White Horse alunite deposit, Marysvale, Utah

Willard, Max E.; Proctor, Paul Dean

doi:10.2113/gsecongeo.41.6.619

Cited by 6 publications

(8 citation statements)

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“…The spectra can be grouped according to alteration zone type. Spectra 2-4, 11, and 13 represent the sulfidized, propylitic feeder zone; spectra 1, 5, 6, and 12 represent quartz-and dickite-rich, fracture-controlled alteration surrounding the advanced argillic core zones; spectrum 7 represents the alunite-kaolinite transition zone; spectra 8 and 9 represent the core zones of alunite; and spectrum 10 represents the "broken clay zone" first recognized by Willard and Proctor (1946), a narrow, highly fractured and friable zone, rich in kaolinite and illite, that lies at the boundary between the alunite-kaolinite transition zone and the surrounding propylitically altered rocks. General agreement of the laboratory and AVIRIS spectra is evident, with some notable exceptions attributable to the large difference in the field of view of the spectrometers.…”

Section: Verification Of Remote Sensing Resultsmentioning

confidence: 99%

“…Subsequently, the alunite deposits were buried under sands and gravels of the Sevier River Formation and have only recently been exhumed. Willard and Proctor (1946) recognized that the host rocks for the alunite dip to the southwest, and that numerous isoclinal flow folds are superimposed upon this simple general structure in the vicinity of the White Horse mine. These flow folds strike north to north-northwest, are slightly overturned to the west, and plunge a few degrees south.…”

Section: Geologic Setting and Previous Workmentioning

confidence: 99%

“…Image center point: 38º 31' 26" N, 112º 13' 06" W. alunitic rock are elongated parallel to the axial planes of the flow folds. Willard and Proctor (1946) proposed that an infolded, highly porous upper layer of the flow served as a conduit for the introduction of hydrothermal fluids. They also observed that envelopes of kaolinite surround the central zones of alunite.…”

Section: Geologic Setting and Previous Workmentioning

confidence: 99%

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Spectroscopic Mapping of the White Horse Alunite Deposit, Marysvale Volcanic Field, Utah: Evidence of a Magmatic Component

Rockwell¹,

Cunningham²,

Breit³

et al. 2006

Economic Geology

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Previous studies have demonstrated that the replacement alunite deposits just north of the town of Marysvale, Utah, USA, were formed primarily by low-temperature (100º-170º C), steam-heated processes near the early Miocene paleoground surface, immediately above convecting hydrothermal plumes. Pyrite-bearing propylitically altered rocks occur mainly beneath the steam-heated alunite and represent the sulfidized feeder zone of the H2S-dominated hydrothermal fluids, the oxidation of which at higher levels led to the formation of the alunite. Maps of surface mineralogy at the White Horse deposit generated from Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data were used in conjunction with X-ray diffraction studies of field samples to test the accuracy and precision of AVIRIS-based mineral mapping of altered rocks and demonstrate the utility of spectroscopic mapping for ore deposit characterization. The mineral maps identified multiple core zones of alunite that grade laterally outward to kaolinite. Surrounding the core zones are dominantly propylitically altered rocks containing illite, montmorillonite, and chlorite, with minor pyrite, kaolinite, gypsum, and remnant potassium feldspar from the parent rhyodacitic ash-flow tuff. The AVIRIS mapping also identified fracture zones expressed by ridge-forming selvages of quartz + dickite + kaolinite that form a crude ring around the advanced argillic core zones. Laboratory analyses identified the aluminum phosphate-sulfate (APS) minerals woodhouseite and svanbergite in one sample from these dickite-bearing argillic selvages. Reflectance spectroscopy determined that the outer edges of the selvages contain more dickite than do the medial regions. The quartz + dickite ± kaolinite ± APS-mineral selvages demonstrate that fracture control of replacement processes is more prevalent away from the advanced argillic core zones. Although not exposed at the White Horse deposit, pyrophyllite ± ordered illite was identified using AVIRIS in localized, superimposed conduits within propylitically altered rocks in nearby alteration systems of similar age and genesis that have been eroded to deeper levels. The fracture zones bearing pyrophyllite, illite, dickite, natroalunite, and/or APS minerals indicate a magmatic component in the dominantly steam-heated system.

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Section: Verification Of Remote Sensing Resultsmentioning

confidence: 99%

Section: Geologic Setting and Previous Workmentioning

confidence: 99%

Section: Geologic Setting and Previous Workmentioning

confidence: 99%

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Spectroscopic Mapping of the White Horse Alunite Deposit, Marysvale Volcanic Field, Utah: Evidence of a Magmatic Component

Rockwell¹,

Cunningham²,

Breit³

et al. 2006

Economic Geology

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show abstract

“…Callaghan (1938Callaghan ( , 1939 published the first comprehensive studies of the igneous rocks and alunite deposits of the area and set up the volcanic stratigraphy. During World War II, the alunite deposits of the area were investigated and explored by the U.S. Bureau of Mines and U.S. Geological Survey; partial results of this work were published by Hild (1946) and Willard and Proctor (1946). The discovery of uranium in the Antelope Range in 1949led to a period of intense study of the area by Paul Kerr and his students P.M. Bethke, G. P. Brophy, H. M. Dahl, Jack Green, L. E. Woolard, and N. W Molloy, of Columbia University, under the auspices of the U.S. Atomic Energy Commission.…”

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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“…Callaghan (1938Callaghan ( , 1939 published the first comprehensive studies of the igneous rocks and alunite deposits of the area and set up the volcanic stratigraphy. During World War II, the alunite deposits of the area were investigated and explored by the U.S. Bureau of Mines and U.S. Geological Survey; partial results of this work were published by Hild (1946) and Willard and Proctor (1946). The discovery of uranium in the Antelope Range in 1962), and the contiguous eastern part of another (Callaghan and Parker, 1961b).…”

Section: Introductionmentioning

confidence: 99%

White Horse alunite deposit, Marysvale, Utah

Cited by 6 publications

References 0 publications

Spectroscopic Mapping of the White Horse Alunite Deposit, Marysvale Volcanic Field, Utah: Evidence of a Magmatic Component

Spectroscopic Mapping of the White Horse Alunite Deposit, Marysvale Volcanic Field, Utah: Evidence of a Magmatic Component

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

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

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