 | | 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...temperature, neutral-pH assemblage. Some chlorite, epidote and illite in the reservoir rock formed at temperatures...hydrothermal eruptions. The output of gas to the geothermal fluid decreased, while the salinity (10,000 mg/kg |  | | Journal (article/letter/editorial) | | ISOTOPE SHIFT DATAAND THE NATURAL EVOLUTION OF GEOTHERMAL SYSTEMS PETER BLATTNER New Zealand Geological...Isotope shift data and the natural evolution of geothermal systems. In: Y. Kitano (Guest-Editor), Water--Rock...Since most of the actual isotope exchange in geothermal systems takes place in reaction zones with a...water throughput, or hydrological maturity, of geothermal systems in terms of the measurable isotope shifts...late stages of evolution. Several examples of geothermal systems are discussed and placed into a tentative |  | Bargar, Keith E., Keith, Terry E.C., Trusdell, Frank A., Evans, S.R., Sykes, M.L. (1996) Hydrothermal alteration mineralogy of SOH drill holes, Kilauea East Rift Zone geothermal area, Hawaii. Open-File Report Vol. 1996 (96-10) US Geological Survey doi:10.3133/ofr9610 | Report (issue) | | Mineralogy of SOH Drill Holes, Kilauea East Rift Zone Geothermal Area, Hawaii By Keith E. Bargar 1 , Terry E...FIGURES 1. Map showing the location of three SOH geothermal drill holes and the earlier HGP-A drill hole...acicular, epidote crystals deposited on a fracture in vesicular basalt. B. Closer view of epidote crystals...chlorite and fibrous actinolite/tremolite. Prismatic5 epidote crystals may have formed earlier than garnet.....actinolite/tremolite(?)................... 60 34. Euhedral epidote crystals, later quartz crystals, and still later |  | | Journal (article/letter/editorial) | | The chemistry of geothermal waters in Iceland. III. Chemical geothermometry in geothermal investigations...revised_form December 13, 1982) Abtraet-New data from geothermal wells in Iceland have permitted empirical calibration...estimating underground temperamres in fumarolic geothermal fields. Its application involves analysis of...applications of geochemistry in the exploration of geothermal resources involves estimation of underground...is possible to evaluate temperatures in deep geothermal reservoirs below the cooiing zones by using chemical |  | 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) | | calc-silicates in geothermal systems areheulandite, laumontite,wairakite,prehnite,epidote,garnet,sphene,clinopyroxene...rat temperaturesbelow 200øC, whereaswairakite,epidote,prehnite,and actinoliteoccurwithin the rangeof...Suchobservations are critical erals in worldwide active geothermal systemsare in evaluatingcalc-silicatephaserelationsin...andcompositional In the pasttwentyyearsexplorationof geothermal variationsof specificcalc-silicatemineralsin...Minerals in Geothermal Systems Metasomaticcalc-silicatesreported in cores and • .... • FeO / ß Epidote ß Actinolite |  | | 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...prismatic epidote and blocky prehnite crystals .............................85 38. Prismatic epidote crystal...14. 15. Hydrothermal minerals identified from geothermal drill holes at Medicine Lake volcano and the |  | | Report (chapter) | | Chicago on July 8, 2015 Environmental impact of geothermal energy utilization STEF/~N A R N O R S S O N...(e-mail stefanar@raunvis.hi.is) Abstract: Presently geothermal energy accounts for 0.25% of the annual world-wide...Extraction of heat from geothermal reservoirs involves drillings. Exploitation of geothermal resources is generally...it preferable as a source for power and heat. Geothermal energy exploitation has locally some adverse...and cause land subsidence. The development of geothermal fields must sometimes be evaluated against the |  | | Report (volume) | | volume were the basis for a two-day short course on Epidote Minerals held prior (June 3Ã4, 2004) to the 2004...series excellently fulfills this requirement. The epidote minerals have not yet been covered and we felt...felt that this gap should be filled. The epidote mineral group consists of important rock-forming minerals...minerals such as clinozoisite and epidote, geochemical important accessory minerals such as allanite, and minerals...structural and paragenetic similarity to the epidote minerals. Epidote minerals occur in a wide variety of rocks |
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