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| 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: |
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| 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...prehnite, actinolite, clinopyroxene, garnet, sphene, biotite, microcline, and calcite. Partitioning of octahedral...of organic material in Cerro Prieto sandstones. KEYWORDS: sandstones, geothermal system, wairakite, epidote...actinolite, clinopyroxene, biotite, sphene, garnet, microcline, Cerro Prieto, Mexico. IN recent years, mineralogical |
 | 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...worldwide.The mostcommonmetasomatic calc-silicates in geothermal systems areheulandite, laumontite,wairakite,prehnite...more of the phasescalcite,prehnite,wairakite,or biotite. From the available datathereisnootherobvious systematic...thelattersystem andthe presenceof prehnite at Cerro Prieto. Introduction patternsof calc-silicatesare |
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| 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 |
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| Hydrothermal Systems: The Case of Los Azufres Geothermal Field, Mexico Ignacio S. Torres-Alvarado a a Universidad...Universidad Nacional Autonoma de Mexico Published online: 14 Jul 2010. To cite this article: Ignacio S...Hydrothermal Systems: The Case of Los Azufres Geothermal Field, Mexico, International Geology Review, 44:7, 639-652...Hydrothermal Systems: The Case of Los Azufres Geothermal Field, Mexico IGNACIO S. TORRES-ALVARADO1 Centro de...mineralogical information related to the Los Azufres geothermal field, along with new isotopic data from hydrothermal |
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| 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 ~"¢/ / [ ] ,< |
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| chlorite, illite, kaoline group, pyrophyllite, biotite) are pivotal for extrapolating important parameters...chemical composition. These data are precious in geothermal exploration and in the study of hydrothermal...reconstruction of a conceptual model of both active (geothermal systems) and fossil (hydrothermal ore deposits)...hydrothermal alteration zoneography of active geothermal systems, is well evidenced in the examples shown...et al. [35]) and (b) Cerro Prieto (redrawn from Elders et al. [36]) geothermal fields. from Cathelineau |
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| com/loi/tigr20 Solute and gas geothermometry of geothermal wells: a geochemometrics study for evaluating...Universidad Nacional Autónoma de México, Temixco, Mexico b Departamento de Sistemas Energéticos, Instituto...Universidad Nacional Autónoma de México, Temixco, Mexico Published online: 11 Dec 2014. Click for updates...Santoyo (2014) Solute and gas geothermometry of geothermal wells: a geochemometrics study for evaluating...REVIEW ARTICLE Solute and gas geothermometry of geothermal wells: a geochemometrics study for evaluating |
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| solution geothermometer The Los Azufres (Mexico) geothermal system Michel Cathelineau 1 and David Nieva...Electricas, Apartado Postal 475, Cuernavaca, Morelos, Mexico Abstract. Chlorite constitutes a major hydrothermal...metamorphism of andesites, in the active geothermal system of Los Azufres (Mexico). Electron microprobe analyses...significantly in the studied field (composition of the host rocks, nature of the geothermal fluids, pressure, ...metamorphism (especially in greenschist facies), in geothermal fields (Tomasson and Kristmannsdottir 1972; McDowell |
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| 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 |
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| state of coexisting feldspars, Salton Sea geothermal field S. DOUGLAS McDOWELL Department of Geology...sandstone in the c.16000 year old Salton Sea geothermal system has produced a suite of chemically equilibrated...feldspar, sandstone, metamorphism, Salton Sea, California, USA. INVESTIGATION of geothermally altered sandstone...McDowell and Paces, 1985) in the Salton Sea geothermal field (McDowell and Elders, 1980, 1983) has shown...250-360 ~ based on temperatures measured in the geothermal borehole. The purpose of this paper is to discuss |
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| prehnite + pistacitic epidote; (iii) actinolite + biotite t pistacitic epidote + chlorite. This broad zonation...crystals in andesites are altered to actinolite and biotite. Alteration minerals present in the groundmass...in minor amounts. Rare actinolite needles and biotite flakes are only found in the groundmass of andesitic...composition with a tendency to extend into the field of sub-calcic augite (Table 1, analyses 10 and 11)...trends of iron enrichment eventually reaching the field of ferroaugite (Table 1, analyses 13 to 15); these |
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| 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 |
