 | | Journal (article/letter/editorial) | | Alteration and Fluid Geochemistry of the Tongonan Geothermal Field, Philippines Graeme L. SCOTT Abstract: The...during the history of the Tongonan Geothermal Field. Thermal activity in the Tongonan area began in the Miocene...gas was released to a geothermal fluid and condensed in groundwater with geothermal steam. The condensate...hydrothermal eruptions. The output of gas to the geothermal fluid decreased, while the salinity (10,000 mg/kg...mg/kg or ~ 2 wt% NaCl) and the temperature of the geothermal fluid remained nearly constant throughout the |  | Bird, Dennis K., Schiffman, Peter, Elders, Wilfred A., Williams, Alan E., McDowell, S. Douglas (1984) Calc-silicate mineralization in active geothermal systems. Economic Geology, 79 (4) 671-695 doi:10.2113/gsecongeo.79.4.671 | Journal (article/letter/editorial) | | worldwide.The mostcommonmetasomatic calc-silicates in geothermal systems areheulandite, laumontite,wairakite,prehnite...Suchobservations are critical erals in worldwide active geothermal systemsare in evaluatingcalc-silicatephaserelationsin...andcompositional In the pasttwentyyearsexplorationof geothermal variationsof specificcalc-silicatemineralsin...pressuresin deep drill holes. Calc-Silicate Minerals in Geothermal Systems Metasomaticcalc-silicatesreported in...Taiwan X X X X System • landitc Tongonan, Philippines X Broadlands, New X itc dote bole |  | | Report (issue) | | GEOLOGICAL SURVEY Estimated temperatures for geothermal drill holes at Medicine Lake Volcano, northeastern...volcano showing the location of 11 of the 12 geothermal prospect drill holes included in this study ...hydrothermal alteration minerals with depth in sampled geothermal drill holes of the Medicine Lake volcano area....................................... .87 39. Andradite garnet crystals deposited on a fracture ........14. 15. Hydrothermal minerals identified from geothermal drill holes at Medicine Lake volcano and the |  | | Report (volume) | | the last years from several working groups in the field of experimental studies and spectroscopic work....the epdiote minerals, from low temperature in geothermal fields (Chapter 6, Bird and Spieler), to common...(Bonazzi et al. 1996), named after its locality Andros Island/Greece; dissakisite(Ce) (Grew et al. 1991), named...distribution between epidote and grossularite-andradite Heuss- 24 Franz & Liebscher Fe3+ on M1 [p...zoning; x Coexisting minerals: Grossularite-andradite, prehnite, pumpellyite and sodic amphibole also |
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