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- W2051195911 abstract "Research Article| June 01, 1983 Growth of a zoned plagioclase porphyroblast in a mylonite Robert P. Wintsch; Robert P. Wintsch 1Department of Geology, Indiana University, Bloomington, Indiana 47405 Search for other works by this author on: GSW Google Scholar Robert J. Knipe Robert J. Knipe 2Department of Earth Sciences, The University of Leeds, Leeds LS2-9JT, England Search for other works by this author on: GSW Google Scholar Geology (1983) 11 (6): 360–363. https://doi.org/10.1130/0091-7613(1983)11<360:GOAZPP>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Robert P. Wintsch, Robert J. Knipe; Growth of a zoned plagioclase porphyroblast in a mylonite. Geology 1983;; 11 (6): 360–363. doi: https://doi.org/10.1130/0091-7613(1983)11<360:GOAZPP>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 SocietyGeology Search Advanced Search Abstract Zoning patterns in a plagioclase porphyroblast in a blastomylonite derived from Lewisian gneiss near Loch Eriboll, northwest Scotland, suggest that the crystal grew during deformation. Discontinuities in the concentrations of CaO, K2O, and FeO mark the boundaries of overgrowths and define a core-overgrowth structure. The simultaneous changes in concentration of CaO and K2O are used to construct a qualitative chemical potential diagram that reflects changes in aCa++/a2H+ and aK+/aH+ in the coexisting fluid during growth. Increases in these activity ratios are believed to have caused supersaturation of the grain boundary fluids with respect to plagioclase. The repeated periods of growth indicate repeated overstepping of equilibrium, which could have been caused by ion exchange on surfaces newly exposed during deformation. These data fit a model that relates cyclic variations of strain rate in fault zones with cyclic periods of crystal growth, which in turn could have a major influence on fault rock rheology. 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." @default.
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- W2051195911 title "Growth of a zoned plagioclase porphyroblast in a mylonite" @default.
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