Epitaxial replacement of kyanite by staurolite; a TEM study of the microstructures

Other| February 01, 1995 Epitaxial replacement of kyanite by staurolite: A TEM study of the microstructures Bernardo Cesare; Bernardo Cesare Universita di Padova, Dipartimento di Mineralogia e Petrologia, Padua, Italy Search for other works by this author on: GSW Google Scholar Bernard Grobety Bernard Grobety Institut fuer Mineralogie und Petrographie, Switzerland Search for other works by this author on: GSW Google Scholar American Mineralogist (1995) 80 (1-2): 78–86. https://doi.org/10.2138/am-1995-1-208 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Bernardo Cesare, Bernard Grobety; Epitaxial replacement of kyanite by staurolite: A TEM study of the microstructures. American Mineralogist 1995;; 80 (1-2): 78–86. doi: https://doi.org/10.2138/am-1995-1-208 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 SocietyAmerican Mineralogist Search Advanced Search Abstract Pelitic schists in the contact aureole of the late-Alpine Vedrette di Ries granodiorite show an epitaxial replacement of kyanite by Fe-rich staurolite. The reaction is observed within nodules of fine-grained staurolite crystals (100–200 μm) containing oriented lamellae of kyanite.Microprobe, backscattered electron microscopy (BSEM), and high-resolution transmission electron microscopy (HRTEM) investigations demonstrate the presence of submicroscopic intergrowths of staurolite and kyanite. The orientation of both phases, aSt||bKy and CSt||cKy, is in agreement with previous observations. Individual staurolite and kyanite lamellae are between one unit cell and some tens of unit cells wide. Detailed observation of the termination of staurolite lamellae within kyanite suggests that the replacement occurs by a solid-state reaction, in which the primary cubic close-packed O framework of kyanite is preserved. The epitaxial replacement implies a reorganization of the site occupancy accompanied by addition of Fe + Mg + H and removal of Si + Al from the reaction site.The epitaxial replacement of metastable kyanite occurred during contact metamorphism within the andalusite stability field, under temperature and pressure conditions of 500–550 °C and >2.9 kbar, respectively. 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.