Ore deposits of the western United States in relation to mass distribution in the crust and mantle

Kutina, Jan; Hildenbrand, Thomas G.

doi:10.1130/0016-7606(1987)99<30:odotwu>2.0.co;2

Cited by 9 publications

(4 citation statements)

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“…On the other hand, Titley [1987] has shown that the Ag:Au ratios of ore deposits in Arizona, independent of age or type, correlate with the geology and Ag:Au ratio of their crustal domains. A crustal source of precious metal in the northwestern United States is consistent with the spatial association of the majority of the ore deposits with medium to large, topographically high regions of negative Bouguer gravity anomalies that mostly correspond to low-density granitic masses [Kutina and Hildenbrand, 1987].…”

Section: And Conclusionsupporting

confidence: 66%

Tertiary meteoric hydrothermal systems and their relation to ore deposition, northwestern United States and southern British Columbia

Criss¹,

Fleck²,

Taylor³

1991

J. Geophys. Res.

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Tertiary meteoric hydrothermal systems have altered the rocks exposed over more than S% of the land surface of the northwestern United States and southern British Columbia, including at least 25,000 1m? in Idaho. The systems typically involved convective circulation of fluid derived from ordinary meteoric groundwater& around crystallizing, calc-alksline, epizonal plutons eiiiP.laced into coeval volcanic cover rocks.These individual systems had widely ranging "lifetimes" of 10' to 1Cf >:~and operated ~ocally throu~out the Cenozoic, although the most profound devolopment of such activity occurred dunng Eocene time. Individual systems varied in size from a few tens of S'JUBre kilometers (Y ankec: Fork, I~o) or less ~ ~v~ral thousand square kilometers (Sawtooth and Castro nng zones, Idaho) Typically, reg~onsl propyhtization aacompanied the fluid circulation, although th~ .lJ!ghe~-tempe':B~re ~teration assemblages. were ~evel~ed locally as were intense alteration effects (e.g., silicification, senc1tization, etc.) near some ve1ns and m Jrurung districu. A significant amount, PC?bably 25-SO%, of the mineral production and pote!ltial i~ the region is closely related to Tertiary meteonc hydrothermal systems. Oxygen and hydrogen 1sotop•c data clearly demonstrate the close geologic association of meteoric hydrothermal systems amd mineralization in (1) the Paleocene, Cu-Zn-Pb-Mn Main Stage mineralization at Butte, Montana; (2) numerous Eocene epithermal deposits principally valued for Au and Ag but also including significant deposits of Cu, Pb, Zn, F, Sb, etc., as at Republic, Washington, and in several mining districts in the Idaho batholith and the Challi~ volcanic field; (3) several Eocene skarn deposits valued for W (lma, Idaho) and Cu (Mackay, Idaho); (4) Important leadsilver vein and replacement deposits of Tertiary (Bluebell, British Columbia) and of probable Cre~ceous and early Tertiary age (Wood River, Idaho); (S) several potentially economic Mo-, Be-, and U-beanng Eocene "porphyry" plutons; and (6) Miocene epithermal deposits, most prominently the Au and Ag bearing veins at Silver City and DeLamar, Idaho, the Hg deposits at the McDermitt caldera, Nevada and Oregon, and . INIRODUCI10NOxygen and hydrogen isotopic ratios are the only intrinsic properties of H20 that are known to be both variable and easily measured; hence they provide the only unequivocal data on the origin of natural aqueous fluids [Craig et a/., 1956]. Application of these principles proves that fluids derived from meteoric waters played a critical role in the formation of numerous ore deposits of the western United States. Prominent examples are the epithermal Au and Ag deposits of Nevada, such as Tonopah, Goldfield, and the Comstock Lode [Taylor, 1973[Taylor, , 1974aO'Neil and Silberman, 1974], and several copper porphyry and vein deposits [Sheppard et al., 1969[Sheppard et al., , 1971. A particularly important example is the Main Stage mineralization of the zoned Cu-Zn-Pb-Mn deposit at Butte, Montana [Garlick and Epstein, 1966;Sheppard and Ta...

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Section: And Conclusionsupporting

confidence: 66%

Tertiary meteoric hydrothermal systems and their relation to ore deposition, northwestern United States and southern British Columbia

Criss¹,

Fleck²,

Taylor³

1991

J. Geophys. Res.

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“…More regionally, a Precambrian basement map of the midcontinent USA was published by Sims (1990) and Hutchinson et al (1990) related a 1.1 GA mantle plume to the midcontinent rift. The relation of ore deposits in the western USA to mass distribution in the crust and mantle was discussed by Kutina and Hildebrand (1987), the assembly of Proterozoic terranes, southwestern North America was discussed by Karlstrom and Bowring (1988), and the influence of such terranes on Ag and Au ratios in Arizona was discussed by Titley (1987). The metallogenic evolution of tungsten skarns and veins of Laramide age in Mexico were discussed by Mead et al (1988).…”

Section: Crustal Evolution and Geochemistry; Age‐datingmentioning

confidence: 99%

Metallogenesis

Burt

1991

Reviews of Geophysics

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“…Ruppel (Kaufmann and Hanna, 1982;Hanna and others, 1993) in the Dillon quadrangle. Geophysical maps of all of these investigators have contributed to geophysical compilations for the United States and North America (Kutina and Hildenbrand, 1987;Hinze and others, 1988;Hanna and others, 1989).…”

Section: Introductionmentioning

confidence: 99%

Maps showing gravity and aeromagnetic anomalies in the Butte 1° x 2° quadrangle, Montana

Hanna¹,

Hassemer²,

Elliott³

et al. 1994

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Contents II CUSMAPNOTEThis report is one of a series of reports that present, chiefly with maps at a scale of 1:250,000 and 1:500,000, various aspects of the geology, geochemistry, geophysics, and mineral resources of the Butte 1 °X2° quadrangle, southwestem Montana (Elliott and others, 1993). These studies were made mostly under the Conterminous United States Mineral Assessment Program (CUSMAP), the primary purpose of which is to determine the mineral resource potential of selected 1 °X2° quadrangles by means of a multidisciplinary approach. The program is intended to provide information on mineral resources to assist Federal, State, and local governments in formulating minerals policy and land-use policy and to produce sound scientific data that may be of value to private industry and the general public in •mineral exploration and development.

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Ore deposits of the western United States in relation to mass distribution in the crust and mantle

Cited by 9 publications

References 0 publications

Tertiary meteoric hydrothermal systems and their relation to ore deposition, northwestern United States and southern British Columbia

Tertiary meteoric hydrothermal systems and their relation to ore deposition, northwestern United States and southern British Columbia

Metallogenesis

Maps showing gravity and aeromagnetic anomalies in the Butte 1° x 2° quadrangle, Montana

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