 | | 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...minerals which include wairakite, epidote, prehnite, actinolite, clinopyroxene, garnet, sphene, biotite, microcline...of organic material in Cerro Prieto sandstones. KEYWORDS: sandstones, geothermal system, wairakite, epidote...prehnite, actinolite, clinopyroxene, biotite, sphene, garnet, microcline, Cerro Prieto, Mexico. IN recent |  | 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...prehnite,epidote,garnet,sphene,clinopyroxene, actinolite,andwollastonite. Conditions oftemperature, pressure...thelattersystem andthe presenceof prehnite at Cerro Prieto. Introduction patternsof calc-silicatesare |  | | 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) | | 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 |  | | Journal (article/letter/editorial) | | pumpellyite + prehnite + pistacitic epidote; (iii) actinolite + biotite t pistacitic epidote + chlorite. This...Hornblende crystals in andesites are altered to actinolite and biotite. Alteration minerals present in the...epidote and pumpellyite in minor amounts. Rare actinolite needles and biotite flakes are only found in...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 |  | | Journal (article/letter/editorial) | | Department of Geology, Stanford University, Stanford, California 94305, USA ABSTRACT. The system Na20-CaO MgO...zeolite through prehnite-pumpellyite to prehnite-actinolite facies. T XFe~+relations were established for...subgreenschist facies, zeolites, prehnite, pumpellyite, actinolite, epidote. VERY low-grade metamorphism and hydrothermal...prehnite-pumpellyite, pumpellyite-actinolite, and prehnite-actinolite facies as defined in this paper (see...been recorded in low-T recrystallization and in geothermal systems (Coomb et al., 1977; Schiffman, pets |  | | Journal (article/letter/editorial) | | Department of Geology, Stanford University, Stanford, California 94305 (Received 8 November 1982; in revisedform...rocks and in hydrothermal assemblages from active geothermal systems. They may occur together as common prehnite—pumpellyite...prehnite-pumpellyite and pumpellyite—actinolite facies and in altered rocks from many geothermal systems. 322 •)• G...ile some CuKJ°) ±0-012 from San Isido, Baja California, with composition C a j ^ e J . ^ A l i ^ F...with epidote and magnetite, occur only in the P-T field of a transition zone shown in Figs. 2-4. The experimental |  | | 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...greenish to dark colored varieties were termed actinolite or schorl and not distinguished from the minerals...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) | | 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 |  | | 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 |  | | Journal (article/letter/editorial) | | 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...cent), on the other hand, occur in pumpellyite-actinolite facies (e.g., Loeche Schists, Coombs et al.,...assemblages grade progressively into pumpellyite-actinolite assemblages, pumpellyite compositions become |  | 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) | | (garnet, diopside, epidote, scapolite and tremolite/actinolite), (2-3) the ophiolite- and limestone-hosted exoskarn...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...exoskarns) garnet, diopside, epidote, tremolite/actinolite, chlorite and calcite occur throughout a contact...retrograde skarn (epidote, chlorite, tremolite/actinolite, phlogopite, serpentine) and subsequently argillic |  | | 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...minerals of the green- schist facies (biotite, actinolite) indicate the onset of epi-metamorphism, although...Graben, where many boreholes were drilled and geothermal gradients vary considerably (Teichmiiller 1979) |  | | 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............ ................. ................ Actinolite ...............................................Hydrothermal Minerals in Selected Mount Hood Geothermal Drill Holes....................................... B. Hydrothermal Minerals Identified from Geothermal Drill Holes and Outcrops in the Mount Hood Area |  | | Journal (article/letter/editorial) | | Schematic sketch presenting a synthesis of the observed field relationships of the different alteration domains...Schill'man (1983). from the Del Puerto Ophiolite. California: Aguirre and Atherton ( 1987). from the Macuchi...Coonibs ( ' I rrl. ( 1976). from pumpellyitc-actinolite facies schists of the l'aveyenne Formation. Switzerland;...Franciscan metabasites of the Cazadero allocthon. California: Bevins and Rowbotham ( 19x3). from metabasites...chlorite compositional field straddles the most aluniinous end of the compositional field for the entire Welsh |  | | Book | | muscovite in 1 M-2 M polytype stabilities 2.6.4 Field evidence 2.6.5 Factors affecting the illite 1 Md-2M...(PP) facies 3.5.3 Prehnite-actinolite (PrA) facies 3.5.4 Pumpellyite-actinolite (PA) facies 3.5.5 Blueschist...plot for the transition from the pumpellyite-actinolite to greenschist facies 3.8.3 P-X plot for the...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 (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 (issue) | | manuscript has benefitted from critical reviews by Cy Field and Tom Nash. lU TABLE OF CONTENTS 1. Introduction...Front Range and elsewhere. Methods of Investigation Field work was done, as weather and mine access permitted...1978, 1979, and the summers of 1980 and 1981. All field work utilized existing published and company surface...were studied and sampled. Samples collected in the field were used for mineralogical and chemical studies...component, and biotite, calcite, clinopyroxene, actinolite, quartz, and feldspars all may be abundant in |  | | Journal (article/letter/editorial) | | Background on Self-Potential 2.1. General 2.2. Field Procedure of Self-Potential 2.3. Anisotropy of Self-Potential...elucidation strategies. Combinations of 17 real field illustrations were examined and a similar investigation...parameters are also discussed. A correlation between the field information and the interpreted model information...zones in the continental crust, well logging, geothermal exploration, hydrogeological investigations,...discussed. This study also shows the results of various field data examples from diverse parts of 89 the world |  | | Book | | problem is greatly increased by the very active field of laboratory zeolite synthesis, which in many cases...diagenetic series, continental and marine sediments, geothermal fields. These clay resources have been exploited...cases it is necessary to introduce the concept of field water capacity of soils. Soils are able to hold...move downwards: this amount of water is called the field capacity and it is available for plant growth or...the variations of the volume of water held at the field capacity and the amount of drainage. Two major soil |  | | Book | | Measurements 3.2.1. Types of Sensor 3.2.2. Calibration of Field Sensors Measurements of Subsurface Temperatures...6.7. References 7. V. CERMAK and R. HAENEL / Geothermal Maps 7.1. Introduction 7.2. General Statements...of Individual Techniques 7.2.5. Corrections in Geothermal Mapping 7.3. Temperature, Temperature Gradient...Gradient 7.3.3. Maps of Heat-Flow Density 7.4. Geothermal Resource and Reserve Representation 7.4.1. Objectives...characteristics should we look for to define an economic geothermal resource? What is the best method for exploring |  | | Book | | D. Meinert, and R. J. Newberry 317 Active Geothermal Systems and Hydrothermal Ore Deposits. Donald...Geology and Geophysics, University of California, Berkeley, California 94720 Abstract The transfer of the...The Sulphide Queen orebody at Mountain Pass, California, also Precambrian in age, contains abundant cerium-group...metasomatism in examples such as West Shasta, California (Reed, 1977). Sericite and pyrophyllite, plus...of petroleum. The pos¬ sible importance of oil field brines as ore carriers, and of migrations of these |  | | Report (issue) | | _______________ Coal analysis _______________________ Field studies ________________ Dating, geochemistry, and...Southwestern United States California ______________________________ Gulf of Mexico and Florida ___________...__—__—_______________ Nuclear-fuel resources _____________ Geothermal resources _________________________ Regional...Pacific coast region _______ —— —— —— _______ California _______________-_—————— Oregon ___________——..._—————————————————— Montana _____-__-__--_-—— New Mexico _———————————————— North Dakota __________-_____ |
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