Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2542
Introduction to Special section on the California-Arizona crustal transect: Part I Introduction to Special section on the California-Arizona crustal transect: Part I
No abstract available.
Authors
Keith A. Howard, R.W. Simpson, G. B. Haxel
The 40Ar/39Ar thermochronology of the eastern Mojave Desert, California, and adjacent western Arizona with implications for the evolution of metamorphic core complexes The 40Ar/39Ar thermochronology of the eastern Mojave Desert, California, and adjacent western Arizona with implications for the evolution of metamorphic core complexes
Mesozoic thickening and Cenozoic extension resulted in the juxtaposition of upper and middle crustal rocks in the eastern Mojave Desert, southeastern California and western Arizona. The application of 40Ar/39Ar thermochronology to rocks in this region provides information about the timing and nature of thrusting, plutonism, metamorphism, denudation, and detachment faulting. The 40Ar/39Ar...
Authors
D.A. Foster, T.M. Harrison, C. F. Miller, Keith A. Howard
The Denali fault system and Alaska Range of Alaska: Evidence for underplated Mesozoic flysch from magnetotelluric surveys The Denali fault system and Alaska Range of Alaska: Evidence for underplated Mesozoic flysch from magnetotelluric surveys
Regional magnetotelluric surveys recently completed across the central and eastern Alaska Range of Alaska provide evidence for large volumes of conductive rocks beneath the core of the range. These conductive rocks may represent a formerly extensive, but now collapsed, Mesozoic flysch basin formed on the leading edge of the Talkeetna superterrane (amalgamated Wrangellia, Peninsular, and...
Authors
W. D. Stanley, Victor F. Labson, Warren J. Nokleberg, Bela Csejtey, M. A. Fisher
Rock movement and mass wastage in the Grand Canyon Rock movement and mass wastage in the Grand Canyon
No abstract available.
Authors
Richard Hereford, P. W. Huntoon
Geosciences Geosciences
No abstract available.
Authors
Roger D. Borcherdt, N. C. Donovan, D. Eberhart-Phillips, A. Michael, Paul A. Reasenberg, L. Dietz, W. Ellsworth, Daniel J. Ponti, Ray E. Wells, R. A. Haugerud, M. M. Clark, N. T. Hall
Physical and chemical properties of the phosphate deposit on Nauru, western equatorial Pacific Ocean Physical and chemical properties of the phosphate deposit on Nauru, western equatorial Pacific Ocean
No abstract available.
Authors
David Z. Piper, B.J. Loebner, P. Aharon
Chapter 14: Middle Cretaceous silicic metavolcanic rocks in the Kings Canyon area, central Sierra Nevada, California Chapter 14: Middle Cretaceous silicic metavolcanic rocks in the Kings Canyon area, central Sierra Nevada, California
Metamorphosed silicic volcanic and hypabyssal rocks of middle Cretaceous (110 to 100 Ma) age occur in two roof pendants in the Kings Canyon area of the central Sierra Nevada. The metavolcanic remnants are similar in age to or are only slightly older than the voluminous enclosing batholithic rocks. Thus, high to surface levels of the batholith are implied for this region. This is...
Authors
J.B. Saleeby, R. W. Kistler, Samuel Longiaru, James G. Moore, Warren J. Nokleberg
Program to prepare standard figures for grade-tonnage models on a Macintosh Program to prepare standard figures for grade-tonnage models on a Macintosh
Grade-tonnage models are frequency distributions of deposit tonnage and grades of mineral deposits of a specific type. The program described here allows users to prepare standard figures of grade and tonnage distributions and display the deposit name associated with any of the data points. Titles and scales appropriate for most deposit types are plotted automatically for tonnage, Cu, Ni...
Authors
Donald A. Singer, James D. Bliss
Evolution of the Tertiary La Honda basin, central California Evolution of the Tertiary La Honda basin, central California
Tertiary strata of the La Honda basin are exposed in the Santa Cruz Mountains along the central California coast south of San Francisco. The basin fill has a composite thickness of more than 14,500 m and consists of sedimentary and volcanic rocks that in places rest on granitic basement rocks of the Salinia terrane. Paleogene strata are mainly turbidite sandstone and hemipelagic mudstone...
Authors
Richard G. Stanley
Review of paleomagnetic data from the Klamath Mountains, Blue Mountains, and Sierra Nevada; Implications for paleogeographic reconstructions Review of paleomagnetic data from the Klamath Mountains, Blue Mountains, and Sierra Nevada; Implications for paleogeographic reconstructions
Paleomagnetic studies of the Klamath Mountains, Blue Mountains, Sierra Nevada, and northwestern Nevada pertain mostly to Jurassic and Cretaceous rocks, but some data also are available for Permian and Triassic rocks of the region. Large vertical-axis rotations are indicated for rocks in many of the terranes, but few studies show statistically significant latitudinal displacements. The...
Authors
Edward A. Mankinen, William P. Irwin
Epithermal gold-siver deposits in the western United States: time-space products of evolving plutonic, volcanic and tectonic environments Epithermal gold-siver deposits in the western United States: time-space products of evolving plutonic, volcanic and tectonic environments
The western United States has been the locus of considerable subaerial volcanic and plutonic igneous activity since the mid-Mesozoic. After the destruction of the Jurassic-Cretaceous magmatic arc-trench system, subduction was re-established in the Late Mesozoic with low-angle underthrusting of the oceanic plate beneath western North America. This resulted in crustal shortening during the...
Authors
Byron R. Berger, Harold F. Bonham