1969/01/01 by LINCOLN S. HOLLISTER, L. S. Hollister · 1 citation
Computer Science · Earth and Planetary Sciences · #Geochemistry and Geologic Mapping #Geological Modeling and Analysis #Geological and Geochemical Analysis
paper · doi:10.1130/0016-7606(1969)80[2465:cmitka]2.0.co;2
Research Article| December 01, 1969 Contact Metamorphism in the Kwoiek Area of British Columbia: An End Member of the Metamorphic Process LINCOLN S HOLLISTER LINCOLN S HOLLISTER Department of Geology, University of California, Los Angeles, California 90024 PRESENT ADDRESS: DEPARTMENT OF GEOLOGICAL AND GEOPHYSICAL SCIENCES, PRINCETON UNIVERSITY, PRINCETON, NEW JERSEY 08540 Search for other works by this author on: GSW Google Scholar Author and Article Information LINCOLN S HOLLISTER PRESENT ADDRESS: DEPARTMENT OF GEOLOGICAL AND GEOPHYSICAL SCIENCES, PRINCETON UNIVERSITY, PRINCETON, NEW JERSEY 08540 Department of Geology, University of California, Los Angeles, California 90024 Publisher: Geological Society of America Received: 10 Mar 1969 Revision Received: 09 Jun 1969 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1969, 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 (1969) 80 (12): 2465–2494. https://doi.org/10.1130/0016-7606(1969)80[2465:CMITKA]2.0.CO;2 Article history Received: 10 Mar 1969 Revision Received: 09 Jun 1969 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation LINCOLN S HOLLISTER; Contact Metamorphism in the Kwoiek Area of British Columbia: An End Member of the Metamorphic Process. GSA Bulletin 1969;; 80 (12): 2465–2494. doi: https://doi.org/10.1130/0016-7606(1969)80[2465:CMITKA]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 The Kwoiek area of British Columbia has undergone high-pressure contact metamorphism at the eastern flank of the Coast Range batholithic complex. The major prograde metamorphic reactions in the sedimentary rocks are: A possible metastable reaction occurring between equations 2 and 3 is Compositional zoning in individual garnets is principally the result of depletion of the constituent elements of the garnet from a homogeneous matrix as the garnet grows. Minerals such as garnet, which by growth can change the composition of the matrix due to the fact that they do not internally equilibrate in response to changing external conditions, are termed "refractory" phases. It is shown that staurolite and probably ilmenite are "refractory" phases. During resorbtion of the refractory phase ilmenite, iron is added to the matrix, which gives rise to decreasing Mg/Fe in the concurrently growing garnet and staurolite. Biotite, chlorite, and presumably muscovite are homogeneous minerals that continuously internally equilibrate in response to changing external conditions, including retrograde metamorphism; therefore, they are considered to form the matrix from which the refractory minerals grow.Differences between measured electron micro-probe profiles of garnet grains and those calculated for a depletion model are due mainly to the effect of Mn on the Mg/Fe ratio in the garnet and partly to changing relative proportions of chlorite, muscovite, and biotite during the growth of the garnet.Higher grade assemblages appear to be the result of bypassing of lower grade assemblages. This leads to a model of overstepping of reactions that is tested by an analysis of garnet zoning profiles from assemblages that contain a limiting garnet composition (that is, the garnet composition projects at a corner of an assemblage polyhedron). The composition of these garnets is a function of the temperature at which they grew, which was nearly constant for each garnet.Magnesian chlorite persists stably with sillimanite, in the absence of muscovite; staurolite with a moderate zinc content persists with quartz in the highest grade rocks of the Kwoiek area. 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.