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• W2329232081 abstract "Research Article| July 01, 2012 Process of granophyre crystallization in the Long Mountain Granite, southern Oklahoma George B. Morgan, VI; George B. Morgan, VI † ConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA †E-mail: gmorgan@ou.edu Search for other works by this author on: GSW Google Scholar David London David London ConocoPhillips School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA Search for other works by this author on: GSW Google Scholar GSA Bulletin (2012) 124 (7-8): 1251–1261. https://doi.org/10.1130/B30569.1 Article history received: 05 Jul 2011 rev-recd: 16 Nov 2011 accepted: 22 Nov 2011 first online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation George B. Morgan, David London; Process of granophyre crystallization in the Long Mountain Granite, southern Oklahoma. GSA Bulletin 2012;; 124 (7-8): 1251–1261. doi: https://doi.org/10.1130/B30569.1 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 primary objective of this study is to assess the origin of granophyre in the A-type Long Mountain Granite of southwestern Oklahoma. The magma was emplaced as a thin sheet of crystal-poor, water-undersaturated liquid at or near the base of ∼1.4-km-thick, comagmatic rhyolite cover. Phenocrysts of anorthoclase and quartz were the first products of crystallization, and skeletal to subhedral morphologies indicate their growth involved ∼50 °C of thermal and constitutional undercooling. This initial crystallization, ∼50 vol% of the magma in a wt% ratio of anorthoclase:quartz ≈3:1, resulted from decompression and concomitant migration of the alkali feldspar–quartz cotectic boundary. This residual magma represents the liquid present when crystallization culminated with granophyric intergrowth of quartz and alkali feldspar. Sluggish diffusion of silica away from the growth surfaces of anorthoclase phenocrysts resulted in boundary-layer liquids that were supersaturated in quartz, producing initial granophyric intergrowths in which the modal proportions of quartz were greater than that of the liquid composition. From initial quartz-rich compositions, intergrowths do not follow a consistent trend of fractionation. Instead, following variable or oscillating chemical pathways, they approach and hover around a composition appropriate to the pressure and low water content of magma at the emplacement level. Compositional trends of granophyre demonstrate that the intergrowth records a process in which its growth rate exceeded the rate at which aluminosilicate components could diffuse away through magma. Granophyre in both nature and experiment is formed under a variety of pressures and activities of water but in all cases involves the simultaneous crystallization of quartz and alkali feldspar from a viscous granitic liquid that is cooled well below its liquidus temperature. The estimated undercooling for granophyre growth at Long Mountain, and observed in experiments with granitic compositions, is in the range of 70–150 °C. This magnitude of undercooling is similar to that which produces graphic granite, and it is in the cooling regime between spherulitic obsidian (or felsite) and hypidiomorphic-granular granite. 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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• W2329232081 date "2012-03-20" @default.
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• W2329232081 title "Process of granophyre crystallization in the Long Mountain Granite, southern Oklahoma" @default.
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