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Title: Calc-silicate mineralization in active geothermal systems

The detailed study of calc-silicate mineral zones and coexisting phase relations in the Cerro Prieto geothermal system were used as examples for thermodynamic evaluation of phase relations among minerals of variable composition and to calculate the chemical characteristics of hydrothermal solutions compatible with the observed calc-silicate assemblages. In general there is a close correlation between calculated and observed fluid compositions. Calculated fugacities of O{sub 2} at about 320{degrees}C in the Cerro Prieto geothermal system are about five orders of magnitude less than that at the nearby Salton Sea geothermal system. This observation is consistent with the occurrence of Fe{sup 3+} rich epidotes in the latter system and the presence of prehnite at Cerro Prieto.
Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
5794604
Report Number(s):
UCR/IGPP-83/7
ON: DE83016724
DOE Contract Number:
FC07-80ID12145
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products
Research Org:
Stanford Univ., CA (USA). Dept. of Geology; California Univ., Riverside (USA). Inst. of Geophysics and Planetary Physics; Michigan Technological Univ., Houghton (USA). Dept. of Geology and Geological Engineering
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; CERRO PRIETO GEOTHERMAL FIELD; MINERALOGY; CHEMICAL PROPERTIES; MINERALIZATION; PHASE STUDIES; SALTON SEA GEOTHERMAL FIELD; SILICATES; THERMODYNAMICS; GEOTHERMAL FIELDS; OXYGEN COMPOUNDS; SILICON COMPOUNDS Geothermal Legacy 150202* -- Geology & Hydrology of Geothermal Systems-- Non-USA-- (-1989)