A procedure for estimating Bacillus cereus spores in soil and stream-sediment samples — A potential exploration technique
J.R. Watterson
1985, Journal of Geochemical Exploration (23) 243-252
The presence of bacterial spores of the Bacillus cereus group in soils and stream sediments appears to be a sensitive indicator of several types of concealed mineral deposits, including vein-type gold deposits. The B. cereus assay is rapid, inexpensive, and inherently reproducible. The test, currently under investigation for its potential in mineral...
U-Pb isotopic evidence for the accretion of a continental microplate in the Zalm region of the Saudi Arabian Shield.
J. S. Stacey, R.A. Agar
1985, Journal of the Geological Society (142) 1189-1203
This area includes three of the main tectonic units of the Arabian Shield: the Afif continental terrain, the Nabitah suture with its associated mobile belt, and the Asir ensimatic arc terrain. U/Pb zircon data from a pelitic garnet-sillimanite gneiss show that the Kabib formation in the S of the Afif...
SOLVING THE TWO-DIMENSIONAL DIFFUSION FLOW MODEL.
T. V. Hromadka II, Chintu Lai
1985, Conference Paper
A simplification of the two-dimensional (2-D) continuity and momentum equations is the diffusion equation. To investigate its capability, the numerical model using the diffusion approach is applied to a hypothetical failure problem of a regional water reservoir. The model is based on an explicit, integrated finite-difference scheme, and the floodplain...
Significance of the Goniatite Bilinguites eliasi and Associated Biotas, Parkwood Formation and Bangor Limestone, Northwestern Alabama
T. W. Henry, M. Gordon Jr., S. P. Schweinfurth, W.H. Gillespie
1985, Journal of Paleontology (59) 1138-1145
The Bangor Limestone contains conodonts, smaller calcareous foraminifers, and a sparse marine macrofauna dating it as late or latest Chesterian (Late Mississippian). The Parkwood Formation, a paralic sequence disconformably overlying the Bangor, has yielded a fauna containing the reticuloceratid ammonoid Bilinguites eliasi Manger and Saunders which permits correlation of the...
Seismic and geochemical evidence for shallow gas in sediment on Navarin continental margin, Bering Sea
Paul R. Carlson, Margaret Golan-Bac, Herman A. Karl, Keith A. Kvenvolden
1985, American Association of Petroleum Geologists Bulletin (69) 422-436
Marine seismic studies coupled with geochemical investigations demonstrate that hydrocarbon gases are ubiquitous in the near-surface (<= 250 m or 820 ft depth) sediment of the Navarin continental margin in the northern Bering Sea. Three types of acoustic anomalies appear to be related to the presence of gas in the...
REGIONAL GROUND-WATER-QUALITY NETWORK DESIGN.
William E. Templin
Schmidt Kenneth D., editor(s)
1985, Conference Paper
This paper describes the approach used in designing a regional network to monitor the complex ground-water-quality conditions in the San Joaquin Valley, California. The actual network approximates the ideal network with the constraint of primarily using wells that are already being monitored by someone for some purpose. Further inventories of...
Carboniferous U-Pb age of the Sebago batholith, southwestern Maine: Metamorphic and tectonic implications
J.H. Aleinikoff, R. H. Moench, J.B. Lyons
1985, Geological Society of America Bulletin (96) 990-996
Two phases (pink and white granite) of the Sebago batholith of southwestern Maine have been dated by the U-Pb zircon method. Identical upper concordia intercepts of both rocks indicate an intrusive age of 325 ± 3 m.y. for the batholith. The lower intercept...
10Be analysis of a Quaternary weathering profile in the Virginia Piedmont
M.J. Pavich, Louis Brown, J. Nathalie Valette-Silver, Jeffrey Klein, Roy Middleton
1985, Geology (13) 39-41
Samples from a residual weathering profile in the Virginia Piedmont have been analyzed for cosmogenic 10Be. Concentrations are highest in clay-rich soil and decrease exponentially to a depth of about 15 m. Despite uncertainties about the processes by which 10Be may be intercepted before entering...
