Preliminary investigation of the elemental variation and diagenesis of a tabular uranium deposit, La Sal Mine, San Juan County, Utah
Robert A. Brooks, John A. Campbell
1976, Open-File Report 76-287
Ore in the La Sal mine, San Juan County, Utah, occurs as a typical tabular-type uranium deposit of the-Colorado Plateau. Uranium-vanadium occurs in the Salt Wash Member of the Jurassic Morrison Formation. Chemical and petrographic analyses were used to determine elemental variation and diagenetic aspects across the orebody. Vanadium is...
Appraisal of water resources in the Hackensack River basin, New Jersey
L.D. Carswell
1976, Water-Resources Investigations Report 76-74
The Hackensack River basin, in the northern part of the New Jersey-New York metropolitan area, includes some of the most highly urbanized areas in the United States as well as a largely undeveloped 23.4 square mile area of tidal marsh referred to as the Hackensack Meadows. Bedrock in the Hackensack...
Summary of geology and ground-water resources of Passaic County, New Jersey
L.D. Carswell, J.G. Rooney
1976, Water-Resources Investigations Report 76-75
Ground water in Passaic County occurs in intergranular openings of unconsolidated stratified deposits of Quaternary age and in joints and fractures in consolidated rocks of Precambrian, Paleozoic, and Triassic age.The Brunswick Formation of Triassic age is the most important aquifer in the southeastern one-third of Passaic County. Reported yields of public supply and...
Estudio general de la region del Lago Titicaca evaluando en forma preliminar un sistema de analisis interactivo de imagenes multiespectrales
C.E. Brockmann, William D. Carter
1976, Revista tecnica de Yacimientos Petroliferos fiscales Bolivianos (5) 5-31
ERTS-1 digital data in the form of computer compatible tapes provide the geoscientist with an unusual opportunity to test the maximum flexibility of the satellite system using interactive computers, such as the General Electric Image 100 System. Approximately 9 hours of computer and operator time were used to analyze...
Hydrogeochemistry of Bermuda: A case history of ground-water diagenesis of biocalcarenites
L.N. Plummer, H. L. Vacher, F.T. MacKenzie, O.P. Bricker, L.S. Land
1976, Geological Society of America Bulletin (87) 1301-1316
Bermuda is composed of relatively young skeletal limestones currently undergoing diagenesis by the ground water passing through them. The saturated zone consists of separate fresh-water bodies laterally surrounded and underlain by extensive brackish aureoles, in which the meteoric water is mixed with sea water. The meteoric water enters the aquifer...
Geology of the Brysch uranium mine, Karnes County, Texas
Kendall A. Dickinson, Michael W. Sullivan
1976, Journal of Research of the U.S. Geological Survey (4) 397-404
Approximately 13,700 tons (12,400 tonnes) of oxidized uranium ore, averaging about 0.1 percent U2O8, was mined during 1966 and 1967 from the lower unit of the Deweesville Sandstone Member of the upper Eocene Whitsett Formation, from depths of 75 to 90 feet (23-27 m). The mine is in the Karnes...
Identification of excess 40Ar by the 40Ar 39Ar, age spectrum technique
M. A. Lanphere, G. Brent Dalrymple
1976, Earth and Planetary Science Letters (32) 141-148
40Ar/39Ar incremental heating experiments on igneous plagioclase, biotite, and pyroxene that contain known amounts of excess40Ar indicate that saddle-shaped age spectra are diagnostic of excess40Ar in igneous minerals as well as in igneous rocks. The minima in the age spectra approach but...
Evidence of the impacting body of the Ries crater - the discovery of Fe-Cr-Ni veinlets below the crater bottom
Goresy A. El, E. C. T. Chao
1976, Earth and Planetary Science Letters (31) 330-340
Fe-Cr-Ni particles and veinlets have been discovered in the top 15 m of the compressed zone with abundant shatter cones below the bottom of the Ries crater. The metallic particles are less than a few microns across. They occur in various minerals along healed intergranular and locally in intragranular microfractures...
