Occurrence of wide-chain Ca-pyriboles as primary crystals in the Salton Sea Geothermal Field, California, USA
dc.contributor.author | Yau, Yu -Chyi | en_US |
dc.contributor.author | Peacor, Donald R. | en_US |
dc.contributor.author | Essene, Eric J. | en_US |
dc.date.accessioned | 2006-09-11T18:52:09Z | |
dc.date.available | 2006-09-11T18:52:09Z | |
dc.date.issued | 1986-09 | en_US |
dc.identifier.citation | Yau, Yu -Chyi; Peacor, Donald R.; Essene, Eric J.; (1986). "Occurrence of wide-chain Ca-pyriboles as primary crystals in the Salton Sea Geothermal Field, California, USA." Contributions to Mineralogy and Petrology 94(1): 127-134. <http://hdl.handle.net/2027.42/47344> | en_US |
dc.identifier.issn | 0010-7999 | en_US |
dc.identifier.issn | 1432-0967 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/47344 | |
dc.description.abstract | Amphiboles and pyroxenes occurring in the Salton Sea Geothermal Field were found to contain coherent intergrowths of chain silicates with other than double and single chain widths by using transmission and analytical electron microscopy. Both occur in the biotite zone at the temperature (depth) interval of 310° C (1,060 m) to 330° C (1,547m) which approximately corresponds to temperatures of the greenschist facies. The amphiboles occur as euhedral fibrous crystals occupying void space and are composed primarily of irregularly alternating (010) slabs of double or triple chains, with rare quadruple and quintuple chains. Primary crystallization from solution results in euhedral crystals. Clinopyroxenes formed mainly as a porefilling cement and subordinately as prismatic crystals coexisting with fibrous amphiboles. Fine lamellae of double and triple chains are irregularly intercalated with pyroxene. AEM analyses yield formulae (Ca 1.8 Mg 2.9 Fe 1.9 Mn 0.1 ) Si 8 O 21.8 (OH) 1.8 (310° C) and (Ca 2.0 Fe 2.5 Mg 2.3 ) Si 8 O 21.8 (OH) 2.0 (330° C) for amphiboles and (Ca 1.1 Fe 0.6 Mg 0.3 ) Si 2 O 6 for clinopyroxene. Thermodynamic calculations at P fluid =100 bar of equilibrium reactions of (1) 3 chlorite +10 calcite + 21 quartz = 3 actinolite + 2 clinozoisite + 8 H 2 O + 10 CO 2 and (2) actinolite+ 3 calcite+ 2 quartz = 5 clinopyroxene + H 2 O + 3 CO 2 using Mg-end member phases indicate that formation of amphibole and pyroxene require very water-rich conditions at temperatures below 330° C. | en_US |
dc.format.extent | 2697038 bytes | |
dc.format.extent | 3115 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Springer-Verlag | en_US |
dc.subject.other | Geosciences | en_US |
dc.subject.other | Mineral Resources | en_US |
dc.subject.other | Geology | en_US |
dc.subject.other | Mineralogy | en_US |
dc.title | Occurrence of wide-chain Ca-pyriboles as primary crystals in the Salton Sea Geothermal Field, California, USA | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Geology and Earth Sciences | en_US |
dc.subject.hlbsecondlevel | Chemistry | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, The University of Michigan, 48109, Ann Arbor, MI, USA | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, The University of Michigan, 48109, Ann Arbor, MI, USA | en_US |
dc.contributor.affiliationum | Department of Geological Sciences, The University of Michigan, 48109, Ann Arbor, MI, USA | en_US |
dc.contributor.affiliationumcampus | Ann Arbor | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/47344/1/410_2004_Article_BF00371233.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1007/BF00371233 | en_US |
dc.identifier.source | Contributions to Mineralogy and Petrology | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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