Preliminary geologic map of the Monroe quadrangle, Sevier County, Utah

Callaghan, Eugene; Parker, Raymond Laurence

doi:10.3133/ofr5819

Cited by 3 publications

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“…The sequence of rocks overlying the Bullion Canyon Volcanics of Callaghan (1939) was rearranged somewhat by Callaghan and Parker (1961a, 1961b, 1962a, 1962b and Willard and Callaghan (1962) to include the Roger Park Basaltic Breccia to the south, and a younger unit of thick widespread latite flows they called Dry Hollow Formation, both interpreted by them to be Pliocene(?) in age.…”

Section: Previous Stratigraphymentioning

confidence: 99%

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Revised stratigraphy and radiometric ages of volcanic rocks and mineral deposits in the Marysvale area, west-central Utah

Steven¹,

Cunningham²,

Naeser³

et al. 1977

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The Marysvale area, Utah, is near the northeastern end of a broad belt of Tertiary igneous rocks that extends east-northeastward from southern Nevada to central Utah. In late Oligocene and early Miocene time (30-21 m.y.) a composite volcanic center consisting of numerous local volcanoes was active in the general Marysvale area. The volcanoes consisted ot near-source lava flows, volcanic breccias, and minor pyroclastic deposits of generally intermediate composition flanked by coalescing aprons of volcaniclastic debris. Locally derived ash-flow tuffs form important marker beds within the assemblage. Concurrently with local volcanism, ash flows from distant sources in the Great Basin extended into the Marysvale area to interleave marginally with locally derived volcanic rocks.Local volcanic activity in the Marysvale area probably began about 30 m.y. ago with eruption ot mafic intermediate-composition lava flows and volcanic breccias. About 29 m.y. ago, a widespread sheet of crystal-rich ash-flow tuff (Oligocene Needles Range Formation) was spread across the region from distant as yet unidentified centers to the west or southwest. The Needles Pange Formation is exposed all around the Marysvale area, but may have been excluded in places within it by local volcanoes. Accumulation of intermediate-composition volcanic rocks from local centers continued after deposition of the Needles Range Formation, and by 21 m.y. ago, a major pile ot volcanic rocks had been built in the Marysvale area. The name Bullion Canyon Volcanics is applied to this assemblage of Oligocene and Miocene volcanic rocks. » Between 27 and 26 m.y. ago a sequence of distinctive crystal-rich ash tlows was erupted from a center in the northern part of the Marysvale pile, and a small trap-door type block subsided at the source. The resulting ash tlow tuft sheet, here named Three Creeks Tuff Member of the Bullion Canyon Volcanics, made up a significant part of what was formerly considered part ot the Dry Hollow Formation. The Dry Hollow previously was believed to be younger than the Bullion Canyon Volcanics. However, we have found the Three Creeks Tuff Member in Bullion Canyon, the type locality of the Bullion Canyon Volcanics, thereby demonstrating the lateral equivalence ot the Dry Hollow and part of the Bullion Canyon. We abandon the name Dry Hollow Formation.Bullion Canyon rocks overlying the Three Creeks Tuff Member consist ot a poorly understood assemblage that includes a basaltic andesite shield volcano, ash-flow tuffs of diverse lithologies and sources, and intermediate-composition lava flows and volcanic breccia. The Delano Peak Tuft Member (formerly the Delano Peak Latite Member) is one ot the more distinctive of the ash-flow units in the upper part.Between 21 and 17 m.y. ago, repeated rhyolitic eruptions from two source areas in the Marysvale area produced a heterogeneous assemblage 1 ot ash-flow tufts, lava flows and domes, and associated pyroclastic and mudflow breccias, and emplaced local rhyolite and granite intrusive bodies. Two cauldrons, th...

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Section: Previous Stratigraphymentioning

confidence: 99%

“…Along the eastern side of the Pavant Range the assemblage ot lava tlows and tufts typical ot the Clear Creek area intertongue laterally with a sequence of mafic lava flows that Callaghan and Parker (1961a;1962b) called the basaltic andesite flows ot the Dry Hollow Formation.…”

Section: The Dry Hollow Formation Problemmentioning

confidence: 99%

Revised stratigraphy and radiometric ages of volcanic rocks and mineral deposits in the Marysvale area, west-central Utah

Steven¹,

Cunningham²,

Naeser³

et al. 1977

Open-File Report

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“…Several monzonitic to quartz monzonitic intrusive bodies cut the vent-facies volcanic rocks (Kerr and others, 1957, pi. 12;Callaghan and Parker, 1961a;Willard and Callaghan, 1962); the largest of these are in the southern Antelope Range, where two plutons, 1-3 and 3-4 km across, are widely exposed. Smaller bodies of fine-grained granite cut the larger of the quartz monzonitic plutons (referred to locally as the "central intrusive") in the vicinity of the main uranium-producing area (central mining area of Kerr and others, 1957).…”

