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O¹⁸/O¹⁶ Ratios of Coexisting Minerals in Glaucophane-Bearing Metamorphic Rocks

Taylor, Hugh P., Jr. and Coleman, Robert G. (1968) O¹⁸/O¹⁶ Ratios of Coexisting Minerals in Glaucophane-Bearing Metamorphic Rocks. Geological Society of America Bulletin, 79 (12). pp. 1727-1756. ISSN 0016-7606. doi:10.1130/0016-7606(1968)79[1727:orocmi];2.

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Oxygen isotope analyses have been obtained for coexisting minerals in several blue-schist-facies metamorphic rocks from California, Oregon, and New Caledonia. Detailed isotopic studies were made on a continuous exposure of schist in Ward Creek, California, previously described by Coleman and Lee (1962). The oxygen isotope fractionations among coexisting minerals in a variety of rock types, including metasediments and metabasalts, are systematic and larger than those measured in pelitic schists metamorphosed at the grade of biotite zone or higher. Therefore, these Ward Creek rocks (termed Type III) must have formed at lower temperatures than have such pelitic schists. Evidence for significant isotopic equilibration and homogenization is observed in the Ward Creek sequence. Six different metasediments and metavolcanics collected within 25 m of one another show almost identical mineral δ;-values: quartz (15.8 to 16.3), aragonite (13.1 to 13.3), glaucophane (9.8 to 10.0), muscovite (10.9 to 11.3), lawsonite (9.3 to 9.5), and garnet (8.0 to 8.4), given as per mil enrichment in O18 relative to mean ocean water. These rocks seem to have reached equilibrium at about the same temperature in contact with abundant metamorphic pore fluids.

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URLURL TypeDescription[1727:orocmi];2DOIArticle
Alternate Title:O18/O16 Ratios of Coexisting Minerals in Glaucophane-Bearing Metamorphic Rocks
Additional Information:We wish to thank Paul Yanagisawa for performing many of the fluorine extractions of oxygen from minerals, and Terry Keith for numerous mineral separations. Financial port for this research was provided by the National Science Foundation, Grant No. GA-513, and by the Alfred P. Sloan Foundation. We are indebted to Prof. W. G. Ernst, University of California at Los Angeles, for a critical reading of the manuscript. Prof. R. N. Brothers, University of Auckland, has been helpful in adding to our knowledge on the New Caledonian glaucophane schist areas, and Dr. M. C. Blake, Jr., U.S. Geological Survey, provided us with samples and mineral separates from the Yolla Bolly area, California.
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Alfred P. Sloan FoundationUNSPECIFIED
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Caltech Division of Geological Sciences1473
Issue or Number:12
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ID Code:117317
Deposited By: Tony Diaz
Deposited On:12 Oct 2022 23:02
Last Modified:12 Oct 2022 23:02

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