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- W2150725132 abstract "Research Article| December 01, 1978 A chemical approach to the preferred orientation of mica ROBERT P. WINTSCH ROBERT P. WINTSCH 1Department of Geology, Indiana University, Bloomington, Indiana 47401 Search for other works by this author on: GSW Google Scholar Author and Article Information ROBERT P. WINTSCH 1Department of Geology, Indiana University, Bloomington, Indiana 47401 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1978) 89 (12): 1715–1718. https://doi.org/10.1130/0016-7606(1978)89<1715:ACATTP>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 Email Permissions Search Site Citation ROBERT P. WINTSCH; A chemical approach to the preferred orientation of mica. GSA Bulletin 1978;; 89 (12): 1715–1718. doi: https://doi.org/10.1130/0016-7606(1978)89<1715:ACATTP>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 SocietyGSA Bulletin Search Advanced Search Abstract The mineralogical and chemical changes accompanying diagenesis in Gulf Coast argillaceous sediments provide a good working model for such changes in similar sediments elsewhere. Knowledge of these reactions allows plausible explanations for mica fabric formation in mildly metamorphosed sediments to be developed.Holeywell and Tullis have identified three preferred orientations of mica across the strain gradient in the Martinsburg Formation at Lehigh Gap, Pennsylvania. These are muscovite in the bedding plane, chlorite at 20° to the bedding plane, and a slaty cleavage defined first by muscovite and with increased strain by chlorite, both at 90° to the bedding plane. The muscovite orientation in the bedding plane is attributed to sedimentary deposition of muscovite and an illite-smectite mixed-layer phase, followed by a replacement of the smectite component by illite during diagenesis. The chlorite is probably diagenetic, and its orientation may reflect a 20° rotation of the bedding plane from the plane normal to λ3. The orientation of muscovite and chlorite in the slaty cleavage is consistent with a pressure solution mechanism causing first the pressure solution of quartz and feldspars and the precipitation of muscovite, and later, with increased strain, the recrystallization of the earlier formed muscovite and chlorite. 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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