 | | 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) | | mostcommonmetasomatic calc-silicates in geothermal systems areheulandite, laumontite,wairakite,prehnite,epidote,garnet...Suchobservations are critical erals in worldwide active geothermal systemsare in evaluatingcalc-silicatephaserelationsin...andcompositional In the pasttwentyyearsexplorationof geothermal variationsof specificcalc-silicatemineralsin...been no current com- commonphases(heulandite,laumontite,and wairpilationofthevastdatabaseof compositional...pressuresin deep drill holes. Calc-Silicate Minerals in Geothermal Systems Metasomaticcalc-silicatesreported in |  | | Journal (article/letter/editorial) | | located in the Coromandel Peninsula of the North Island of New Zealand (Fig. 1). It contains *A digital... Auckland 38°S 0 200 km 0 N Great Barrier Island Coromandel Peninsula 20 km Alluvial sediments...location of the Hauraki goldfield within the North Island of New Zealand. Previously published fluid inclusion...inclusion fluids with the reservoir fluids in geothermal fields from around the world. Furthermore, the...occur together with various zeolites including laumontite, clinoptilolite, mordenite, and stilbite (Simpson |  | | 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...Scanning electron micrograph of euhedral, prismatic laumontite crystals ..... .49 Ca+Mg Na K+Ba+Sr ternary diagram...diagram for electron microprobe analyses of laumontite.............................................. |  | | 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...unpublished results), and in hydrothermal epidote from geothermal fields (Bird and Spieler 2004), and might in...define a field of optical positive sign on the Al-rich side of the ternary system, and this field extends |
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