Laccolith-like emplacement model for the Papoose Flat Pluton based on porphyroblast-matrix analysis

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doi: 10.1130/0016-7606(1998)110<0096:LLEMFT>2.3.CO;2
Authors:Morgan, Sven S.; Law, Richard D.; Nyman, Matthew W.
Author Affiliations:Primary:
Virginia Polytechnic Institute and State University, Department of Geological Sciences, Blacksburg, VA, United States
University of Michigan, Ann Arbor, MI, United States
Volume Title:Geological Society of America Bulletin
Source:Geological Society of America Bulletin, 110(1), p.96-110. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7606
Publication Date:1998
Note:In English. 57 refs.; illus., incl. 1 table, geol. sketch map
Summary:Detailed porphyroblast-matrix analysis with- in the concordant metasedimentary aureole rocks surrounding the Papoose Flat pluton of eastern California indicates that inclusion trails within porphyroblasts can be used as strain markers to restore the aureole rocks to their prepluton emplacement position. Using porphyroblast-matrix relationships in combination with measurement of stratigraphic sections and whole-rock geochemical analyses, we have determined the kinematics of rotation, the change in thickness and volume, and the amount of translation of the metasedimentary formations within the aureole. These data are consistent with initial emplacement of the magma as an inclined sill and subsequent inflation into a pluton or laccolith. The combination of structural and porphyroblast-matrix analysis leads to a three-dimensional kinematic history of the wall rocks wherein vertical upward translation represents a significant part of the pluton emplacement-related strain history.
Subjects:Aureoles; Contact metamorphism; Deformation; Emplacement; Igneous rocks; Intrusions; Laccoliths; Matrix; Metamorphic rocks; Metamorphism; Metasedimentary rocks; Plutonic rocks; Plutons; Porphyroblastic texture; Strain; Structural analysis; Textures; California; Inyo County California; Inyo Mountains; United States; Eastern California; Papoose Flat Pluton
Coordinates:N370000 N373000 W1173000 W1180000
Abstract Numbers:99M/818
Record ID:1998013475
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
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