Quaternary volcanism in the Salton Sea geothermal field, Imperial Valley, California

Robinson, Paul T.; Elders, W. A.; Muffler, L. J. Patrick

doi:10.1130/0016-7606(1976)87<347:qvitss>2.0.co;2

Cited by 83 publications

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“…1 of McDowell and Paces, 1985). Rhyolitic and basaltic volcanic material (Robinson et al, 1976) has been observed in a number of wells, presumably in the form of thin intrusive bodies, and the Elmore 1 well bottomed in a rhyolitic unit that produced local contact metamorphic effects in sandstone. Both the volcanic and contact metamorphic rocks have been altered to mineral assemblages compatible with those observed in adjacent geothermally altered sandstone.…”

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confidence: 99%

Composition and structural state of coexisting feldspars, Salton Sea geothermal field

McDowell

1986

Mineral. mag.

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ABSTRACT. Active metamorphism of fine grained sandstone in the c.16000 year old Salton Sea geothermal system has produced a suite of chemically equilibrated coexisting authigenic alkali feldspars and re-equilibrated detrital feldspars in the 250-360 ~ temperature range. At e.335 ~ the average compositions, 2 Vs, and (txo +tim) and Z ordering parameters of coexisting authigenic feldspars are [Or0.s2Ab97.40An2.08, 2V x = 91.3___4.8,

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confidence: 99%

Composition and structural state of coexisting feldspars, Salton Sea geothermal field

McDowell

1986

Mineral. mag.

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“…Hydrothermal alteration has also been observed in small rhyolitic and basaltic intrusions penetrated during drilling at the Salton Sea (Robinson et al, 1976) and…”

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confidence: 95%

“…Robinson et al (1976) assume that the rhyolite domes and subsurface silicic rocks formed from the same lava and that the present composition differences result from intense hydrothermal -61-a l t e r a t i o n of t h e l a t t e r .…”

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confidence: 99%

“…The chemistry of the alteration assemblages in the Salton Sea field has been the object of several investigations over the past 15 years (Helgeson, 1967(Helgeson, , 1968bSkinner, et al 1967;White, 1968, 1969;Keith et al, 1968;Kendall, 1976;Robinson, et al, 1976; Elders e t Elders, 1978;Tewhey, 1977;McDowell and McCurry, 1977;Elders, 1978, 1979). These studies, based largely on cuttings from several drill holes and to a lesser extent on drill cores, represent a major contribution to the understanding of hydrothermal alteration processes in the continental crust.…”

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confidence: 99%

“…A relatively comprehensive set of chemical data has been published for the rhyolitic volcanics and the subsurface silicic rocks of the Salton Sea geothermal field (Robinson, et al 1976). …”

Section: Va 2 Elemental Geochemistrymentioning

confidence: 99%

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Comparative assessment of five potential sites for hydrothermal magma systems: geochemistry

White¹,

Baldridge²,

Gerlach³

et al. 1980

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EpisodicHolocene eruption of theSaltonButtes rhyolites,California, from paleomagnetic,U‐Th, andAr/Ar dating

Wright

Vazquez

Champion

et al. 2015

Geochem Geophys Geosyst

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In the Salton Trough, CA, five rhyolite domes form the Salton Buttes: Mullet Island, Obsidian Butte, Rock Hill, North and South Red Hill, from oldest to youngest. Results presented here include 40Ar/39Ar anorthoclase ages, 238U‐230Th zircon crystallization ages, and comparison of remanent paleomagnetic directions with the secular variation curve, which indicate that all domes are Holocene. 238U‐230Th zircon crystallization ages are more precise than but within uncertainty of 40Ar/39Ar anorthoclase ages, suggesting that zircon crystallization proceeded until shortly before eruption in all cases except one. Remanent paleomagnetic directions require three eruption periods: (1) Mullet Island, (2) Obsidian Butte, and (3) Rock Hill, North Red Hill, and South Red Hill. Borehole cuttings logs document up to two shallow tephra layers. North and South Red Hills likely erupted within 100 years of each other, with a combined 238U‐230Th zircon isochron age of: 2.83 ± 0.60 ka (2 sigma); paleomagnetic evidence suggests this age predates eruption by hundreds of years (1800 cal BP). Rock Hill erupted closely in time to these eruptions. The Obsidian Butte 238U‐230Th isochron age (2.86 ± 0.96 ka) is nearly identical to the combined Red Hill age, but its Virtual Geomagnetic Pole position suggests a slightly older age. The age of aphyric Mullet Island dome is the least well constrained: zircon crystals are resorbed and the paleomagnetic direction is most distinct; possible Mullet Island ages include ca. 2300, 5900, 6900, and 7700 cal BP. Our results constrain the duration of Salton Buttes volcanism to between ca. 5900 and 500 years.

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Quaternary volcanism in the Salton Sea geothermal field, Imperial Valley, California

Cited by 83 publications

References 0 publications

Composition and structural state of coexisting feldspars, Salton Sea geothermal field

Composition and structural state of coexisting feldspars, Salton Sea geothermal field

Comparative assessment of five potential sites for hydrothermal magma systems: geochemistry

EpisodicHolocene eruption of theSaltonButtes rhyolites,California, from paleomagnetic,U‐Th, andAr/Ar dating

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