The Papoose Flat Pluton of eastern California; a reassessment of its emplacement history in the light of new microstructural and crystallographic fabric observations

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doi: 10.1130/SPE272-p361
Authors:Law, R. D.; Morgan, S. S.; Casey, M.; Sylvester, A. G.; Nyman, M.
Author Affiliations:Primary:
Virginia Polytechnic Institute and State University, Department of Geological Sciences, Blacksburg, VA, United States
Australian National University, Australia
Volume Title:second Hutton symposium on the origin of granites and related rocks; proceedings
Volume Authors:Brown, P. E., editor; Chappell, B. W.
Source:Special Paper - Geological Society of America, Vol.272, p.361-375; The second Hutton symposium on the Origin of granites and related rocks, Canberra, Australia, Sept. 23-28, 1991, edited by P. E. Brown and B. W. Chappell. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0072-1077. ISBN: 0-8137-2272-1
Publication Date:1992
Note:In English. Originally publ. in Transact. R. Soc. Edinburgh, Earth Sci., Vol. 83, parts 1 and 2. 63 refs.; illus. incl. sects., sketch maps
Summary:The Papoose Flat pluton was forcibly emplaced with sideways expansion into a series of Cambrian shelf strata. Intense crystal plastic deformation of the mylonitic border facies to the pluton and surrounding country rocks is shown by <= 90% thinning of individual stratigraphic layers in the metamorphic aureole. Microstructural and crystallographic fabric analysis indicates that mylonite formation around the W margin of the pluton was dominantly associated with plane strain deformation. Crystal plastic deformation was restricted to the pluton's gneissic border facies and the overlying aureole rocks. The relatively high deformation T (> 450 degrees C) indicated by the c-axis fabrics in the mylonites means that the pluton acted as a heat source during thrusting-related mylonite formation synchronous with pluton emplacement, or at least commenced during the early stages of pluton cooling. [R.A.H.]
Subjects:Aureoles; Calcite; Carbonates; Contact metamorphism; Country rocks; Deformation; Emplacement; Fabric; Gneisses; Granite gneiss; Granites; Igneous rocks; Intrusions; Lineation; Metamorphic rocks; Metamorphism; Mylonites; Plutonic rocks; Plutons; Quartz veins; Shear; Strain; Structural analysis; Textures; Veins; California; United States; Eastern California; Papoose Flat Pluton
Abstract Numbers:93M/3473
Record ID:1993010086
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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