Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2481
Neogene sedimentation on the outer continental margin, southern Bering Sea Neogene sedimentation on the outer continental margin, southern Bering Sea
Neogene sedimentary rocks and sediments from sites on the outer continental margin in the southern Bering Sea and on the Alaska Peninsula are dominated by volcanic components that probably were eroded from an emergent Aleutian Ridge. A mainland continental source is subordinate. Most sediment in the marine environment was transported to the depositional sites by longshore currents...
Authors
T.L. Vallier, M.B. Underwood, J.V. Gardner, J.A. Barron
Comments and replies on ‘Collision-deformed Paleozoic continental margin, western Brooks Range, Alaska’: Reply Comments and replies on ‘Collision-deformed Paleozoic continental margin, western Brooks Range, Alaska’: Reply
No abstract available.
Authors
Michael Churkin, Warren J. Nokleberg
Allochthonous Jurassic ophiolite in northwest Washington Allochthonous Jurassic ophiolite in northwest Washington
Fragments of Jurassic ophiolite having U-Pb zircon ages narrowly grouped at 160 to 170 m.y. are widespread over parts of northwest Washington. The Haystack thrust fault is inferred to mark the base of the ophiolite in the San Juan Islands and adjacent Cascade foothills; other bodies of mafic and ultramafic rock in the western Cascades may be klippen of the Haystack thrust plate. The...
Authors
John T. Whetten, R. E. Zartman, Richard J. Blakely, David L. Jones
Sedimentology and geochemistry of surface sediments, outer continental shelf, southern Bering Sea Sedimentology and geochemistry of surface sediments, outer continental shelf, southern Bering Sea
Present-day sediment dynamics, combined with lowerings of sea level during the Pleistocene, have created a mixture of sediments on the outer continental shelf of the southern Bering Sea that was derived from the Alaskan Mainland, the Aleutian Islands, and the Pribilof ridge. Concentrations of finer-grained, higher-organic sediments in the region of the St. George basin have further...
Authors
J.V. Gardner, W.E. Dean, T.L. Vallier
Preliminary geologic map of the Loma-Prieta Quadrangle, Santa Cruz and Santa Clara counties, California Preliminary geologic map of the Loma-Prieta Quadrangle, Santa Cruz and Santa Clara counties, California
No abstract available.
Authors
T.W. Dibblee, Earl E. Brabb
Some quantitative properties of mineral deposits Some quantitative properties of mineral deposits
No abstract available.
Authors
W. D. Menzie, Donald A. Singer
What can grade-tonnage relations really tell us? What can grade-tonnage relations really tell us?
No abstract available.
Authors
Donald A. Singer, John H. DeYoung
Metamorphic infrastructure in the northern Ruby Mountains, Nevada Metamorphic infrastructure in the northern Ruby Mountains, Nevada
The metamorphic complex of the northern Ruby Mountains in northeastern Nevada exposes Paleozoic strata that are metamorphosed to sillimanite grade, migmatized, and recumbently folded. Nappes are variously overturned to the east, north, south, and west. The deeper part of this metamorphic infrastructure is a migmatitic zone pervaded by pegmatitic two-mica granite. A structurally higher...
Authors
Keith A. Howard
Geological Survey research 1980 Geological Survey research 1980
A summary of recent significant scientific and economic results accompanied by a list of geologic, hydrologic, and cartographic investigations in progress.
Authors
Water Resources Division U.S. Geological Survey
Nature and origin of metalliferous sediment in DOMES Site C, Pacific manganese nodule province Nature and origin of metalliferous sediment in DOMES Site C, Pacific manganese nodule province
No abstract available.
Authors
James L. Bischoff, David Z. Piper, Paula Quinterno
Tertiary paleontology and stratigraphy of the central Santa Cruz Mountains, California Coast Ranges Tertiary paleontology and stratigraphy of the central Santa Cruz Mountains, California Coast Ranges
No abstract available.
Authors
J. C. Clark, E. E. Brabb, W.O. Addicott