Regional geology and mineral deposits in and near the central part of the Lemhi Range, Lemhi County, Idaho

Ruppel, E.T.; Lopez, David A.

doi:10.3133/pp1480

Cited by 17 publications

(32 citation statements)

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“…For the lithologic analysis, Ordovician quartzite was combined with the Mesoproterozoic metasedimentary rock because they are both composed of massive sandstone and quartzite (Ruppel and Lopez, 1988). The statistically insignificant number of rock glaciers in areas of igneous bedrock (five alpine valleys (of 171) and two rock glaciers (of 48)), prompted the removal of these alpine valleys from the analysis to eliminate background noise in the statistics.…”

Section: Methodsmentioning

confidence: 99%

“…While local beds of meta-limestone and siltstone exist, the overwhelming majority of the metasedimentary units (N 90%) consist of massively bedded sandstones and quartzites (Ruppel and Lopez, 1988). The Paleozoic limestones are a much weaker rock type than the metasedimentary units and typically break into fairly small clasts upon weathering (∼b 0.25 m).…”

Section: Lithologic Influences On Rock Glacier Distributionmentioning

confidence: 99%

“…Lithology in the northern half of the range includes Eocene intrusive rocks, Ordovician quartzite, and Mesoproterozoic metasedimentary rocks. The geology of the southern half of the range is less variable and consists of upper Paleozoic carbonate rocks (Ruppel and Lopez, 1988).…”

Section: Regional Setting and Terminologymentioning

confidence: 99%

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The effect of topography, latitude, and lithology on rock glacier distribution in the Lemhi Range, central Idaho, USA

2007

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Section: Methodsmentioning

confidence: 99%

Section: Lithologic Influences On Rock Glacier Distributionmentioning

confidence: 99%

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The effect of topography, latitude, and lithology on rock glacier distribution in the Lemhi Range, central Idaho, USA

2007

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“…It also contains Cretaceous or Eocene Zn-Pb-Ag ± Au ± Ba replacement and vein deposits (Hall, 1985;Hobbs, 1985;Burton and Link, 1995;Mahoney, 1995;Turner and Otto, 1995;Winkler et al, 1995), and some of the associated host structures and fl uid pathways are inferred to have originated during Late Devonian-Early Mississippian Antler-age deformation (Turner andOtto, 1988, 1995). In east-central Idaho, a parallel, northweststriking belt of Devonian-Mississippian continental shelf carbonate rocks hosts Zn-Pb-Ag mineralization in MVT deposits that may be Cretaceous or Eocene (Skipp et al, 1983;Hobbs, 1985) as well as in similar age replacement and vein deposits (Albers, 1983;Skipp et al, 1983;Hobbs, 1985;Ruppel and Lopez, 1988).…”

Section: Eastern Washington-eastern Idahomentioning

confidence: 96%

“…Similar age and composition igneous rocks to the north and northeast of the trend of the miogeocline are mostly barren. The pluton-related and volcanichosted deposit types in the trend of the miogeocline include polymetallic vein ± W; replacement Pb-Ag ± Ba; distal disseminated Au; and epithermal Au, Hg, and Sb deposits (Kiilsgaard et al, 1986;Ruppel and Lopez, 1988;Klein, 2004). Northwest-striking linear aeromagnetic anomalies [North America Magnetic Anomaly Group (NAMAG), 2002] correlate with several of the northwest-striking central Idaho mineral belts.…”

Section: Eastern Washington-eastern Idahomentioning

confidence: 98%

Geometry of the Neoproterozoic and Paleozoic rift margin of western Laurentia: Implications for mineral deposit settings

2008

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The U.S. and Canadian Cordilleran miogeocline evolved during several phases of Cryogenian-Devonian intracontinental rifting that formed the western margin of Laurentia. Recent fi eld and dating studies across central Idaho and northern Nevada result in identifi cation of two segments of the rift margin. Resulting interpretations of rift geometry in the northern U.S. Cordillera are compatible with interpretations of northweststriking asymmetric extensional segments subdivided by northeast-striking transform and transfer segments. The new interpretation permits integration of miogeoclinal segments along the length of the western North American Cordillera. For the U.S. Cordillera, miogeoclinal segments include the St. Mary-Moyie transform, eastern Washingtoneastern Idaho upper-plate margin, Snake River transfer, Nevada-Utah lower-plate margin, and Mina transfer. The rift is orthogonal to most older basement domains, but the location of the transform-transfer zones suggests control of them by basement domain boundaries. The zigzag geometry of reentrants and promontories along the rift is paralleled by salients and recesses in younger thrust belts and by segmentation of younger extensional domains. Likewise, transform-transfer zones localized subsequent transcurrent structures and igneous activity. Sediment-hosted mineral deposits trace the same zigzag geometry along the margin. Sedimentary exhalative (sedex) Zn-Pb-Ag ± Au and barite mineral deposits formed in continental-slope rocks during the Late Devonian-Mississippian and to a lesser degree, during the Cambrian-Early Ordovician. Such deposits formed during episodes of renewed extension along miogeoclinal segments. Carbonate-hosted Mississippi Valleytype (MVT) Zn-Pb deposits formed in structurally reactivated continental shelf rocks during the Late Devonian-Mississippian and Mesozoic due to reactivation of preexisting structures. The distribution and abundance of sedex and MVT deposits are controlled by the polarity and kinematics of the rift segment. Locally, discrete mineral belts parallel secondary structures such as rotated crustal blocks at depth that produced sedimentary subbasins and conduits for hydrothermal fl uids. Where the miogeocline was overprinted by Mesozoic and Cenozoic deformation and magmatism, igneous rock-related mineral deposits are common.

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Metallogenesis

Burt

1991

Reviews of Geophysics

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Regional geology and mineral deposits in and near the central part of the Lemhi Range, Lemhi County, Idaho

Cited by 17 publications

References 0 publications

The effect of topography, latitude, and lithology on rock glacier distribution in the Lemhi Range, central Idaho, USA

The effect of topography, latitude, and lithology on rock glacier distribution in the Lemhi Range, central Idaho, USA

Geometry of the Neoproterozoic and Paleozoic rift margin of western Laurentia: Implications for mineral deposit settings

Metallogenesis

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