Publications
Here you will find publications, reports and articles produced by Energy and Mineral scientists. For a comprehensive listing of all USGS publications, click the button below.
Filter Total Items: 1319
Integrating spatial and frequency information in the search for kuroko deposits of the Hokuroku District, Japan Integrating spatial and frequency information in the search for kuroko deposits of the Hokuroku District, Japan
A new method (FINDER) that uses the area of influence and Bayesian statistics to aid in selection of target areas on the basis of one or more variables and multiple observations was tested with drill hole data. A previously defined bimodal distribution of Na 2 O with the low sodium group confined to a 1.5 X 3.0-km zone beneath the cluster of deposits at Fukazawa was used as a control...
Authors
Donald A. Singer, Ryoichi Kouda
The relative contribution of accretion, shear, and extension to Cenozoic tectonic rotation in the Pacific Northwest The relative contribution of accretion, shear, and extension to Cenozoic tectonic rotation in the Pacific Northwest
Large Cenozoic clockwise rotations defined by paleomagnetic data are an established fact in the Pacific Northwest, and many tectonic models have been proposed to explain them, including (1) rotation of accreted oceanic microplates during docking, (2) dextral shear between North America and northward-moving oceanic plates to the west, and (3) microplate rotation in front of an expanding...
Authors
Ray E. Wells, Paul L. Heller
Models of grades and tonnages of some lode tin deposits Models of grades and tonnages of some lode tin deposits
Descriptive and grade/tonnage models have recently been built for many types of deposits. Such models consist of descriptions of mineralogy, host rocks, ore textures, controls, alteration, geochemical signatures, age, and tectonic settings, together with statistical models of grades, tonnages, and contained metal of deposits of each type. The models are used to identify areas that may...
Authors
W. D. Menzie, B.L. Reed, Donald A. Singer
Paleomagnetic results from the Shasta Bally Plutonic Belt in the Klamath Mountains Province, northern California Paleomagnetic results from the Shasta Bally Plutonic Belt in the Klamath Mountains Province, northern California
Available paleomagnetic data show approximately 100° of clockwise rotation for Permian and Triassic strata of the Eastern Klamath terrane. Jurassic strata of this terrane are rotated approximately 60° clockwise, which is comparable to rotations reported for Jurassic plutons that occur elsewhere in the Klamath Mountains province. Paleomagnetic data obtained during the present study from...
Authors
Edward A. Mankinen, William P. Irwin, C. Sherman Gromme
Reconnaissance geologic map of the Pilot Creek Quadrangle, Humboldt and Trinity counties, California Reconnaissance geologic map of the Pilot Creek Quadrangle, Humboldt and Trinity counties, California
No abstract available.
Authors
K. R. Aalto, William Porter Irwin, H.M. Kelsey
Element concentrations in soils and other surficial materials of Alaska Element concentrations in soils and other surficial materials of Alaska
Mean concentrations of 35 elements, ash yields, and pH have been estimated for samples of sils and other unconsolidated surficial materials from 266 collection locations throughout Alaska. These background values can be applied to studies of environmental geochemistry and health, wildlife management, and soil-forming processes in cold climates and to computation of element abundances on...
Authors
L. P. Gough, R. C. Severson, H.T. Shacklette
Vitrinite reflectance and illite crystallinity, Franciscan central belt and Yolla Bolly terrane, northern California Vitrinite reflectance and illite crystallinity, Franciscan central belt and Yolla Bolly terrane, northern California
No abstract available.
Authors
M.B. Underwood, R.H. Strong, M.C. Blake
Preliminary geologic map of the Monkeys Head Quadrangle, Mohave and La Paz counties, Arizona Preliminary geologic map of the Monkeys Head Quadrangle, Mohave and La Paz counties, Arizona
No abstract available.
Authors
David R. Sherrod
Geologic map and structure sections of the Loma Prieta 7 1/2' quadrangle, Santa Clara and Santa Cruz Counties, California Geologic map and structure sections of the Loma Prieta 7 1/2' quadrangle, Santa Clara and Santa Cruz Counties, California
No abstract available.
Authors
Robert J. McLaughlin, Joseph C. Clark, Earl E. Brabb
Crustal extension along a rooted system of imbricate low-angle faults: Colorado River extensional corridor, California and Arizona Crustal extension along a rooted system of imbricate low-angle faults: Colorado River extensional corridor, California and Arizona
The upper 10 to 15 km of crystalline crust in the 100-km-wide Colorado River extensional corridor of mid-Tertiary age underwent extension along an imbricate system of gently dipping normal faults. Detachment faults cut gently down-section eastward in the direction of tectonic transport from a headwall breakaway, best expressed in the Old Woman Mountains, California. Successively higher...
Authors
Keith A. Howard, B.E. John
Thermal maturity of tectonostratigraphic terranes within the Franciscan Complex, California Thermal maturity of tectonostratigraphic terranes within the Franciscan Complex, California
Indicators of organic metamorphism provide valuable tools for analyzing the thermal history of tectonostratigraphic terranes. Paleotemperature estimates derived from vitrinite reflectance, for example, are more precise than values based upon inorganic mineral assemblages in low‐grade rocks. Isothermal geometries must be interpreted within the context of structural and stratigraphic data...
Authors
M.B. Underwood, M. Clark Blake, D. G. Howell
Comment and reply on "Correlation of the Peach Springs Tuff, a large-volume Miocene ignimbrite sheet in California and Arizona" Comment and reply on "Correlation of the Peach Springs Tuff, a large-volume Miocene ignimbrite sheet in California and Arizona"
No abstract available.
Authors
S.K. Mittwede, A. F. Glazner, Keith A. Howard, D. M. Miller