 | | Journal (article/letter/editorial) | | Colorado River delta in the Cerro Prieto geothermal system, Baja California, Mexico PETER SCHIFFMAN, 1'2 DENNIS...AND WILFRED A . ELDERS ~ ABSTRACT. The Cerro Prieto geothermal system provides a unique opportunity for...these minerals which include wairakite, epidote, prehnite, actinolite, clinopyroxene, garnet, sphene, biotite...in Cerro Prieto sandstones. KEYWORDS: sandstones, geothermal system, wairakite, epidote, prehnite, actinolite...clinopyroxene, biotite, sphene, garnet, microcline, Cerro Prieto, Mexico. IN recent years, mineralogical and geochemical |  | 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) | | Departmentof Geology,StanfordUniversity,Stanford,California 94305 PETERSCHIFFMAN,* WILFRED A. ELDERS,ALAN...Geophysics and PlanetaryPhysics,Universityof California,Riverside,California92521 AND S. DOUGLAS McDOWELL...calc-silicates in geothermal systems areheulandite, laumontite,wairakite,prehnite,epidote,garnet,sphene...temperaturesbelow 200øC, whereaswairakite,epidote,prehnite,and actinoliteoccurwithin the rangeof temperaturesfrom...octahedralsubstitution of ferric iron for aluminumin epidotes,prehnite,and garnetand of ferrousiron for magnesiumin clinopyroxenes |  | | Book (volume) | | ECONOMIC GEOLOGY, MEXICO The Geology of North America O r > W 4^ *1^ ^ ^ \ \ f ax4 u \ \...of North America Volume P-3 Economic Geology^ Mexico Edited by Guillermo P. Salas Geologo Consultor...Centro Minero Nacional Carretera Mexico-Pachuca Pachuca, Hgo., Mexico, D.F. 1991 EXPLORATION LIBRARY...LIBRARY UNION OIL CO. OF CALIFORNIA P. O. BOX 4570 HOUSTON, TEXAS 77210-4570 1 Acknowledgment Publication...Oil Company Texaco, Inc. Union Oil Company of California Union Pacific Corporation and its operating companies: |  | | Journal (article/letter/editorial) | | Printed III U.S.A. New gas geothermometers for geothermal Calibration and application + 00 exploration-...that the concentrations of CO*, H2S and Hz in geothermal reservoir waters are fixed through equilibria...buffers. At temperatures above 230°C epidote + prehnite + calcite + quartz are considered to buffer COZ...pyrrhohte + epidote + prehnite seem to be involved, but pyrite + epidote + prehnite + magnetite or chlorite...predicting subsurface temperatures in high-temperature geothermal systems. They are applicable to systems in basaltic |  | | Journal (article/letter/editorial) | | T h e N e t h e r l a n d s GAS PRESSURES IN GEOTHERMAL SYSTEMS STE FIi.NA R N O R S S O N Science Institute... The partial pressures of CO2, H2S and H2 in geothermal reservoir waters are fixed by temperature-dependent...Introduction Extensive studies of many drilled geothermal fields in the world have shown that temperatures...(see e.g., Stef~nsson and BjSrnsson, 1982). Yet geothermal waters contain dissolved gases which will, depending...the partial pressure of CO: in some New Zealand geothermal systems were uniquely related to aquifer temperature |  | | Journal (article/letter/editorial) | | those calculated from the composition of the geothermal fluids of Larderello, Travale, Bagnore and Piancastagnaio...and Cerro Prieto (Mexico), The possible hydrothermal mineral assemblages that best fit the field data...containing minerals frequently found in many geothermal fields epidote, chlorite, K-feldspar, quartz...sulphur fugacities obtained from analyses of geothermal gases and from hydrothermal minerals provides...mineral assemblages in equilibrium with geothermal fluids The geothermal fields considered are those at Larderello |  | | Journal (article/letter/editorial) | | for oxygen isotope disequilibrium in selected geothermal and hydrothermal ore deposit systems David R...1993 ) ABSTRACT There is ample evidence from geothermal systems that temperatures estimated from the...oxygen and hydrogen isotopes in tracer studies on geothermal waters indicates that these fluids are predominantly...isotope shifts in fluids and rocks from selected geothermal systems. 2. Isotopic data Isotopic data on fluids...~1, SaltonSea-_ (~ Krafla ~ Hveragerdi -[ ] Cerro Prieto ~ _ ~ 5 10 I 0 O Sunnyside ~"¢/ / [ ] ,< |  | | Journal (article/letter/editorial) | | Prehnite - Epidote Equilibria and their Petrologic Applications by J. G. LIOU, HYUNG SHIK KIM*, AND SHIGENORI...Department of Geology, Stanford University, Stanford, California 94305 (Received 8 November 1982; in revisedform...revisedform 4 March 1983) INTRODUCTION Epidote and prehnite are common in various low-grade metamorphic rocks...assemblages from active geothermal systems. They may occur together as common prehnite—pumpellyite facies...amygdules in metavolcanic rocks. Both epidote and prehnite are characterized by compositional variations |  | | Journal (article/letter/editorial) | | nondeformative metamorphism, characterized by zeolite, prehnite-pumpellyite and lower greenschist facies assemblages...