Gravity and thermal models of the twin peaks magma system, West-Central Utah

Conference · Mon Sep 01 04:00:00 EDT 1980 · Trans. - Geotherm. Resour. Counc.; (United States)

OSTI ID:6375277

Carrier, K L ^[1]; Chapman, D S

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1. Union Oil, Santa Rosa, CA

Gravity, heat flow, surface geology, and geochemistry have been integrated to evaluate the geothermal potential of a site of late Tertiary silicic volcanism at Twin Peaks, Utah. Volcanism began in the area with the extrusion of the Coyote Hills rhyolite 2.74+-.1 m.y. ago, and was resumed, after .2 m.y. of quiescence, with the extrusion of a complex sequence of domes and flows that lasted until 2.35+-.07 m.y. ago. Residual gravity in the Twin Peaks area is characterized by a roughly circular and broad 7 mgal gravity low possibly related to a body intruding the basement. The intrusion can be approximated by a three-dimensional vertical cylinder with a roof at the depth of 3 km, a radius about 6 km, and a thickness of 2.25 - 3.5 km. Simple conductive thermal models predict a maximum anomalous heat flow of 175 mW/m/sup 2/ at surface, 90,000 years after emplacement of the intrusion. Model prediction of negligible residual heat flow at the present is consistent with measured heat flow of 96 mW/m/sup 2/ at Twin Peaks, which is indistinguishable from background Basin and Range heat flow.

• OSTI ID: 6375277
• Report Number(s): CONF-800920-
• Conference Information: Journal Name: Trans. - Geotherm. Resour. Counc.; (United States) Journal Volume: 4
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150201 -- Geology & Hydrology of Geothermal Systems-- USA-- (-1989)
150301* -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys
BOREHOLES
CAVITIES
CHEMISTRY
GEOCHEMISTRY
GEOLOGIC MODELS
GEOLOGY
GEOPHYSICAL SURVEYS
GEOTHERMAL RESOURCES
GEOTHERMAL SYSTEMS
GRAVITY SURVEYS
HEAT FLOW
MAGMA SYSTEMS
NORTH AMERICA
RESOURCE POTENTIAL
RESOURCES
ROCKY MOUNTAIN REGION
SURVEYS
TEMPERATURE LOGGING
USA
UTAH
WELL LOGGING