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Publications

Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center

Filter Total Items: 2494

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

Adsorption of selenium by amorphous iron oxyhydroxide and manganese dioxide Adsorption of selenium by amorphous iron oxyhydroxide and manganese dioxide

This work compares and models the adsorption of selenium and other anions on a neutral to alkaline surface (amorphous iron oxyhydroxide) and an acidic surface (manganese dioxide). Selenium adsorption on these oxides is examined as a function of pH, particle concentration, oxidation state, and competing anion concentration in order to assess how these factors might influence the mobility...
Authors
Laurie S. Balistrieri, T. T. Chao

Extensional faulting in the southern Klamath Mountains, California Extensional faulting in the southern Klamath Mountains, California

Large northeast striking normal faults in the southern Klamath Mountains may indicate that substantial crustal extension occurred during Tertiary time. Some of these faults form grabens in the Jurassic and older bedrock of the province. The grabens contain continental Oligocene or Miocene deposits (Weaverville Formation), and in two of them the Oligocene or Miocene is underlain by Lower
Authors
R.A. Schweickert, W. P. Irwin
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