Publications

Results from our Program’s research and minerals information activities are published in USGS publications series as well as in outside journals. To follow Minerals Information Periodicals, subscribe to the Mineral Periodicals RSS feed.

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Minerals Information Publications

National Mineral Information Center (NMIC) products focus on the worldwide supply of, demand for, and flow of minerals and materials. These products are organized by mineral commodity, geographic area, or monthly/annual statistical compilation.

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January 1, 1986

Geophysics: A reversal of geomagnetic polarity Geophysics: A reversal of geomagnetic polarity

The detailed behaviour of the geomagnetic field during reversals is documented by palaeomagnetists to constrain models of the geomagnetic dynamo. Reversals are studied by measuring the magnetic remanence preserved in rocks to obtain both the direction and intensity of the ancient magnetic field.

Authors

Edward Mankinen

Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Geomagnetism Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geologic Hazards Science Center, Geology, Minerals, Energy, and Geophysics Science Center

January 1, 1986

Relationship of grade, tonnage, and basement lithology in volcanic-hosted epithermal precious-and base-metal quartz-adularia-type districts Relationship of grade, tonnage, and basement lithology in volcanic-hosted epithermal precious-and base-metal quartz-adularia-type districts

Examination of grades, tonnages, and basement rocks for 88 epithermal precious- and base-metal quartz-adularia-type districts in North, Central, and South America, and Japan reveals that the type of basement rock below the mineralized veins is useful for predicting grade and size of deposits. Epithermal districts overlying basement with salt and evaporites, or rocks with trapped sea...

Authors

D.L. Mosier, Donald Singer, T. Sato, N.J. Page

Geology, Energy, and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

January 1, 1986

Preliminary geologic map of Santa Cruz County, California Preliminary geologic map of Santa Cruz County, California

No abstract available.

Authors

Earl Brabb

January 1, 1986

Paleomagnetism and K-Ar ages of volcanic rocks from Long Valley caldera, California Paleomagnetism and K-Ar ages of volcanic rocks from Long Valley caldera, California

Paleomagnetic measurements and K‐Ar age determinations on volcanic rocks from Long Valley caldera, California, have enabled further refinement of eruptive activity within this large silicic volcanic center. K‐Ar age determinations show that postcaldera volcanic eruptions began 0.73 m.y. ago and continued periodically until about 50,000 years ago. The eruptions were not temporally random...

Authors

Edward Mankinen, C. Gromme, G. Dalrymple, Marvin Lanphere, Roy Bailey

January 1, 1986

Southern hemisphere origin of the Cretaceous Laytonville Limestone of California Southern hemisphere origin of the Cretaceous Laytonville Limestone of California

New paleomagnetic, paleontologic, and stratigraphic data from outcrops of the Laytonville Limestone (101 to 88 million years old) support a Southern Hemisphere orgin. A paleomagnetic megaconglomerate test is statistically significant and suggests magnetization at 14?? ?? 5?? south, predating Late Cretaceous to Eocene (70 to 50 million years ago) accretion. Rapid Kula plate movement or...

Authors

J.A. Tarduno, M. McWilliams, W.V. Sliter, H. Cook, M.C. Blake, I. Premoli-Silva

December 31, 1985

Tectonostratigraphic terranes of northern California Tectonostratigraphic terranes of northern California

No abstract available.

Authors

M. Blake, A. Jayko, R. McLaughlin

December 31, 1985

Tectonostratigraphic terranes in southwest Oregon Tectonostratigraphic terranes in southwest Oregon

No abstract available.

Authors

Blake, D.E. Engebretson, A. Jayko, J. Jones

December 31, 1985

Book Review: The Encyclopedia for Applied Geology Book Review: The Encyclopedia for Applied Geology

No abstract available.

Authors

E. Brabb

December 31, 1985

On the line: Losing by a landslide, invited comment On the line: Losing by a landslide, invited comment

No abstract available.

Authors

E. Brabb

Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Landslide Hazards Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geologic Hazards Science Center, Geology, Minerals, Energy, and Geophysics Science Center

December 31, 1985

Stratigraphy and tectonic significance of the Mesozoic tectonostratigraphic terranes of the Vizcaino Peninsula, Baja California Sur, Mexico Stratigraphy and tectonic significance of the Mesozoic tectonostratigraphic terranes of the Vizcaino Peninsula, Baja California Sur, Mexico

No abstract available.

Authors

Thomas Moore

December 31, 1985

Age and tectonics of plutonic belts in accreted terranes of the Klamath Mountains, California and Oregon Age and tectonics of plutonic belts in accreted terranes of the Klamath Mountains, California and Oregon

No abstract available.

Authors

W. P. Irwin

December 31, 1985

Equivalent radiolarian ages from ophiolitic terranes of Cyprus and Oman Equivalent radiolarian ages from ophiolitic terranes of Cyprus and Oman

Radiolarian biostratigraphy shows that umberiferous strata overlying the Troodos ophiolite in Cyprus are Turonian in age and are thus essentially contemporaneous with similar strata that overlie the Samail ophiolite in Oman. However, this radiolarian age is markedly older than Campanian isotopic ages measured on the underlying rocks of the Troodos ophiolite. The revised age for the...

Authors

Charles Blome, William P. Irwin