Relationship Between O18/O16 Ratios in Coexisting Minerals of Igneous and Metamorphic Rocks

Abstract

Research Article| June 01, 1962 Relationship Between O18/O16 Ratios in Coexisting Minerals of Igneous and Metamorphic Rocks: Part 2. Application to Petrologic Problems HUGH P TAYLOR, JR.; HUGH P TAYLOR, JR. The Pennsylvania State University, University Park, Pa Search for other works by this author on: GSW Google Scholar SAMUEL EPSTEIN SAMUEL EPSTEIN California Institute of Technology, Pasadena, Calif Search for other works by this author on: GSW Google Scholar Author and Article Information HUGH P TAYLOR, JR. The Pennsylvania State University, University Park, Pa SAMUEL EPSTEIN California Institute of Technology, Pasadena, Calif Publisher: Geological Society of America Received: 20 Jun 1960 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1962, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1962) 73 (6): 675–693. https://doi.org/10.1130/0016-7606(1962)73[675:RBORIC]2.0.CO;2 Article history Received: 20 Jun 1960 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation HUGH P TAYLOR, SAMUEL EPSTEIN; Relationship Between O18/O16 Ratios in Coexisting Minerals of Igneous and Metamorphic Rocks: Part 2. Application to Petrologic Problems. GSA Bulletin 1962;; 73 (6): 675–693. doi: https://doi.org/10.1130/0016-7606(1962)73[675:RBORIC]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Oxygen isotopic analyses of coexisting minerals in igneous rocks indicate the crystallization history and mineral paragenesis of these rocks. Detailed variations in the O18/O16 fractionations among minerals can be readily explained on the basis of equilibrium crystallization of magma with incomplete reaction. In every instance in which conclusive information exists, the isotopic results are in excellent agreement with the crystallization sequence determined by conventional geologic criteria. Most rocks analyzed fall into a consistent pattern with respect to petrologic type.As is to be expected on the basis of their lower-temperature origin, O18/O16 fractionations among coexisting minerals in metamorphic rocks are in general somewhat larger than in igneous rocks. These data also suggest, however, that oxygen isotopic equilibrium is not always established during metamorphism. The higher the grade the greater is the apparent tendency for a metamorphic rock to approach the igneous-rock range of oxygen isotopic composition. This is most probably a result of exchange with a reservoir of relatively constant oxygen isotopic composition during metamorphism. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.