Thermal expansion of MgSiO 3 and FeSiO 3 ortho- and clinopyroxenes

Other| August 01, 1997 Thermal expansion of MgSiO3 and FeSiO3 ortho- and clinopyroxenes Demelza Hugh-Jones Demelza Hugh-Jones University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom Search for other works by this author on: GSW Google Scholar American Mineralogist (1997) 82 (7-8): 689–696. https://doi.org/10.2138/am-1997-7-806 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 Demelza Hugh-Jones; Thermal expansion of MgSiO3 and FeSiO3 ortho- and clinopyroxenes. American Mineralogist 1997;; 82 (7-8): 689–696. doi: https://doi.org/10.2138/am-1997-7-806 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search nav search search input Search input auto suggest search filter All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Unit-cell parameters of synthetic (Mg,Fe)SiO3 ortho- and clinopyroxenes were determined at regular intervals in the temperature range 293–1094 K using powder X-ray diffraction techniques. Volume thermal expansion coefficients calculated from these data show that orthopyroxenes expand faster than clinopyroxenes (i.e., αopx > αcpx), irrespective of their composition along the MgSiO3-FeSiO3 join. For both ortho- and clinopyroxenes, αMgSiO3 exceeds αFeSiO3. Axial thermal expansion coefficients calculated for each of the pyroxene phases studied here are a complex function of the changes in structure at high temperature. Thermodynamic calculations of the position of the phase boundary between MgSiO3 ortho- and clinopyroxene show excellent agreement with the experimentally reversed boundary. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.