Strain Calculated from Twinning in Calcite

Abstract

Research Article| July 01, 1972 Strain Calculated from Twinning in Calcite R. H GROSHONG, JR. R. H GROSHONG, JR. Department of Geology, Syracuse University, Syracuse, New York 13210 Search for other works by this author on: GSW Google Scholar Author and Article Information R. H GROSHONG, JR. Department of Geology, Syracuse University, Syracuse, New York 13210 Publisher: Geological Society of America Received: 07 Sep 1971 Revision Received: 12 Jan 1972 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1972, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1972) 83 (7): 2025–2038. https://doi.org/10.1130/0016-7606(1972)83[2025:SCFTIC]2.0.CO;2 Article history Received: 07 Sep 1971 Revision Received: 12 Jan 1972 First Online: 02 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 R. H GROSHONG; Strain Calculated from Twinning in Calcite. GSA Bulletin 1972;; 83 (7): 2025–2038. doi: https://doi.org/10.1130/0016-7606(1972)83[2025:SCFTIC]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 Deformation of calcite results in polysynthetic twinning on the e plane. Twinning distorts the original grain shape by simple shear of an amount proportional to the total thickness of twinned material. Each twin set is viewed as an internal strain gage in a deformed aggregate of calcite. Each twin set provides one equation relating the strain in a specific orientation to the strain in the aggregate as a whole. The deviatoric strain tensor that characterizes the aggregate is calculated by the simultaneous solution of at least five equations involving the measured shear strains and twin-set orientations as knowns, and the components of strain in the aggregate as unknowns. More than five equations are solved by least squares to provide an estimate of the precision of the strain components. A preliminary field test of the strain-gage calculation technique suggests that the accuracy is within a factor of two.Used on a computer-simulated aggregate of deformed calcite, the strain-gage calculation technique produces the exact magnitudes and orientations of the principal strains. Used on the same simulated aggregate, the dynamic analysis technique of Turner and the earlier strain calculation technique of Conel both estimate the relative magnitudes and orientations of the principal strains. 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.