Deep fluid circulation and isotopic alteration in The Geysers geothermal system: profile models

摘要

Rock alteration patterns related to the large felsic intrusive complex (felsite) beneath The Geysers steam field (California, USA) are important indicators of the origins of the modern Geothermal system. Metagreywakce host rocks for the system show widespread moderate Oxygen isotope alteration in the permeable steam reservoir above the felsite, with con- Centrated alteration low on the flanks of the intrusion.