Lithium in sediments and brines--how, why and where to search
James D. Vine
1975, Journal of Research of the U.S. Geological Survey (3) 479-485
The possibility of using lithium in batteries to power electric vehicles and as fuel for thermonuclear power has focused attention on the limited resources of lithium other than in pegmatite minerals. The Clayton Valley, Nev., subsurface lithium brine has been the major source of lithium carbonate since about 1967, but...
The orthoenstatite to clinoenstatite transformation by shearing and reversion by annealing: Mechanism and potential applications
R. S. Coe, Stephen H. Kirby
1975, Contributions to Mineralogy and Petrology (52) 29-55
Clinoenstatite (CE) was produced by deforming single-crystal specimens of ortho-enstatite (OE) in several different sorta of experiments. Examination with light and trans-mission electron microscopes shows that the transformation is coherent and involves a macroscopic shear on (100) [001] through an angle of 12.8±1.3 °, in good...
The Pikes Peak batholith, Colorado front range, and a model for the origin of the gabbro-anorthosite-syenite-potassic granite suite
F. Barker, D. R. Wones, W. N. Sharp, G. A. Desborough
1975, Precambrian Research (2) 99-160
This study of the Pikes Peak batholith includes the mineralogy and petrology of quartz syenite at West Creek and of fayalite-bearing and fayalite-free biotite granite near Mount Rosa; major element chemistry of the batholith; comparisons with similar postorogenic, intracratonic, sodic to potassic intrusives; and genesis of the batholith.The batholith is...
Mineral deposits in western Saudi Arabia; a preliminary report
Ralph Jackson Roberts, William R. Greenwood, Ronald G. Worl, F. C. W. Dodge, Thor H. Kiilsgaard
1975, Open-File Report 75-654
Mineral deposits in Saudi Arabia include a variety of deposits which were formed in many geologic environments. These include magmatic and late magmatic deposits in igneous masses, contact metamorphic deposits along the margins of igneous bodies, and stratiform sulfide deposits and veins. Notable deposits of sedimentary origin include deposits of...
Geohydrologic reconnaissance of the upper Potomac River basin
Frank W. Trainer, Frank A. Watkins
1975, Water Supply Paper 2035
The upper Potomac River basin, in the central Appalachian region in Pennsylvania, Maryland, Virginia, and West Virginia, is a humid temperate region of diverse fractured rocks. Three geohydrologic terranes, which underlie large parts of the basin, are described in terms of their aquifer characteristics and of the magnitude and duration...
A mineralogical study of the Guanajuato, Mexico, silver ores
Ivan Franklin Wilson, Charles Milton, Joseph Rollins Houston
1975, Open-File Report 75-70
The silver-gold ores now being worked in the Guanajuato, Mexico, mining district consist chiefly of argentite and native gold-silver, with minor amounts of polybasite, pyrargyrite, and some argyrodite, a silver germanium sulfide. With these are always associated galena, sphalerite, chalcopyrite, pyrite, and minor amounts of marcasite. The gangue is generally...
Water availability in Perry County, Alabama
Philip C. Reed, J.R. Willmon, Patrick O. Jefferson
1975, Open-File Report 75-482
The principal sources of large quantities of ground water in Perry County are sand and gravel aquifers in the Coker, Gordo, and Eutaw Formations of the Upper Cretaceous Series. Upper Cretaceous deposits, which dip to the southwest at about 35 feet per mile, range in thickness (d from about 400...
Evaluation and proposed study of potential ground-water supplies, Gallup area, New Mexico
William L. Hiss
1975, Open-File Report 75-522
The ground-water potential of 5 areas in central-western New Mexico within 85 miles (135 km) of Gallup, N. Mex. was evaluated by reviewing the published literature, inspecting aerial and space photographs, and interviewing ranchers and personnel employed by well-drilling and mineral-exploration companies by telephone. The San Andres Limestone and underlying...
