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Formation of Wollastonite by Chemically Reactive Fluid Flow During Contact Metamorphism, Mt. Morrison Pendant, Sierra Nevada, California, USA
Quartz-calcite sandstones experienced the reaction calcite + quartz = wollastonite + CO2 during prograde contact metamorphism at P = 1500 bars and T = 560[degrees]C. Rocks were in equilibrium during reaction with a CO2-H2O fluid with XCO2 = 0[middot]14. The transition from calcite-bearing, wollaston...
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Published in: | Journal of petrology 2001-09, Vol.42 (9), p.1705-1728 |
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container_title | Journal of petrology |
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creator | FERRY, JOHN M. WING, BOSWELL A. RUMBLE, DOUGLAS |
description | Quartz-calcite sandstones experienced the reaction calcite + quartz = wollastonite + CO2 during prograde contact metamorphism at P = 1500 bars and T = 560[degrees]C. Rocks were in equilibrium during reaction with a CO2-H2O fluid with XCO2 = 0[middot]14. The transition from calcite-bearing, wollastonite-free to wollastonite-bearing, calcite-free rocks across the wollastonite isograd is only several millimeters wide. The wollastonite-forming reaction was driven by infiltration of quartz-calcite sandstone by chemically reactive H2O-rich fluids, and the distribution of wollastonite directly images the flow paths of reactive fluids during metamorphism. The mapped distribution of wollastonite and modeling of an O-isotope profile across a lithologic contact indicate that the principal direction of flow was layer-parallel, directed upward, with any cross-layer component of flow |
doi_str_mv | 10.1093/petrology/42.9.1705 |
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Morrison Pendant, Sierra Nevada, California, USA</title><source>Oxford University Press:Jisc Collections:OUP Read and Publish 2024-2025 (2024 collection) (Reading list)</source><creator>FERRY, JOHN M. ; WING, BOSWELL A. ; RUMBLE, DOUGLAS</creator><creatorcontrib>FERRY, JOHN M. ; WING, BOSWELL A. ; RUMBLE, DOUGLAS</creatorcontrib><description>Quartz-calcite sandstones experienced the reaction calcite + quartz = wollastonite + CO2 during prograde contact metamorphism at P = 1500 bars and T = 560[degrees]C. Rocks were in equilibrium during reaction with a CO2-H2O fluid with XCO2 = 0[middot]14. The transition from calcite-bearing, wollastonite-free to wollastonite-bearing, calcite-free rocks across the wollastonite isograd is only several millimeters wide. The wollastonite-forming reaction was driven by infiltration of quartz-calcite sandstone by chemically reactive H2O-rich fluids, and the distribution of wollastonite directly images the flow paths of reactive fluids during metamorphism. The mapped distribution of wollastonite and modeling of an O-isotope profile across a lithologic contact indicate that the principal direction of flow was layer-parallel, directed upward, with any cross-layer component of flow <0[middot]1% of the layer-parallel component. Fluid flow was channeled at a scale of 1-100 m by pre-metamorphic dikes, thrust and strike-slip faults, fold hinges, bedding, and stratigraphic contacts. Limits on the amount of fluid, based on minimum and maximum estimates for the displacement of the wollastonite reaction front from the fluid source, are (0[middot]7-1[middot]9) x 105 cm3 fluid/cm2 rock. The sharpness of the wollastonite isograd, the consistency of mineral thermobarometry, the uniform measured 18O-16O fractionations between quartz and calcite, and model calculations all argue for a close approach to local mineral-fluid equilibrium during the wollastonite-forming reaction.</description><identifier>ISSN: 0022-3530</identifier><identifier>EISSN: 1460-2415</identifier><identifier>DOI: 10.1093/petrology/42.9.1705</identifier><language>eng</language><publisher>Oxford: Oxford Publishing Limited (England)</publisher><ispartof>Journal of petrology, 2001-09, Vol.42 (9), p.1705-1728</ispartof><rights>Copyright Oxford University Press(England) Sep 2001</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a342t-1e35a0a5d0f02655da19c910ac076420734a1ca3595b4e64b863e5b1c5207bd33</citedby><cites>FETCH-LOGICAL-a342t-1e35a0a5d0f02655da19c910ac076420734a1ca3595b4e64b863e5b1c5207bd33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>FERRY, JOHN M.