Publications
Products (journal articles, reports, fact sheets) authored by current and past scientists are listed below. Please check the USGS Pubs Warehouse for other USGS publications.
Filter Total Items: 1903
Magnetic models of crystalline terrane; accounting for the effect of topography Magnetic models of crystalline terrane; accounting for the effect of topography
Igneous rocks commonly have large magnetic susceptibilities so that high topographic relief in crystalline terrane can produce significant anomalies in aeromagnetic surveys. Topographic anomalies are particularly significant in relatively undeformed volcanic terrane because young volcanic rocks generally have large natural remanent magnetizations as well as large susceptibilities. These...
Authors
Richard Blakely, V. Grauch
Interaction of subsurface brines with oxygenated meteoric water, Ray Point Uranium District, South Texas, USA Interaction of subsurface brines with oxygenated meteoric water, Ray Point Uranium District, South Texas, USA
No abstract available.
Authors
Martin Goldhaber, Richard Wanty, J.R. Chatham, R. Reynolds, D. Langmuir
Rb-Sr, Sm-Nd, K-Ca, O, and H isotopic study of Cretaceous-Tertiary boundary sediments, Caravaca, Spain: evidence for an oceanic impact site Rb-Sr, Sm-Nd, K-Ca, O, and H isotopic study of Cretaceous-Tertiary boundary sediments, Caravaca, Spain: evidence for an oceanic impact site
Isotopic ratios and trace element abundances were measured on samples of Ir-enriched clay at the Cretaceous-Tertiary boundary, and in carbonate and marl from 5 cm below and 3 cm above the boundary. Samples were leached with acetic acid to remove carbonate, and with hydrochloric acid. Leachates and residues were measured. The Sr, Nd, O and H isotopic compositions of the boundary clay...
Authors
D.J. DePaolo, F.T. Kyte, B.D. Marshall, J. O’Neil, J. Smit
Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska Proterozoic zircon from augen gneiss, Yukon-Tanana Upland, east-central Alaska
U-Th-Pb analyses of zircons from an ortho-augen gneiss body in the Yukon-Tanana Upland of east-central Alaska yield strong evidence for the presence of early Proterozoic material in this area. U-Pb data define a chord that intersects concordia at about 2,300 and 345 m.y. We consider two interpretations: (1) the protolith was intruded during the Proterozoic and was subsequently...
Authors
John Aleinikoff, Cynthia Dusel-Bacon, Helen Foster, Kiyoto Futa
Analyses of rocks and stream sediments from the Blue Joint Wilderness study area, Ravalli County, Montana, and the Blue Joint roadless area, Lemhi County, Idaho Analyses of rocks and stream sediments from the Blue Joint Wilderness study area, Ravalli County, Montana, and the Blue Joint roadless area, Lemhi County, Idaho
No abstract available.
Authors
E. Mosier, W. Rehn, Karen Lund, C. Holloway, B. Coxe, R. Yeoman
Stratigraphic and economic significance of Mississippian sequence at North Georgetown Canyon, Idaho Stratigraphic and economic significance of Mississippian sequence at North Georgetown Canyon, Idaho
The Mississippian sequence exposed at North Georgetown Canyon, Idaho is newly recognised as a facies belt, which adds to knowledge of Mississippian stratigraphy and petroleum geology in the Overthrust belt of Idaho, Wyoming, and Utah. In the newly recognized facies belt in the Aspen Range, the Madison Group is represented by the Lodgepole Limestone and Mission Canyon Limestone. The...
Authors
W.J. Sando, Charles Sandberg, R.C. Gutschick
Chemical analyses of samples of rock, minus-0.25-mm stream sediment, and nonmagnetic heavy-mineral concentrate, Mokelumne Wilderness and adjacent RARE II further planning areas, California Chemical analyses of samples of rock, minus-0.25-mm stream sediment, and nonmagnetic heavy-mineral concentrate, Mokelumne Wilderness and adjacent RARE II further planning areas, California
No abstract available.
Authors
Maurice Chaffee, E.H. McKee, R. Hill, W. Speckman, S. Sutley
Mahd adh Dhahab: Precambrian epithermal gold deposit in Saudi Arabia Mahd adh Dhahab: Precambrian epithermal gold deposit in Saudi Arabia
No abstract available.
Authors
Robert Luce, James O’Neil, Robert Rye
Epithermal beryllium deposits in water-laid tuff, western Utah Epithermal beryllium deposits in water-laid tuff, western Utah
Epithermal beryllium deposits in western Utah have distinctive geological and geochemical associations that provide guides to exploration for new resources of beryllium and associated metals. Beryllium deposits at Spor Mountain and the Honeycomb Hills are uniquely associated with topaz-bearing rhyolite of Late Tertiary age and are restricted to porous water-laid tuff and breccia that...
Authors
David Lindsey
Sheeted dikes, gabbro, and pillow basalt in flysch of coastal southern Alaska Sheeted dikes, gabbro, and pillow basalt in flysch of coastal southern Alaska
A Paleocene to Eocene(?) mafic sequence of igneous rocks on Knight Island and a Cretaceous mafic and ultramafic sequence of the Resurrection Peninsula in coastal southern Alaska are characterized by pillow basalts, sheeted dikes, and gabbro intrusions. At both localities, pillow basalts are interbedded with flysch, and the gabbros intrude both the sheeted dikes and the immediately...
Authors
Russell Tysdal, J. Case, G. Winkler, S. Clark
Stratigraphy, conodont dating, and paleotectonic interpretation of the type Milligen Formation (Devonian), Wood River area, Idaho Stratigraphy, conodont dating, and paleotectonic interpretation of the type Milligen Formation (Devonian), Wood River area, Idaho
The Milligen Formation at and near its type locality in the Wood River area is considerably older than and unrelated to rocks of Early Mississippian age called Milligen Formation in the Lost River Range and other ranges of east-central Idaho. Conodont faunas were found in limestones of a thin upper member of the sparsely fossiliferous marine Milligen Formation in its principal reference...
Authors
Charles Sandberg, Wayne Hall, John Batchelder, Claus Axelsen