Lognormal field size distributions as a consequence of economic truncation
E. D. Attanasi, L.J. Drew
1985, Journal of the International Association for Mathematical Geology (17) 335-351
The assumption of lognormal (parent) field size distributions has for a long time been applied to resource appraisal and evaluation of exploration strategy by the petroleum industry. However, frequency distributions estimated with observed data and used to justify this hypotheses are conditional. Examination of various observed field size distributions across...
Mesozoic ash-flow caldera fragments in southeastern Arizona and their relation to porphyry copper deposits
P. W. Lipman, D.A. Sawyer
1985, Geology (13) 652-656
Jurassic and Upper Cretaceous volcanic and associated granitic rocks in southeast Arizona are remnants of large composite silicic volcanic fields, characterized by voluminous ash-flow tuffs and associated calderas. Presence of 10–15 large caldera fragments is inferred primarily from (1) ash-flow deposits more than...
Adjustment of geochemical background by robust multivariate statistics
D. Zhou
1985, Journal of Geochemical Exploration (24) 207-222
Conventional analyses of exploration geochemical data assume that the background is a constant or slowly changing value, equivalent to a plane or a smoothly curved surface. However, it is better to regard the geochemical background as a rugged surface, varying with changes in geology and environment. This rugged surface can...
Intraband radiometric performance of the Landsat Thematic Mappers.
H. H. Kieffer, D.A. Cook, E. M. Eliason, P.T. Eliason
1985, Photogrammetric Engineering and Remote Sensing (51) 1331-1350
Radiometric characteristics have been examined of the Landsat-4 and Landsat-5 Thematic Mappers (TMs) that can be established without absolute calibration of spectral data. This analysis is based on radiometrically and geometrically raw (B-type) data of both uniform (flat-field) and high-contrast scenes. Subscenes selected for uniform radiance were used to characterized...
SAS program for quantitative stratigraphic correlation by principal components
M.E. Hohn
1985, Computers & Geosciences (11) 471-477
A SAS program is presented which constructs a composite section of stratigraphic events through principal components analysis. The variables in the analysis are stratigraphic sections and the observational units are range limits of taxa. The program standardizes data in each section, extracts eigenvectors, estimates missing range limits, and computes the...
STATE WATER RESOURCES RESEARCH INSTITUTE PROGRAM: GROUND WATER RESEARCH.
James S. Burton
Schmidt Kenneth D., editor(s)
1985, Conference Paper
This paper updates a review of the accomplishments of the State Water Resources Research Program in ground water contamination research. The aim is to assess the progress made towards understanding the mechanisms of ground water contamination and based on this understanding, to suggest procedures for the prevention and control of...
Segmentation of mid-ocean ridges
Hans Schouten, Kim D. Klitgord, J.A. Whitehead
1985, Nature (317) 225-229
Studies of mid-ocean ridges in the Pacific and Atlantic oceans show that the volcanism that forms the oceanic crust along the spreading-plate boundaries is concentrated at regular intervals related to spreading rate. This observation and a new calculation for a Rayleigh-Taylor type of gravitational instability of a partially molten mantle...
Nitrogen and phosphorus speciation and flux in a large Florida river wetland System
John F. Elder
1985, Water Resources Research (21) 724-732
Hydrologic measurements and analyses of various nitrogen and phosphorus species were made on the Apalachicola River system in northern Florida in 1979 and 1980. Annual outflows of total nitrogen (TN) and total phosphorus (TP) were not substantially different from annual inflows. However, there was significant net import of ammonia and...
YELLOWSTONE MAGMATIC-HYDROTHERMAL SYSTEM, U. S. A.
R.O. Fournier, A.D. Pitt
Stone Claudia, editor(s)
1985, Conference Paper
At Yellowstone National Park, the deep permeability and fluid circulation are probably controlled and maintained by repeated brittle fracture of rocks in response to local and regional stress. Focal depths of earthquakes beneath the Yellowstone caldera suggest that the transition from brittle fracture to quasi-plastic flow takes place at about...