</creatorcontrib><creatorcontrib>WING, BOSWELL A.</creatorcontrib><creatorcontrib>RUMBLE, DOUGLAS</creatorcontrib><title>Formation of Wollastonite by Chemically Reactive Fluid Flow During Contact Metamorphism, Mt. Morrison Pendant, Sierra Nevada, California, USA</title><title>Journal of petrology</title><description>Quartz-calcite sandstones experienced the reaction calcite + quartz = wollastonite + CO2 during prograde contact metamorphism at P = 1500 bars and T = 560[degrees]C. Rocks were in equilibrium during reaction with a CO2-H2O fluid with XCO2 = 0[middot]14. The transition from calcite-bearing, wollastonite-free to wollastonite-bearing, calcite-free rocks across the wollastonite isograd is only several millimeters wide. The wollastonite-forming reaction was driven by infiltration of quartz-calcite sandstone by chemically reactive H2O-rich fluids, and the distribution of wollastonite directly images the flow paths of reactive fluids during metamorphism. The mapped distribution of wollastonite and modeling of an O-isotope profile across a lithologic contact indicate that the principal direction of flow was layer-parallel, directed upward, with any cross-layer component of flow <0[middot]1% of the layer-parallel component. Fluid flow was channeled at a scale of 1-100 m by pre-metamorphic dikes, thrust and strike-slip faults, fold hinges, bedding, and stratigraphic contacts. Limits on the amount of fluid, based on minimum and maximum estimates for the displacement of the wollastonite reaction front from the fluid source, are (0[middot]7-1[middot]9) x 105 cm3 fluid/cm2 rock. 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Morrison Pendant, Sierra Nevada, California, USA</atitle><jtitle>Journal of petrology</jtitle><date>2001-09-01</date><risdate>2001</risdate><volume>42</volume><issue>9</issue><spage>1705</spage><epage>1728</epage><pages>1705-1728</pages><issn>0022-3530</issn><eissn>1460-2415</eissn><abstract>Quartz-calcite sandstones experienced the reaction calcite + quartz = wollastonite + CO2 during prograde contact metamorphism at P = 1500 bars and T = 560[degrees]C. Rocks were in equilibrium during reaction with a CO2-H2O fluid with XCO2 = 0[middot]14. The transition from calcite-bearing, wollastonite-free to wollastonite-bearing, calcite-free rocks across the wollastonite isograd is only several millimeters wide. The wollastonite-forming reaction was driven by infiltration of quartz-calcite sandstone by chemically reactive H2O-rich fluids, and the distribution of wollastonite directly images the flow paths of reactive fluids during metamorphism. The mapped distribution of wollastonite and modeling of an O-isotope profile across a lithologic contact indicate that the principal direction of flow was layer-parallel, directed upward, with any cross-layer component of flow <0[middot]1% of the layer-parallel component. Fluid flow was channeled at a scale of 1-100 m by pre-metamorphic dikes, thrust and strike-slip faults, fold hinges, bedding, and stratigraphic contacts. Limits on the amount of fluid, based on minimum and maximum estimates for the displacement of the wollastonite reaction front from the fluid source, are (0[middot]7-1[middot]9) x 105 cm3 fluid/cm2 rock. The sharpness of the wollastonite isograd, the consistency of mineral thermobarometry, the uniform measured 18O-16O fractionations between quartz and calcite, and model calculations all argue for a close approach to local mineral-fluid equilibrium during the wollastonite-forming reaction.</abstract><cop>Oxford</cop><pub>Oxford Publishing Limited (England)</pub><doi>10.1093/petrology/42.9.1705</doi><tpages>24</tpages><oa>free_for_read</oa></addata></record> |
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title | Formation of Wollastonite by Chemically Reactive Fluid Flow During Contact Metamorphism, Mt. Morrison Pendant, Sierra Nevada, California, USA |
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