Deformation mechanisms in the southeastern ramp region of the Pine Mountain block, Tennessee

Research Article| May 01, 1988 Deformation mechanisms in the southeastern ramp region of the Pine Mountain block, Tennessee BILL KILSDONK; BILL KILSDONK 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109 Search for other works by this author on: GSW Google Scholar DAVID V. WILTSCHKO DAVID V. WILTSCHKO 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109 Search for other works by this author on: GSW Google Scholar Author and Article Information BILL KILSDONK 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109 DAVID V. WILTSCHKO 1Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1988) 100 (5): 653–664. https://doi.org/10.1130/0016-7606(1988)100<0653:DMITSR>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation BILL KILSDONK, DAVID V. WILTSCHKO; Deformation mechanisms in the southeastern ramp region of the Pine Mountain block, Tennessee. GSA Bulletin 1988;; 100 (5): 653–664. doi: https://doi.org/10.1130/0016-7606(1988)100<0653:DMITSR>2.3.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 A field and petrofabric study of the southwestern part of the Pine Mountain thrust sheet shows that most deformation features may be attributed to one of two processes. The first, layer-parallel compression, is responsible for (a) a layer-parallel maximum shortening direction in the mechanically twinned fabric of the limestone and dolomite country rock, (b) transport- parallel extension fractures and joints, (c) transport-normal stylolite surfaces, and (d) some small thrusts. The second, bending at thrust-ramp hinges, is responsible for (a) non-bedding-parallel maximum shortening directions in mechanically twinned calcite from fracture fillings, (b)transport-normal extension fractures and joints, and (c) small normal faults. Possible explanations for the failure of calcite in the country rock to twin in response to bending at the ramp include both (1) an early imposed, pre-thrusting, calcite twin strain hardening and (2) deformation of the country rock by competing mechanisms such as pressure solution. Small normal faults are parallel to the strike of the thrust sheet and seem to have evolved from strike-parallel extension fractures in response to continued extension. Both small thrusts and stylolite surfaces are rare in outcrop. There seems to be no major change in deformation of rocks which have traveled through different fractions of the total ramp length, so long as the rocks have passed onto the ramp. 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.