Viral diseases of fish: first report of carp pox in golden ide (Leuciscus idus) in North America
P. E. McAllister, B. C. Lidgerding, R. L. Herman, L.C. Hoyer, J. Hankins
1985, Journal of Wildlife Diseases (21) 199-204
Carp pox, a putative viral disease exotic to North America, occurred in golden ide 1 yr after the fish were imported into the United States from the Federal Republic of Germany. The raised, white, plaque-like lesions, which occurred on about 5% of the...
Characteristics of the aftershock sequence of the Borah Peak, Idaho, earthquake determined from digital recordings of the events
John Boatwright
1985, Bulletin of the Seismological Society of America (75) 1265-1284
The U.S. Geological Survey, Menlo Park, deployed and maintained a network of twelve digital instruments over the 2 weeks following the 28 October 1983 Borah Peak, Idaho, earthquake. The network recorded 45 events with M ≧ 3.0, and 6 events with M ≦ 4.0. The epicenters are located in a...
Recent movement on the Garlock Fault as suggested by water level fluctuations in a well in Fremont Valley, California
Diane K. Lippincott, John D. Bredehoeft, W. R. Moyle Jr.
1985, Journal of Geophysical Research Solid Earth (90) 1911-1924
Water levels have been continuously recorded since March 1978 in a well in Fremont Valley, where several strands of the adjacent Garlock fault zone have exhibited both left-lateral displacement and components of normal displacement. Differences in water levels indicate that a fault segment lies between the observation well and a...
The copper-nickel concentration log: A tool for stratigraphic interpretation within the ultramafic and basal zones of the stillwater complex, Montana
L.J. Drew, W.J. Bawiec, N.J. Page, J.H. Schuenemeyer
1985, Journal of Geochemical Exploration (23) 117-137
An analogue to the electric well log was devised for copper-nickel concentration drill-hole data from the Basal and lower part of the Ultramafic zones of the Stillwater Complex using automated data processing. The copper-nickel concentration logs graphically represent intensity (concentration) values that reflect the distribution of the elements in sulfide...
PREPRO: a computer program for encoding regional exploration data for use in characteristic analysis
N.J. Bridges, J.T. Hanley, R.B. McCammon
1985, Computers & Geosciences (11) 513-519
The preprocessor (PREPRO) computer program offers the exploration geologist a variety of options for encoding regional exploration data into ternary form for use in characteristic analysis. PREPRO's options include variable-input formats, cursor input, ordering among a set of input variables, and selectable ternary transformations. Moreover, the program provides for the...
Seismic structure and stratigraphy of northern edge of Bahaman-Cuban collision zone
M. M. Ball, R. G. Martin, W. D. Bock, R. E. Sylwester, R. M. Bowles, D. Taylor, E. L. Coward, J. E. Dodd, L. Gilbert
1985, American Association of Petroleum Geologists Bulletin (69) 1275-1294
Common-depth-point (CDP) seismic reflection data in the southwestern Bahamas reveal the northern edge of the tectonized zone that resulted from the late Mesozoic-early Cenozoic collision of Cuba and the Bahamas. Two seismic facies are present: a basin facies and a shallow-water carbonate-platform facies. In Santaren Channel, between Cay Sal and...
Anomalous 13C enrichment in modern marine organic carbon
M.A. Arthur, W.E. Dean, George E. Claypool
1985, Nature (315) 216-218
Marine organic carbon is heavier isotopically (13C enriched) than most land-plant or terrestrial organic C1. Accordingly, ??13C values of organic C in modern marine sediments are routinely interpreted in terms of the relative proportions of marine and terrestrial sources of the preserved organic matter2,3. When independent geochemical techniques are used...
More on the alleged 1970 geomagnetic jerk
L.R. Alldredge
1985, Physics of the Earth and Planetary Interiors (39) 255-264
French and United Kingdom workers have published reports describing a sudden change in the secular acceleration, called an impulse or a jerk, which took place around 1970. They claim that this change took place in a period of a year or two and that the sources of the alleged jerk...
