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
Other:
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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040 |a ViAlAGI  |c ViAlAGI 
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072 7 |a 16  |2 georeft 
100 1 |a Law, R. D.  |e analytic author  |u Virginia Polytechnic Institute and State University, Department of Geological Sciences, Blacksburg, VA 
245 1 4 |a The Papoose Flat Pluton of eastern California; a reassessment of its emplacement history in the light of new microstructural and crystallographic fabric observations 
300 |a p. 361-375 
500 |a In English. Originally publ. in Transact. R. Soc. Edinburgh, Earth Sci., Vol. 83, parts 1 and 2. 63 refs. 
500 |a Abstract number: 93M/3473 
500 |a Abstractor: R.A.H. 
500 |a Affiliation: Virginia Polytechnic Institute and State University, Department of Geological Sciences; Blacksburg, VA; USA; United States 
500 |a Affiliation: Australian National University; ; AUS; Australia 
500 |a Key title: Special Paper - Geological Society of America 
500 |a Source note: 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 
500 |a Publication type: conference paper or compendium article 
504 |b 63 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a 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 #LT= 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 (#GT 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. 
650 7 |a Aureoles  |2 georeft 
650 7 |a Calcite  |2 georeft 
650 7 |a Carbonates  |2 georeft 
650 7 |a Contact metamorphism  |2 georeft 
650 7 |a Country rocks  |2 georeft 
650 7 |a Deformation  |2 georeft 
650 7 |a Emplacement  |2 georeft 
650 7 |a Fabric  |2 georeft 
650 7 |a Gneisses  |2 georeft 
650 7 |a Granite gneiss  |2 georeft 
650 7 |a Granites  |2 georeft 
650 7 |a Igneous rocks  |2 georeft 
650 7 |a Intrusions  |2 georeft 
650 7 |a Lineation  |2 georeft 
650 7 |a Metamorphic rocks  |2 georeft 
650 7 |a Metamorphism  |2 georeft 
650 7 |a Mylonites  |2 georeft 
650 7 |a Plutonic rocks  |2 georeft 
650 7 |a Plutons  |2 georeft 
650 7 |a Quartz veins  |2 georeft 
650 7 |a Shear  |2 georeft 
650 7 |a Strain  |2 georeft 
650 7 |a Structural analysis  |2 georeft 
650 7 |a Textures  |2 georeft 
650 7 |a Veins  |2 georeft 
651 7 |a California  |2 georeft 
651 7 |a United States  |2 georeft 
653 |a Eastern California 
653 |a Papoose Flat Pluton 
700 1 |a Morgan, S. S.,  |e analytic author 
700 1 |a Casey, M.,  |e analytic author 
700 1 |a Sylvester, A. G.,  |e analytic author 
700 1 |a Nyman, M.,  |e analytic author 
700 1 |a Chappell, B. W.,  |e monographic editor 
711 2 |a The second Hutton symposium on the Origin of granites and related rocks  |d (1991 :  |c Canberra, Australia)  
773 0 |a Brown, P. E., editor  |t second Hutton symposium on the origin of granites and related rocks; proceedings  |d Boulder, CO : Geological Society of America (GSA), 1992  |k Special Paper - Geological Society of America  |x 0072-1077  |y GSAPAZ  |n 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 type: conference paper or compendium article  |g Vol. 272  |h illus. incl. sects., sketch maps  |z 0813722721 
856 |u urn:doi: 10.1130/SPE272-p361