Section: Volcanic Centers and Intrusive Rocks Of The Marysvale Canyon...mentioning

confidence: 99%

“…With minor exceptions, the assemblage consists of highly silicic, phenocryst-poor alkali rhyolite. The heterogeneous rocks that accumulated near their source in the central Tushar Mountains and Antelope Range were called Mount Belknap Rhyolite by Callaghan (1939), Callaghan and Parker (1961a;1961b;1962a, 1962b, and Willard and Callaghan (1962), and the "Mount Belknap volcanic series" by Kerr and others (1957, p. 24). Generally less welded outflow tuffs belonging to the same assemblage were interpreted to be younger than the Mount Belknap and were called Joe Lott Tuff by these workers.…”

Section: Mount Belknap Volcanicsmentioning

confidence: 99%

Revised stratigraphy and radiometric ages of volcanic rocks and mineral deposits in the Marysvale area, west-central Utah

Steven¹,

Cunningham²,

Naeser³

et al. 1979

View full text Add to dashboard Cite

The Marysvale area, Utah, is near the northeast end of a broad belt of Tertiary igneous rocks that extends east-northeastward from southern Nevada to central Utah. In late Oligocene and early Miocene time (30-21 m.y. (million years) ago), a composite volcanic center consisting of numerous local volcanoes was active in the general Marysvale area. The volcanoes consisted of near-source lava flows, volcanic breccias, and minor pyroclastic deposits of generally intermediate composition flanked by coalescing aprons of volcaniclastic debris. Locally derived ash-flow tuffs form important marker beds within the assemblage. Concurrently with local volcanism, ash flows from distant sources in the Great Basin extended into the Marysvale area to interleave marginally with locally derived volcanic rocks.Local volcanic activity in the Marysvale area probably began about 30 m.y. ago with eruption of mafic intermediate-composition lava flows and volcanic breccias. About 29 m.y. ago, a widespread sheet of crystal-rich ash-flow tuff (Oligocene Needles Range Formation) was spread across the region from distant, as yet unidentified centers to the west or southwest. The Needles Range Formation is exposed all around the Marysvale area, but may have been excluded in places within it by local volcanoes. Accumulation of intermediate-composition volcanic rocks from local centers continued after deposition of the Needles Range Formation, and by 21 m.y. ago, a major pile of volcanic rocks had been built in the Marysvale area. The name Bullion Canyon Volcanics is applied to this assemblage of Oligocene and Miocene volcanic rocks.About 27 m.y. ago a sequence of distinctive crystal-rich ash flows was erupted from a center in the northern part of the Marysvale pile, and a small trapdoor type block subsided at the source. The resulting ash flow tuff sheet, here named Three Creeks Tuff Member of the Bullion Canyon Volcanics, made up a significant part of what was formerly considered part of the Dry Hollow Formation. The Dry Hollow previously was believed to be younger than the Bullion Canyon Volcanics. However, we have found the Three Creeks Tuff Member in Bullion Canyon, in the type locality of the Bullion Canyon Volcanics, thereby demonstrating the lateral equivalence of the Dry Hollow and part of the Bullion Canyon. We abandon the name Dry Hollow Formation.Bullion Canyon rocks overlying the Three Creeks Tuff Member consist of a poorly understood assemblage that includes a basaltic andesite shield volcano, ash-flow tuffs of diverse lithologies and sources, and intermediate-composition lava flows and volcanic breccia. The Delano Peak Tuff Member (formerly the Delano Peak Latite Member) is one of the more distinctive of the ash-flow units in the upper part.Between 21 and 18 m.y. ago, repeated rhyolitic eruptions from two source areas in the Marysvale area produced a heterogeneous assemblage of ash-flow tuffs, lava flows 'Thicknesses from Callaghan (1939) are given in the units used in the original report (1 foot=0.3 m.).

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“…Molloy and Kerr (1962) strip along Beaver Creek between Gold Mountain and the Antelope Range. Callaghan and coworkers from the U.S. Geological Survey mapped the geology of four 15-minute quadrangles (Callaghan and Parker, 1961a, 1962a, 1962bWillard and Callaghan, 1962), and the contiguous eastern part of another (Callaghan and Parker, 1961b). Callaghan (1973) assessed the mineral resource potential ofPiute County, and in that report he made first mention of the Mount Belknap caldera (p. 14) and recognized that the red Mount Belknap Rhyolite was a welded tuff erupted from the vicinity of Mount Belknap.…”

Section: Introductionmentioning

confidence: 99%

Mount Belknap and Red Hills calderas and associated rocks, Marysvale volcanic field, west-central Utah

Cunningham¹,

Steven²

1979

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Preliminary geologic map of the Monroe quadrangle, Sevier County, Utah

Cited by 3 publications

References 0 publications

Revised stratigraphy and radiometric ages of volcanic rocks and mineral deposits in the Marysvale area, west-central Utah

Revised stratigraphy and radiometric ages of volcanic rocks and mineral deposits in the Marysvale area, west-central Utah

Revised stratigraphy and radiometric ages of volcanic rocks and mineral deposits in the Marysvale area, west-central Utah

Mount Belknap and Red Hills calderas and associated rocks, Marysvale volcanic field, west-central Utah

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