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Filter Total Items: 945
Publication Thumbnail
Year Published: 1989

Isotopic and trace element variations in the Ruby Batholith, Alaska, and the nature of the deep crust beneath the Ruby and Angayucham Terranes

Thirty-six samples from plutons of the Ruby batholith of central Alaska were collected and analyzed for 22 trace elements, and many were analyzed for the isotopic compositions of Sr, Nd, O, and Pb in order to delimit the processes that produced the diversity of granodioritic to granitic compositions, to deduce the nature of the source of magmas at...

Arth, Joseph G.; Zmuda, Clara C.; Foley, Nora K.; Criss, Robert E.; Patton, W.W.; Miller, T.P.
Isotopic and trace element variations in the Ruby Batholith, Alaska, and the nature of the deep crust beneath the Ruby and Angayucham Terranes; 1989; Article; Journal; Journal of Geophysical Research; Arth, J. G.; Zmuda, C. C.; Foley, N. K.; Criss, R. E.; Patton, Jr, W. W.; Miller, T. P.

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Year Published: 1989

Remarkable isotopic and trace element trends in potassic through sodic Cretaceous plutons of the Yukon-Koyukuk Basin, Alaska, and the nature of the lithosphere beneath the Koyukuk terrane

During the period from 110 to 80 m.y. ago, a 450-km-long magmatic belt was active along the northern margin of Yukon-Koyukuk basin and on eastern Seward Peninsula. The plutons intruded Upper Jurassic(?) and Lower Cretaceous volcanic arc rocks and Cretaceous sedimentary rocks in Yukon-Koyukuk basin and Proterozoic and lower Paleozoic continental...

Arth, Joseph G.; Criss, Robert E.; Zmuda, Clara C.; Foley, Nora K.; Patton, W.W.; Miller, T.P.
Remarkable isotopic and trace element trends in potassic through sodic Cretaceous plutons of the Yukon-Koyukuk basin, Alaska, and the nature of the lithosphere beneath the Koyukuk terrane; 1989; Article; Journal; Journal of Geophysical Research; Arth, J. G.; Criss, R. E.; Zmuda, C. C.; Foley, N. K.; Patton, Jr, W. W.; Miller, T. P.

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Year Published: 1988

Geochemistry of mineralized quartzite beds in the Spokane Formation (Belt Supergroup), Rogers Pass area, Lewis and Clark County, Montana

Connor, Jon J.; McNeal, James M.
Geochemistry of mineralized quartzite beds in the Spokane Formation (Belt Supergroup), Rogers Pass area, Lewis and Clark County, Montana; 1988; B; 1762; Connor, Jon J.; McNeal, James M.

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Year Published: 1988

A BASIC program for locating references cited in geoscience manuscripts

[No abstract available]

Hayba, Daniel O.
A BASIC program for locating references cited in geoscience manuscripts; 1988; Article; Journal; Computers and Geosciences; Hayba, D. O.

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Year Published: 1987

Bibliography and index of the geology of the Creede mining district and vicinity

This bibliography and index of the geology of the Creede mining district and vicinity was prepared in support of the increased number of studies being conducted in conjunction with the proposed deep drilling program at Creede. It was our intent to include in this compilation all papers, abstracts, and maps which contribute any information...

Hayba, Daniel O.; Conte, Constance J.

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Year Published: 1987

White mica geochemistry of the Catheart Mountain porphyry copper deposit, Maine

White micas from hydrothermally altered and mineralized zones in the Catheart Mountain Cu-Mo porphyry deposit have regular compositional variations that are generally related to the contents of copper, total iron, and sulfur in the whole rock. Micas in unmineralized rocks exhibit no such relationship. White mica compositions reflect primarily the...

Ayuso, Robert A.
White mica geochemistry of the Catheart Mountain porphyry copper deposit, Maine; 1987; B; 1803; Ayuso, Robert A.

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Year Published: 1987

Source of lead and mineralizing brines for rossie-type Pb-Zn veins in the Frontenac axis area, New York ( USA).

Veins composed mainly of calcite and some galena, sphalerite, fluorite, and other minerals are widespread in the Frontenac axis area of New York and Ontario. In New York, the veins (Fig. 1) occur mainly west and northwest of Gouverneur (Brown, 1983). The veins, mined in the 1800s for lead, were first described by Emmons (1838). Smyth (1903) called...

Ayuso, Robert; Foley, Nora K.; Brown, C. Erwin
Source of lead and mineralizing brines for rossie-type Pb-Zn veins in the Frontenac axis area, New York ( USA).; 1987; Article; Journal; Economic Geology; Ayuso, R. A.; Foley, N. K.; Brown, C. E.

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Year Published: 1986

Aluminum in hornblende: an empirical igneous geobarometer.

Electron-microprobe analyses of hornblendes from five calc-alkaline plutonic complexes representing low- and high-pressure regimes define a tightly clustered linear trend in terms of total Al (AlT) and tetrahedral Al (Aliv) contents. Data collated from the literature on calcic amphiboles from other plutonic complexes and from phase equilibrium...

Hammarstrom, J.M.; Zen, E.
Aluminum in hornblende: an empirical igneous geobarometer.; 1986; Article; Journal; American Mineralogist; Hammarstrom, J. M.; Zen, E.

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Year Published: 1985

Proceedings of the Second U.S. Geological Survey workshop on the early Mesozoic basins of the Eastern United States

Robinson, Gilpin R.; Froelich, Albert J.
Proceedings of the Second U.S. Geological Survey workshop on the early Mesozoic basins of the Eastern United States; 1985; CIR; 946; edited by Robinson, Gilpin R.; Froelich, Albert J.

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Year Published: 1985

Significance of tourmaline-rich rocks in the Grenville Complex of St. Lawrence County, New York

Feldspathic quartzite and metapelite of Middle Proterozic age north of Gouverneur, N.Y., contain abundant dravite-uvite (magnesian tourmaline). These rocks, more than 1,000 feet thick, are regionally metamorphosed to the upper amphibolite facies, are pyritic, and locally contain porphyroblastic scapolite. The rocks are underlain by talctremolite...

Brown, C. Ervin; Ayuso, Robert A.
Significance of tourmaline-rich rocks in the Grenville Complex of St. Lawrence County, New York; 1985; B; 1626-C; Brown, C. Ervin; Ayuso, Robert A.

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Year Published: 1984

Characteristics of some silver-, and base metal-bearing, epithermal deposits of Mexico and Peru

Introduction Lithotectonic, mineralogical, and geochemical data on two silver- and base metal-bearing deposits from Peru and two from Mexico are compiled to facilitate comparisons with other epithermal deposits. Silver and base metal-bearing deposits of Mexico and Peru constitute an important portion of the world silver production derived from...

Foley, Nora K.
Characteristics of some silver-, and base metal-bearing, epithermal deposits of Mexico and Peru; 1984; OFR; 84-633; Foley, N. K.