(pistacitic epidote, pumpellyite + prehnite); (ii) pumpellyite + prehnite + pistacitic epidote; (iii) actinolite...characterized by mineral associations of the zeolite, prehnite-pumpellyite and lower greenschist facies. The...albite to sodic oligoclase (An 16). Pumpell yite, prehnite, chlorite, epidote and white mica are commonly...pumpellyite and iron oxide and less commonly by prehnite and titanite. Hornblende crystals in andesites |  | | Journal (article/letter/editorial) | | Department of Geology, Stanford University, Stanford, California 94305, USA ABSTRACT. The system Na20-CaO MgO...transition from the zeolite through prehnite-pumpellyite to prehnite-actinolite facies. T XFe~+relations...metabasites, subgreenschist facies, zeolites, prehnite, pumpellyite, actinolite, epidote. VERY low-grade...parageneses in the zeolite, prehnite-pumpellyite, pumpellyite-actinolite, and prehnite-actinolite facies as...and disappearance of some index minerals (e.g. prehnite, pumpellyite, and epidote) is controlled by many |  | | 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) | | 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...x Coexisting minerals: Grossularite-andradite, prehnite, pumpellyite and sodic amphibole also show Al-Fe3+...unpublished results), and in hydrothermal epidote from geothermal fields (Bird and Spieler 2004), and might in...clinozoisite from a hydrothermal quartz vein (Baja California; sample # 81/370, Fig. 15a-d; see also back |  | | Journal (article/letter/editorial) | | The Schreinemakers' relations for pumpellyite, prehnite, clinozoisite, tremolite, grossular, and amesite...the reaction 4 Mg-Al pumpellyite + 2 quartz = 8 prehnite + aluminous septechlorite + 2 H 2 O, locate the...of Earth Sciences, University of California, Riverside, California 92521, U.S.A. Uournal of Petrology...Bulk Composition III Glaucophane Schist, 90 ^-^ California Bulk Composition II Loeche Meta Sandstones Bulk...1976a), the East Taiwan Ophiolite (Liou, 1979), California glaucophane schists (Ernst et al., 1970), and |  | | Report (volume) | | zeolitic tuffs. The authors reported findings of field, laboratory, and theoretical investigations dealing...equilibria and dissolution kinetics, mapping and field relations, and trace element geochemistry. The concurrent...Seasonal diagenetic changes in salts of Owens Lake, California, 1970-77, by George I. Smith and Irving Friedman...outer continental-shelf sediments from the Gulf of Mexico, by Lorraine H. Filipek 31 Mobility and distribution...grade, and temperature in the Cerro Prieto, Salton Sea, and East Mesa geothermal systems, Salton Trough, United |  | | Journal (article/letter/editorial) | | quartz and (depending on temperature) epidote, prehnite or one of the Ca-zeolites. Relative Nat, K+, Mg*+...lower Yw~ahes and higher silica activities. In geothermal systems dissolved silica activities generally...clay minerals over sodium clay phases in most geothermal alteration assemblages; secondary processes,...bound to move down into the feldspar stability field, while inco~mtion of an alkali feldspar into a solid...(4) and ~~~~i~e In Fig. 2 the stability of geothermal mineral phases is given in terms of A&, = log |  | | Journal (article/letter/editorial) | | alteration assemblage albite + chlorite + titanite f prehnite f pumpellyite f calcite f muscovite f quartz (considered...alteration assemblage is variable with pumpellyite prehnite calcite - titanite & chlorite (*quartz). The domains...associated with obvious fluid channelways. A central prehnite-dominated zone typically has a rim with the assemblage...assemblage pumpellyite+ calcite f prehnite chlorite & titanite f K-rich phyllosilicate. These domains...suffered regional metamorphism, assigned to the prehnite- pumpellyite facies on the basis of metabasite |  | | Report (volume) | | Colorado-Federal Center, Bldg. 810 • MENLO PARK, California-Bldg. 3, Rm. 3128, 345 Middlefield Rd. Subscriptions...hydrothermal and fumarolic minerals from outcrops and geothermal drill holes near Mount Hood, Oregon UNITED STATES................................................ Prehnite . .................................... .. ......Hydrothermal Minerals in Selected Mount Hood Geothermal Drill Holes....................................... B. Hydrothermal Minerals Identified from Geothermal Drill Holes and Outcrops in the Mount Hood Area |  | | Book | | muscovite in 1 M-2 M polytype stabilities 2.6.4 Field evidence 2.6.5 Factors affecting the illite 1 Md-2M...Zeolite (ZEO) facies 3.5.2 Prehnite-pumpellyite (PP) facies 3.5.3 Prehnite-actinolite (PrA) facies 3.5...T-X plot for the transition from the zeolite to prehnite-pumpellyite facies 3.8.2 T-X plot for the transition...metamorphism 3.11.2 Hydrothermal metamorphism in geothermal systems 3.11.3 Burial metamorphism 3.11.4 Thermal...Illitization and chloritization of smectite in geothermal areas and under the influence of high thermal |  | | Report (issue) | | Survey 345 Middlefield Road MS/977 Menlo Park, California 94025 This report is preliminary and has not...petrographic investigations of core samples from geothermal prospect wells drilled by Unocal in the vicinity...was to investigate the interplay between the geothermal system and the active fault zone. Specific topics...considered can be separated into two general groups: Geothermal Research Changes in mineralogy with location...rocks may be the local reservoir rock for the geothermal systems. Some granitic and hornfelsic intrusions |  | | Report (chapter) | | Normally, it depends on the depth of subsidence, the geothermal gradient and the heat conductivity of underlying...Barker (1979), in the Cerro Prieto geothermal field of Baja California (Mexico) young sediments of the...coalified. The area belongs to a rift system of high geothermal gradients (up to 160°C km -1) caused by magmatic...Graben, where many boreholes were drilled and geothermal gradients vary considerably (Teichmiiller 1979)...boreholes of the Upper Graben with different geothermal gradients (Sandhausen 1 :42°C km- 1, Harthausen |  | D'Amore, F., Rivera, J.R., Giusti, D., Rossi, R. (1990) Preliminary geochemical and thermodynamic assessment of the geothermal resources, Sulphur Springs area, St Lucia, W.I. Applied Geochemistry, 5 (5) 587-604 doi:10.1016/0883-2927(90)90058-d | Journal (article/letter/editorial) | | geochemical and thermodynamic assessment of the geothermal resources, Sulphur Springs area, St Lucia, W...form 8 June 1990) Abstract--A high-temperature geothermal resource has been located on the island of St... GEOTHERMALBACKGROUND Investigations of the geothermal energy potential of the Sulphur Springs area...1951. In that year a U . N . mission conducted field studies and concluded that power production was...showed a very high geothermal gradient (220°C/km), with the aim to inter- Geothermal resources, St Lucia |  | | Report (volume) | | magnetic field strength. The warm colors (red, orange, and yellow) represent areas of magnetic field highs;...colors (green, blue, and purple) represent magnetic field lows. Advances Related to United States and International...eastcentral Nevada, from interpretation of potential-field anomalies By H. Richard Blank ....................epithermal mineral deposits around the Gulf of California, Mexico: Relationship between mineralization and...concepts became the preferred underpinning of the field as it evolved from a practiced art to a science |  | | Report (issue) | | _______________________________ Laboratory and field analytical techniques ________ Oil and gas resources...Plains _______ Great Basin and California ____________ Gulf of Mexico and Florida _______________ Appalachian...Nuclear-fuel resources _____________________ Geothermal resources _____________________ Regional geologic...region Oregon Western United States Washington California Alaska Statewide Northern West-central East-central...Montana _______________________ Montana ____ New Mexico _ North Dakota Oklahoma _ South Dakota Texas ______ |  | | Report (volume) | | _______________________________ Laboratory and field analytical techniques ________ Oil and gas resources...Plains _______ Great Basin and California ____________ Gulf of Mexico and Florida _______________ Appalachian...Nuclear-fuel resources _____________________ Geothermal resources _____________________ Regional geologic...region Oregon Western United States Washington California Alaska Statewide Northern West-central East-central...Montana _______________________ Montana ____ New Mexico _ North Dakota Oklahoma _ South Dakota Texas ______ |  | | Report (volume) | | Spring oil field: Col 7, “Freeman (1979)” should be under “References”, Col 8 3. Tejon oil field: Col 7,...8 9. Col 1, Yufutsu gas field region should read “Yufutsu oil and gas field region” [Similar correction...in each chapter. David L. Bish Los Alamos, New Mexico 1529-6466/01/0045-0000$10.00 September 1, 2001...31 0 Geothermal areas in volcanic arcs of orogenic belts . . . .310 A ctive and fossil geothermal areas...(apophyllite, gyrolite, pectolite, pumpellyite, prehnite, babingtonite, datolite, corrensite, vesuvianite |
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