Magmatic, structural, and hydrothermal evolution of the Mineral Mountains intrusive complex, Utah

Nielson, Dennis L.; Evans, Stanley H.; Sibbett, B.S.

doi:10.1130/0016-7606(1986)97<765:msaheo>2.0.co;2

Cited by 26 publications

(44 citation statements)

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“…23. Reported K-Ar ages for the rhyolite porphyry dikes (12) agree well with those for the Gillies Hill rhyolite (19). However, K-Ar dates for intrusive rocks from the Mineral Mountains are consistently younger than U-Pb dates for the same phases (7,13), and therefore probably represent cooling ages.…”

supporting

confidence: 61%

Turbulent Mixing Under Drifting Pack Ice in the Weddell Sea

McPhee

Martinson

1994

Science

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By providing cold, dense water that sinks and mixes to fill the abyssal world ocean, high-latitude air-sea-ice interaction is the main conduit through which the deep ocean communicates with the rest of the climate system. A key element in modeling and predicting oceanic impact on climate is understanding the processes that control the near surface exchange of heat, salt, and momentum. In 1992, the United States-Russian Ice Station Weddell-1 traversed the western Weddell Sea during the onset of winter, providing a platform for direct measurement of turbulent heat flux and Reynolds stress in the upper ocean. Data from a storm early in the drift indicated (i) well-formed Ekman spirals (in both velocity and turbulent stress); (ii) high correlation between mixed layer heat flux and temperature gradients; (iii) that eddy viscosity and eddy thermal diffusivity were similar, about 0.02 square meters per second; and (iv) that the significant turbulent length scale (2 to 3 meters through most of the boundary layer) was proportional to the wavelength at the peak in the weighted vertical velocity spectrum. The measurements were consistent with a simple model in which the bulk eddy viscosity in the neutrally buoyant mixed layer is proportional to kinematic boundary stress divided by the Coriolis parameter.

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supporting

confidence: 61%

Turbulent Mixing Under Drifting Pack Ice in the Weddell Sea

McPhee

Martinson

1994

Science

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“…The bulk of the exposed intrusive rocks (>80%) were eraplaced between 18 and 16 Ma [Coleman, 1991 ]. Intrusion of the early phases of the pluton does not appear to be synchronous with substantial extensional deformation; however, the eraplacement of dikes at 9 Ma occurred during a period of significant regional detachment faulting and uplift ofthe range [Nielson et al, 1986]. Hornblende barometry for rocks intruded between 25 and 16 Ma indicate that they all intruded at pressures of 2.0 to 2.5 kbar, consistent with the idea that most uplift occurred after eraplacement of the batholith [Coleman, 1991].…”

supporting

confidence: 55%

“…The Mineral Mountains area has remained magmatically active and was the sight of voluminous Quaternary volcanism [Lipman et al, 1978] and continues to be a geothermal "hot spot." With the exception of minor 8 to 9-Me rhyolite flows [Evans and Stevens, 1982], there are no known extrusive equivalents to the intrusive rocks exposed nite and low-silica granite comprising greater than 80% of the exposed phases [Nielson et al, 1978[Nielson et al, , 1986Sibbett and Nielson, 1980]. Field relations indicate that there is a progression toward intrusion of more silicic phases throughout the history of the batholith [Coleman, 1991].…”

mentioning

confidence: 99%

Evidence for the generation of juvenile granitic crust during continental extension, Mineral Mountains Batholith, Utah

Coleman¹,

Walker²

1992

J. Geophys. Res.

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Field, chemical and isotopic data from the Miocene Mineral Mountains batholith in southwest Utah are consistent with the batholith being derived through differentiation of material recently separated from the lithospheric mantle, with little involvement of pre-Oligocene crust. The batholith ranges in composition and texture from diabase and gabbro to high-silica rhyolite and granite and is distinctly calcalkaline in nature. Field evidence for anatexis of intermediate-composition Oligocene crust and magma mixing suggest that fractional melting and mixing were important processes during the evolution of the batholith. Major oxide and rare earth element data for the batholith are consistent with chemical evolution of the magma system being controlled by fractionation of hornblende, plagioclase and sphene (all of which occur in restitic portions of Miocene migmatites exposed in the field area) during partial melting, and mixing between gabbin and granite. Isotopic data indicate a lithospheric mantle source for mafic rocks in the study area and, on the basis of field data and their similarity in isotopic composition, granitic rocks are interpreted to be derived indirectly from the same source during Basin and Range extension. Evolution of the granites is hypothesized to involve a series of partial melting steps, one of which is exposed in the batholkh, which refine mantle-derived gabbros into high-silica rocks. Thus the Mineral Mountains batholith represents juvenile granitic material added to the crust during extension. This raises the possibility that extension may be an important granitic crust-forming event. Furthermore, this suggests that pure-shear igneous inflation of the crust by the mantle can be an important mechanism during extensional deformation. Data presented here indicate that fractional melting of young mafic crust may be an important process in the evolution of isotopically homogeneous intrusive suites which span a broad compositional range. Furthermore, the data support the idea that lithospheric manfie in the Great Basin region may be Proterozoic in age.

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“…Just north of the Gorge of the Virgin River, the entire clastic sequence becomes a yellow sandstone (Hintze, 1986a). Nielson ( 1986) supported the idea that the Hermit Formation and the Coconino Sandstone came to a depositional edge between Grand Canyon and the Gorge of the Virgin River. Like Hintze (1986b), Nielson chose the name Queantoweap Sandstone for all the sandstone/siltstone beds below the Toroweap Formation because his measured Rice and Loope, 1991Bohannon and others, 1991Bohannon and Lucchitta, 1991Bohannon, 1991 …”

Section: Geologic Studies Barco Study Unit 1995mentioning

confidence: 73%

“…Small volumes of basalt and basaltic andesite erupted from vents scattered in the Basin and Range and transition zone from 16 to 8 Ma (Best and others, 1980;Mattox, 1991b). From 7 to 4 Ma, volcanism was alkaline and volcanic activity was located in the eastern transition zone, the Sevier and Awapa Plateaus (Rowley and others, 1981;Nelson, 1989;Mattox, 1991b). During this period, mafic alkaline dikes intruded the San Rafael Swell in the Colorado Plateau (Gartner, 1985;Gartner and Delaney, 1988).…”

Section: Geologic Setting and Previous Workmentioning

confidence: 99%

Geologic studies in the Basin and Range-Colorado Plateau transition in southeastern Nevada, southwestern Utah, and northwestern Arizona, 1995

Maldonado¹,

Nealey²

1997

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Magmatic, structural, and hydrothermal evolution of the Mineral Mountains intrusive complex, Utah

Cited by 26 publications

References 0 publications

Turbulent Mixing Under Drifting Pack Ice in the Weddell Sea

Turbulent Mixing Under Drifting Pack Ice in the Weddell Sea

Evidence for the generation of juvenile granitic crust during continental extension, Mineral Mountains Batholith, Utah

Geologic studies in the Basin and Range-Colorado Plateau transition in southeastern Nevada, southwestern Utah, and northwestern Arizona, 1995

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