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Title: Science guide for the Long Valley Caldera deep hole

The Magma Energy Program of the US Department of Energy, Geothermal Technology Division, is planning to begin drilling a deep (6 km) exploration well in Long Valley Caldera, California, in September 1988. The location of the well is in the central part of the caldera, coincident with a large number of shallow (5-7 km) geophysical anomalies identified through many independent investigations. Results from the hole will permit the following: direct investigation of the geophysical anomalies interpreted to be magma; investigation of the patterns and conditions of deep fluid circulation and heat transport below the caldera floor; determination of the amount of collapse and subsequent resurgence of the central portion of Long Valley caldera; and determination of the intrusion history of the central plutonic complex beneath the caldera, and establishment of the relationship of intrusive to eruptive events. The hole will thus provide a stringent test of the hypothesis that magma is still present within the central plutonic complex. If the interpretation of geophysical anomalies is confirmed, the hole will provide the first observations of the environment near a large silicic magma chamber. 80 refs., 7 figs., 2 tabs.
Authors:
;  [1]
  1. (eds.)
Publication Date:
OSTI Identifier:
6069691
Report Number(s):
SAND-89-0155
ON: DE89013332
DOE Contract Number:
AC04-76DP00789
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Research Org:
Sandia National Labs., Albuquerque, NM (USA)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 15 GEOTHERMAL ENERGY; CALDERAS; GEOTHERMAL EXPLORATION; CALIFORNIA; GEOLOGY; GEOPHYSICS; GEOTHERMAL ENERGY; GEOTHERMAL WELLS; HYDROTHERMAL SYSTEMS; MAGMA; VOLCANOES; ENERGY; ENERGY SOURCES; ENERGY SYSTEMS; EXPLORATION; FEDERAL REGION IX; GEOTHERMAL SYSTEMS; NORTH AMERICA; RENEWABLE ENERGY SOURCES; USA; WELLS Geothermal Legacy 580200* -- Geophysics-- (-1989); 150300 -- Geothermal Exploration & Exploration Technology