Water availability and geology of Hale County, Alabama
Marvin E. Davis, Thomas H. Sanford Jr., Patrick O. Jefferson
1975, Open-File Report 75-452
Geologic units that underlie and crop out in Hale County include the Tuscaloosa Group, Eutaw Formation, and Selma Group of Late Cretaceous age, and terrace deposits and alluvium of Quaternary age. The Cretaceous units dip southwest about 35 feet per mile and strike northwest. They consist chiefly of deposits of...
Summary appraisals of the nation's ground-water resources – Rio Grande region
S. W. West, W. L. Broadhurst
1975, Professional Paper 813-D
The Rio Grande is an interstate and international stream which begins in high mountains of Colorado, flows across New Mexico, and forms the boundary between Texas and Mexico. Precipitation ranges from 8 inches (20 em) to more than 30 inches (76 em), but irrigation is required for growing crops throughout...
Water availability, Jefferson County, Alabama
Alfred L. Knight
1975, Open-File Report 75-461
The average annual precipitation in Jefferson County is about 53 inches (1,346.2 millimeters) or about 2,820 mgd (million gallons per day), which is equivalent to 124 m3/s (cubic meters per second). Part of the rainfall (about 1,130 mgd or 50 m3/s) runs off directly into streams, and the remaining 1,690...
Geochemical Exploration Techniques Applicable in the Search for Copper Deposits
Maurice A. Chaffee
1975, Professional Paper 907-B
Geochemical exploration is an important part of copper-resource evaluation. A large number of geochemical exploration techniques, both proved and untried, are available to the geochemist to use in the search for new copper deposits. Analyses of whole-rock samples have been used in both regional and local geochemical exploration surveys in the...
Studies for seismic zonation of the San Francisco Bay region
Roger D. Borcherdt
1975, Professional Paper 941-A
The analyses presented in the preceding six papers show that the geologic setting of the San Francisco Bay region has a dominant influence on potential earthquake hazards. The strong correlation between geologic conditions and the amount of earthquake damage in 1906 emphasizes the importance of this influence and demonstrates the...
Radiometric dates from Alaska: A 1975 compilation
D. L. Turner, Donald Grybeck, Frederic H. Wilson
1975, Alaska Division of Geological & Geophysical Surveys Special Report DGGS SR 10
The following table of radiometric dates from Alaska includes published material through 1972 as well as some selected later data. The table includes 726 mineral and whole-rock dates determined by the K-Ar, Rb-Sr, fission-track U-Pb, and Pb-alpha techniques.The data are organized in alphabetical order of the 1:250,000 scale quadrangles in...
Absolute age of disseminated uraninite in Wheeler Basin, Grand County, Colorado
K.R. Ludwig, E. J. Young
1975, Journal of Research of the U.S. Geological Survey (3) 747-751
Uranium and lead isotopic analyses of monazlte and uraninite from the disseminated uraninite occurrence at Wheeler Basin, Grand County, Colo., indicate that these minerals formed 1,446±20 m.y. ago. This time correlates well with intrusion of the Silver Plume Granite. The uraninite and monazite were also affected by a later disturbance...
Diagenesis of Miocene siliceous shales, Temblor Range, California
K. J. Murata, R.R. Larson
1975, Journal of Research of the U.S. Geological Survey (3) 553-566
Siliceous Monterey Shale and related shales of the Temblor Range, Calif., are subdivided into three depth-controlled zones characterized by different forms of silica. These are, in descending stratigraphic order: (1) Biogenic opal zone, with remains of diatoms and other siliceous organisms, (2) diagenetic cristobalite zone, and (3) diagenetic quartz zone....
Geology of Bulgaria: A review
Richard M. Foose, Frank T. Manheim
1975, AAPG Bulletin (59) 303-335
Bulgaria is in southeastern Europe between reasonably well-described areas of predominantly Alpine crustal deformation on the north and northwest (Carpathians in Romania, Hungary, and Czechoslovakia; Alps in Austria), on the east (Pontides and Taurides in Turkey), and on the west and south (Dinaric Alps in Yugoslavia; Pindos Mountains...
