 | | Journal (article/letter/editorial) | | deposit, southwest Sumatra, and the Heber geothermal field, California R. S. WHEELER1, P. R. L. BROWNE1...Auckland, Private Bag 92019, Auckland, New Zealand Geothermal Institute, University of Auckland, Private Bag...values being among the most iron-rich reported for prehnite in a hydrothermal environment. Prehnites from...from a diabase sill in the Heber geothermal field of California have mole fractions of octahedral Fe3+ ranging...2208C, some 20 308C lower than those at the Heber field; the lower crystallization temperatures perhaps |  | | Journal (article/letter/editorial) | | the solid inclusions of calcite in Type 2 and prehnite crystals from vesicles and Type 3 veins. Representative...partly or fully with chlorite, or with quartz and prehnite followed by chlorite crystals. In the vesicles...areas, grayish-blue prehnite crystals occur directly on the vein wall (Fig. 8d). Prehnite nodules exhibit...crystals are chemically homogeneous. The rims of the prehnite crystals in places contain laumontite inclusions...crystallization started during the last growth stage of prehnite (Fig. 10e). Type 3 veins are mostly filled by |  | Byrne, Kevin, Lesage, Guillaume, Gleeson, Sarah A., Piercey, Stephen J., Lypaczewski, Philip, Kyser, Kurt (2020) Linking Mineralogy to Lithogeochemistry in the Highland Valley Copper District: Implications for Porphyry Copper Footprints. Economic Geology, 115 (4). 871-901 doi:10.5382/econgeo.4733 | Journal (article/letter/editorial) | | narrow (1â3 cm) halos around a low density of prehnite and/or epidote veinlets. It is, therefore, challenging...(4) prehnite veinlets with white-micaâchlorite-prehnite halos, and (5) veins of epidote ± prehnite with...from protolith lithogeochemical compositions. Prehnite can be a key mineral phase in propylitic alteration...rite (± albite, actinolite, pyrite, hematite, prehnite, and zeolites) and is typically associated with...narrow 1- to 3-cm halos around a low density of prehnite and/or epidote veinlets (Olade and Fletcher, 1975 |  | Moroni, Marilena, Rossetti, Piergiorgio, Naitza, Stefano, Magnani, Lorenzo, Ruggieri, Giovanni, Aquino, Andrea, Tartarotti, Paola, Franklin, Andrea, Ferrari, Elena, Castelli, Daniele, Oggiano, Giacomo, Secchi, Francesco (2019) Factors Controlling Hydrothermal Nickel and Cobalt MineralizationâSome Suggestions from Historical Ore Deposits in Italy. Minerals, 9 (7) 429 doi:10.3390/min9070429 | Journal (article/letter/editorial) | | As-free, AgâPbâTeâSe-bearing CoâNiâCu sulfides, in prehniteâchlorite gangue. Fluid inclusions indicated CoâNi...many similarities with the main Montevecchio vein field to the north [17,20]. Along the development of the...Setting and Field Relationships of the Usseglio Veins 3.2.1. Geological Setting and Field Relationships...maximum thickness up to 6â7 m. Within the fracture field single veins show a total length of about 1 km and...locally WSWâENE), with steep dipping ca. 80 fracture field vein trends can vary from EâW to WNWâESE (and locally |  | | 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...E. P. Hancock, a mineral collector from Franklin/USA) was also already known in the 19th century (Penfield...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 |  | | Conference Proceedings (Volume) | | the Bathtub intrusion (Duluth Complex, Minnesota, USA) .. ...............................................Kawishiwi intrusion, Duluth Complex, Minnesota, USA . . ...............................................ultramafic-mafic complexes of the VizcaĂno Peninsula (Baja California Sur, Mexico), re-visited for platinum-group minerals...Shuangwang hydrothermal breccia gold deposit, Taibai County, Shaanxi Province, China ........................Cleverley Ore-forming processes in Reykjanes geothermal pipelines, Iceland V HardardĂłttir, JW Hedenquist |  | | Book (edition) | | Quaternary geology, mammals and hominid evolution, geothermal, petroleum production and engineering, geological...data base. J.T. (Han) van Gorsel Houston, Texas, USA Common Abbreviations Commonly used abbreviations...Geology Aadland, A.J. & R.S.K. Phoa (eds.) (1981)- Geothermal gradient map of Indonesia, 2nd ed.. Indon. Petroleum...of Halmahera Arc at 11 Ma) Alzwar, M. (1986)- Geothermal energy potential related to active volcanism...in Indonesia. Geothermics 15, p. 601-607. (90 geothermal areas identified in Indonesia, mostly located |
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