Geologic map of the Steamboat Mountain and Bible Spring quadrangles, western Iron County, Utah

Best, Myron G.; Davis, Robert L.

doi:10.3133/ofr811213

Cited by 3 publications

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“…The Steamboat Mountain Formation near the southwest corner of the Richfield quadrangle, like the adjoining older Blawn Formation, consists of both silicic and mafic volcanic rocks (Best and Davis, 1981). The silicic rocks are mostly rhyolite lava flows, with lesser associated ash-flow and airfall tuff and water-reworked tuff, distributed over an area more than 20 km across.…”

Section: Bimodal Igneous Rocks Of Miocene Agementioning

confidence: 99%

“…The altered areas range from small patches a few meters in diameter, to large areas as much as 7 km across. Some of the altered areas are closely localized along the northeast-trending Bible Spring fault zone (Best and Davis, 1981), or along its trend northeastward where it projects directly toward the Katie (Cima) sulfur-mercury deposit; other altered areas are more randomly scattered or are associated with local igneous centers of Steamboat Mountain age.…”

Section: [Resource Potential High]mentioning

confidence: 99%

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Mineral resource potential of the Richfield 1° x 2° quadrangle, west-central Utah

Steven¹,

Morris²

1984

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The geology of the Richfield quadrangle is highly varied and developed over a long span of time. The oldest rocks comprise small patches of early Proterozoic gneiss and schist that crop out along the west side of the Mineral Mountains. Sedimentation during the latest Precambrian, Paleozoic, and Mesozoic deposited a thick sequence of sedimentary rocks now exposed in the northern part of the quadrangle. These rocks were broadly deformed during the Sevier orogeny in late Cretaceous time when allochthonous Precambrian and Paleozoic rocks were thrust eastward across Mesozoic and Paleozoic strata in the autochthon along the sinuous Sevier orogenic belt that trends diagonally southwest across the quadrangle. In early Tertiary time, erosion of highlands west of the orogenic belt produced a wide variety of debris that accumulated in basins east of the highland. Volcanism in Oligocene and early Miocene time formed an east-northeast-trending belt of calc-alkalic volcanoes across the southern half of the quadrangle; these rocks range in composition from mafic andesite to low-silica rhyolite. In early Miocene, about coincident with inception of extensional tectonism throughout much of the Western U.S., the composition of volcanic rocks changed to a bimodal assemblage of mafic rocks and high-silica alkali rhyolite that erupted episodically throughout the remainder of Cenozoic time. Extensional tectonism culminated in late Miocene-Pliocene time when the present basin-range topography formed through block faulting. The resulting mountain areas were eroded rapidly to supply debris which was deposited in the lower parts of nearby basins. Known and inferred mineral resources in the Richfield quadrangle are both syngenetic and epigenetic. Syngenetic types include limestone and dolomite, silica-rich sandstone and quartzite, metalliferous black shale, evaporite deposits, zeolite deposits, pumice, cinders and scoria, perilte, and different materials deposited in playa environments. The carbonate and silica resources are virtually inexhaustible, but are generally unfavorably located with respect to markets. The other syngenetic resources need to be discovered, or to have extraction or fabrication technologies developed to utilize them. Epigenetic resources are largely of volcanogenic-hydrothermal origin. Mineralization took place many times and in many different places, and deposits can be grouped by geologic association. The earliest mineralization was related to calc-alkalic igneous centers of Oligocene age, which formed an east-northeast-trending belt across the full length of the quadrangle. Associated resources are predominantly base-and precious-metal deposits (Cu, Pb, Zn, Au, and Ag) that occur in a wide variety of types zoned around core intrusions. During Miocene and younger times, many local rhyolite fields developed along the axis of the older belt of calc-alkalic centers. Resources or possible resources of lithophile elements (Mo, W, U, Be, Sn, and F) as well as base and precious metals (Pb, Zn, Au, and Ag) occur in associat...

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Section: Bimodal Igneous Rocks Of Miocene Agementioning

confidence: 99%

Section: [Resource Potential High]mentioning

confidence: 99%

Mineral resource potential of the Richfield 1° x 2° quadrangle, west-central Utah

Steven¹,

Morris²

1984

Open-File Report

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“…The mafic lava flows are minor in extent in the southern Wah Wah Mountains (Best and others, 1987), whereas the rhyolite lava flows are extensive in both the Wah Wah Mountains and the southern Indian Peak range (fig. 2): they reach the greatest thickness of 500 m at Steamboat Mountain (Best and Davis, 1981;Best and others, 1987).…”

Section: Steamboat Mountain Formationmentioning

confidence: 91%

“…A geologic map of the Mountain Spring Peak quadrangle was published at a scale of 1:24,000 by Best (1979); one of the Bible Spring quadrangle, to the west, was published by Best and Davis (1981); and the Teton quadrangle, to the north, was mapped by Best and Keith (1979). These maps at a scale of 1:24,000 and the accompanying descriptions of Oligocene and Miocene volcanic rocks in the area provided an excellent background for more detailed work.…”

Section: Previous Workmentioning

confidence: 99%

Geology and geochemistry of the Broken Ridge area, southern Wah Wah Mountains, Iron County, Utah

Duttweiler¹,

Griffitts²

1989

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Contents Ill 24 17. Distribution of Ba and Pb in rocks 24 18. Map showing heavy-mineral-concentrate sample localities with simplified geology 25 19. Map showing distribution of Sn and cassiterite in heavy-mineral concentrates 26 20. Photomicrographs of cassiterite and hematite in vein in silicified rhyolite 28 21. Schematic diagram showing relationship between rhyolite tuffs and lava flows in Broken Ridge area, and possible related mineral deposits 29 Contents V

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“…Rhyolitic rocks with ages of 12-13 m.y. occur elsewhere in southwestern Utah, including the topaz rhyolite of the Steamboat Mountain Formation (Best, 1981). The K-Ar age of the rhyolite of Pinon Point is 12.8 ± 0.6 m.y.…”

Section: Rhyolite Of Pinon Pointmentioning

confidence: 98%

Geologic map of the Pinon Point Quadrangle, Iron County, Utah

1985

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Mapping of the Pinon Point quadrangle reveals that the area is dominated by volcanic rocks of Oligocene through Miocene age. Previously unmapped and undescribed volcanic units have been studied and defined in order to provide a geologic base map upon which future studies can expand. Field mapping was supplemented by aerial photography, and descriptions of the volcanic rocks include petrographic and geochemical data, as well as observational data from the field. Results of the study define the occurrence of both calc-alkaline and bimodal (basalt plus rhyolite) magmatism within the quadrangle. A thick sequence of volcaniclastic rocks, which host silver mineralization in the adjacent Beryl Junction quadrangle, are poorly exposed and bounded by faults in the east-central portion of the Pinon Point quadrangle. The surficial geology within the quadrangle lacks evidence of extensive hydrothermal alteration and no geochemical anomalies have yet been documented. Although data are scarce, at the present time no geothermal prospects or anomalies are known to occur in the quadrangle.

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Geologic map of the Steamboat Mountain and Bible Spring quadrangles, western Iron County, Utah

Abstract: IIUUTlUft or n l IftUlOl ~ IllLI SPIll~ qU.DJAa~LIS.

Cited by 3 publications

References 0 publications

Mineral resource potential of the Richfield 1° x 2° quadrangle, west-central Utah

Mineral resource potential of the Richfield 1° x 2° quadrangle, west-central Utah

Geology and geochemistry of the Broken Ridge area, southern Wah Wah Mountains, Iron County, Utah

Geologic map of the Pinon Point Quadrangle, Iron County, Utah

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