Hydrothermal alteration of sediments associated with surface emissions from the Cerro Prieto geothermal field
Conference
·
OSTI ID:891301
A study of the mineralogical changes associated with these hydrothermal vents was initiated with the aim of developing possible exploration tools for geothermal resources. The Cerro Prieto reservoir has already been explored by extensive deep drilling so that relationships between surface manifestations and deeper hydrothermal processes could be established directly. Approximately 120 samples of surface sediments were collected both inside and outside of the vents. The mineralogy of the altered sediments studied appears to be controlled by the type of emission. A comparison between the changes in mineralogy due to low temperature hydrothermal activity in the reservoir, seen in samples from boreholes, and mineralogical changes in the surface emission samples shows similar general trends below 180 C: increase of quartz, feldspar and illite, with subsequent disappearance of kaolinite, montmorillonite, calcite and dolomite. These mineral assemblages seem to be characteristic products of the discharge from high intensity geothermal fields.
- Research Organization:
- Institute of Geophysics and Planetary Physics, University of California, Riverside, CA
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 891301
- Report Number(s):
- LBL-11967; CONF-810399-10
- Country of Publication:
- United States
- Language:
- English
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· Trans. - Geotherm. Resour. Counc.; (United States)
·
OSTI ID:6297850