 330 meters at the...
Adaptive modeling, identification, and control of dynamic structural systems. I. Theory
Erdal Safak
1989, Journal of Engineering Mechanics (115) 2386-2405
A concise review of the fheory of adaptive modeling, identification, and control of dynamic structural systems based on discrete‐time recordings is presented. Adaptive methods have four major advantages over the classical methods: (1) Removal of the noise from the signal is done over the whole frequency band; (2) time‐varying characteristics...
Radiometric calibration of Landsat Thematic Mapper multispectral images
P.S. Chavez Jr.
1989, Photogrammetric Engineering and Remote Sensing (55) 1285-1294
A main problem encountered in radiometric calibration of satellite image data is correcting for atmospheric effects. Without this correction, an image digital number (DN) cannot be converted to a surface reflectance value. In this paper the accuracy of a calibration procedure, which includes a correction for atmospheric scattering, is tested....
The use of total lake-surface area as an indicator of climatic change: Examples from the Lahontan basin
L. V. Benson, Frederick L. Paillet
1989, Quaternary Research (32) 262-275
Variation in the size of lakes in the Lahontan basin is topographically constrained. River diversion also has played a major role in regulating lake size in Lahontan subbasins. The proper gage of lake response to change in the hydrologic balance is neither lake depth (level) nor lake volume but instead...
Influence of coupling of sorption and photosynthetic processes on trace element cycles in natural waters
C. C. Fuller, J.A. Davis
1989, Nature (340) 52-57
Chemical and biological processes have important roles in the transport and cycling of trace elements in natural waters, but their complex interactions are often not well understood. Trace-element concentrations may, for example, be controlled by adsorption-desorption reactions at mineral surfaces, with the equilibrium strongly influenced by pH. Variations in pH...
