| Abstract: | We present 45 chemical and isotopic analyses from well discharges at The Geysers geothermal field and summarize the most notable geochemical trends. H2 and H2S concentrations are highest in the Southeast Geysers, where steam samples have ??D and ??18O values that reflect replenishment by meteoric water. In the Northwest Geysers, samples are enriched in gas/steam, CO2, CH4, and N2/Ar relative to the rest of the field, and contain steam that is elevated in ??D and ??18O, most likely due to substantial contributions from Franciscan-derived fluids. The ??13C of CO2, trends in CH4 vs. N2, and abundance of NH3 indicate that the bulk of the non-condensable gases are derived from thermal breakdown of organic materials in Franciscan meta-sediments. |
| Genre: | Article |
| ProdID: | 70020977 |
| Citation Author: | Lowenstern, Jacob, B.; Janik, Cathy; Fahlquist, Lynne; Johnson, Linda, S. |
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| Citation End Page: | 390 |
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| Citation Language: | English |
| Citation Larger Work Title: | Transactions - Geothermal Resources Council |
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| Citation Number Of Pages: | 8 |
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| Citation Publisher: | Geothermal Resources Council |
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| Citation Search Results Text: | Compilation of gas geochemistry and isotopic analyses from The Geysers geothermal field: 1978-1991; 1999; Article; Journal; Transactions - Geothermal Resources Council; Lowenstern, Jacob, B.; Janik, Cathy; Fahlquist, Lynne; Johnson, Linda, S. |
| Citation Start Page: | 383 |
| Citation Volume: | 23 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Compilation of gas geochemistry and isotopic analyses from The Geysers geothermal field: 1978-1991; 1999; Article; Journal; Transactions - Geothermal Resources Council; Lowenstern, Jacob, B.; Janik, Cathy; Fahlquist, Lynne; Johnson, Linda, S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
| Publisher: | Geothermal Resources Council |
