Mapping of hydrothermally altered rocks using airborne multispectral scanner data, Marysvale, Utah, mining district

Podwysocki, M. H.; Segal, Donald B.; Jones, O.D.

doi:10.1016/0273-1177(83)90109-6

Cited by 5 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A previous multispectral remote sensing study of the Antelope Range used five channels of the Bendix 24-channel airborne scanner developed for NASA (Podwysocki and Segal, 1983). That study identified areas of Fe-and/or Al-OH-bearing hydrothermally altered rocks and diagenetically altered ash-fall tuffs containing zeolites.…”

Section: Geologic Setting and Previous Workmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

Section: Geologic Setting and Previous Workmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…One of the intracaldera plutons that is distinctive enough to be mapped separately is the Central Intrusion. Several geologists have studied the effects of sub-circular hydrothermal ground-water convection cells caused by and surrounding that intrusion (Podwysocki and Segal, 1983;Cunningham and others, 1994;Rockwell and others, 2002). Alunite formed in a near-surface environment from hydrothermal cells that reacted with evaporite-bearing strata at depth to supply sedimentary sulfur.…”

Section: Economic Geologymentioning

confidence: 99%

“…The caldera wall, however, passes through the eastern side of Sage Flat, then north. The red peak at 12:00 is made up of Monroe Peak intracaldera volcanic rocks that have been altered by one of the hydrothermal convection cells surrounding the Central Intrusion (Podwysocki and Segal, 1983). In these cells, a lower alunite zone passes upward into jarosite, hematite, and flooded silica zones (Cunningham and others, 1984a).…”

Section: 7mentioning

confidence: 99%

Field guide to geologic excursions in southwestern Utah and adjacent areas of Arizona and Nevada

Lund¹

2002

Open-File Report

View full text Add to dashboard Cite

“…The intrusion is ringed by spectacularly well exposed areas of hydrothermally altered country rocks and hot-spring quartz masses, interpreted to be the tops of a series of hydrothermal convection cells of circulating ground water (Podwysocki and Segal, 1983;Cunningham, Rye, and others, 1984 ). The Central intrusion has been abundantly dated by various isotopic methods, although some previous isotopic determinations did not give it a satisfactory age (summarized in Rowley and others, 1988a, b).…”

Section: Calc-alkaline Intrusionsmentioning

confidence: 99%

“…Calderas within the volcanic field were discussed by Cunningham and Steven (1979a), Steven (1981), Steven, Rowley, and Cunningham (1984), Steven, Cunningham, and Anderson (1984 ), and Budding and others (1987). Reports of specific mineral deposits, including their isotopic ages, are given by Cunningham and Steven ( 1979b, c), Steven and others (1981), Cunningham and others (1982), Cunningham, Rye, and others (1984), Cunningham, Steven, Campbell, and others (1984), Podwysocki and Segal (1983), Beaty and others (1986), and Steven and Morris (1987). In 1990, Steven and others published a 1 :250,000-scale geologic map showing most of the Marysvale field and much of the rest of the Pioche-Marysvale igneous belt.…”

Section: Introductionmentioning

confidence: 99%

Isotopic ages and stratigraphy of Cenozoic rocks of the Marysvale volcanic field and adjacent areas, west-central Utah

Rowley¹,

Mehnert²,

Naeser³

et al. 1994

View full text Add to dashboard Cite

Mapping of hydrothermally altered rocks using airborne multispectral scanner data, Marysvale, Utah, mining district

Cited by 5 publications

References 6 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

Field guide to geologic excursions in southwestern Utah and adjacent areas of Arizona and Nevada

Isotopic ages and stratigraphy of Cenozoic rocks of the Marysvale volcanic field and adjacent areas, west-central Utah

Contact Info

Product

Resources

About