Hydrothermal Alteration as an Indicator of Temperature and Flow Regime in the Cerro Prieto Geothermal Field of Baja California

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Journal Article: Hydrothermal Alteration as an Indicator of Temperature and Flow Regime in the Cerro Prieto Geothermal Field of Baja California

Abstract
More than 65 boreholes, 1.5-3.5 km deep, have encountered temperatures ~350°C and brines with 51% total dissolved solids in the Cerro Prieto geothermal field of the Sal ton Trough intracontin- ental rift system. Temperature-dependent dehydra- tion and decarbonation reactions have produced progressive hydrothermal a1 teration in the deltaic sediments of the reservoir to form greenschist fac i es roc ks . We have applied various methods of geother- mometry, including authigenic mineral assemblages and light stable isotopes, to study temperature distribution and fluid-rock interaction in the sub- surface. These data have revealed a pattern of mineral zones and isotopic ratios in the rocks which defines the shape of the reservoir and re- cords the pattern of hydrothermal circulation prior to production. We infer that a thermal plume, elongated in a NW-SE direction, dips at 45" to the NE; it is recharged from the NE and discharges to the SW.

Authors 
Wilfred A. Elders, James R. Hoagland and Alan E. Williams








Published Journal 
Geothermal Resources Council Transactions, 1980





DOI 
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Online 
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Citation

Wilfred A. Elders,James R. Hoagland,Alan E. Williams. 1980. Hydrothermal Alteration as an Indicator of Temperature and Flow Regime in the Cerro Prieto Geothermal Field of Baja California. Geothermal Resources Council Transactions. 4:121-124.