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| 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...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...a hydrothermal quartz vein (sample 81-270, Baja California). (a) Outer part of a radially grown aggregate |
 | Bozkaya, Ömer, Bozkaya, Gülcan, Yılmaz, Hüseyin, Hozatlıoğlu, Deniz, Banks, David A. (2019) The origin, age and duration of hydrothermal alteration associated with iron skarn mineralization determined from clay/phyllosilicate minerals, Bizmişen-Erzincan, East-Central Turkey. Ore Geology Reviews, 115. 103179 doi:10.1016/j.oregeorev.2019.103179 | Journal (article/letter/editorial) |
| iron deposits, phyllosilicate minerals (chlorite, biotite/phlogopite, serpentine and talc) mostly develop...textures. K-Ar and 40Ar/39Ar ages of hornblende and biotite from the Bizmişen Pluton gave middle Eocene ages...Microscope (SEM) with a Carl Zeiss Supra 40 VP Field Emission Scanning Electron Microscope (FE-SEM) at...etc.), rare earth elements (REE) and other high field strength elements. Additional information on analytical...composition between phlogopite and annite, i.e. Mg-biotite (Table 2, Fig. 8 a,b). These phlogopites reflect |
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| contains the phases albite, K-feldspar, K-mica, biotite, quartz and (depending on temperature) epidote...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 |
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| 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 |
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| 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...m depth minerals of the green- schist facies (biotite, actinolite) indicate the onset of epi-metamorphism...Graben, where many boreholes were drilled and geothermal gradients vary considerably (Teichmiiller 1979) |
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| by porphyritic T granite, granite porphyry, biotite granite, and monzogranite, and are considered to...Devonian-Jurassic multiphase intrusions, mainly consisting of biotite granite, granite porphyry, gabbro diorite, monzogranite...Permian biotite granite, Triassic monzogranite and granite porphyry, and the Early Jurassic biotite monzogranite... sericite, and chlorite, with less amounts of biotite, epidote, fluorite (Fig. 5H), and calcite (Fig...by K-feldspar, and the formation of secondary biotite and K-feldspar ± sulfide veinlets or veins; (3) |
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| geothermometer is one of the most the temperature of a geothermal reservoir and, as such, it provides a useful...concentration in a geothermal reservoir is controlled by quartz solubility. Occasionally some geothermal tluid leaks...in the reservoir. Thus. the temperature of the geothermal reservoir can be found by determining at what...during its transit through the zone between the geothermal reservoir and the surface. There are three possible...subsurface temperature that is too high. The rising geothermal fluid may also be diluted by groundwater from |
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| __________. Coal resources _______________________ Field investigations. Coal resources data system _. Eastern...resources___________ Nuclear-fuel resources _________ Geothermal resources ______________ Regional geologic investigations...gas fields ____________________________ Known Geothermal Resource Areas __________ Known Recoverable Coal...__________________. Advances in geochronometry ___________. Geothermal systems _________________. Sedimentology_____________________...________________________kilogram KGRA _______Known Geothermal Resources Area KGS _____________Known Geologic |
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| __________. Coal resources _______________________ Field investigations. Coal resources data system _. Eastern...resources___________ Nuclear-fuel resources _________ Geothermal resources ______________ Regional geologic investigations...gas fields ____________________________ Known Geothermal Resource Areas __________ Known Recoverable Coal...__________________. Advances in geochronometry ___________. Geothermal systems _________________. Sedimentology_____________________...________________________kilogram KGRA _______Known Geothermal Resources Area KGS _____________Known Geologic |
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| _______________________________ 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 ______ |
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| _______________________________ 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 ______ |
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| muscovite in 1 M-2 M polytype stabilities 2.6.4 Field evidence 2.6.5 Factors affecting the illite 1 Md-2M...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...three possible ways of passing through the P-T field of very low-grade metamorphism (Figure 1.1). {A)...and mineralogical imprint can be correlated on field evidence with stratigraphically (or tectonically) |
