Large volume loss during cleavage formation, Hamburg sequence, Pennsylvania

Research Article| November 01, 1985 Large volume loss during cleavage formation, Hamburg sequence, Pennsylvania Edward C. Beutner; Edward C. Beutner 1Department of Geology, Franklin and Marshall College, Box 3003, Lancaster, Pennsylvania 17604 Search for other works by this author on: GSW Google Scholar Emmanuel G. Charles Emmanuel G. Charles 1Department of Geology, Franklin and Marshall College, Box 3003, Lancaster, Pennsylvania 17604 Search for other works by this author on: GSW Google Scholar Author and Article Information Edward C. Beutner 1Department of Geology, Franklin and Marshall College, Box 3003, Lancaster, Pennsylvania 17604 Emmanuel G. Charles 1Department of Geology, Franklin and Marshall College, Box 3003, Lancaster, Pennsylvania 17604 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1985) 13 (11): 803–805. https://doi.org/10.1130/0091-7613(1985)13<803:LVLDCF>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 MailTo Tools Icon Tools Get Permissions Search Site Citation Edward C. Beutner, Emmanuel G. Charles; Large volume loss during cleavage formation, Hamburg sequence, Pennsylvania. Geology 1985;; 13 (11): 803–805. doi: https://doi.org/10.1130/0091-7613(1985)13<803:LVLDCF>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 SocietyGeology Search Advanced Search Abstract Green reduction spots in red slate of the Hamburg sequence exposed near Shartlesville, Pennsylvania, have axial ratios of 1.42:1.0:0.28 on the limbs of near-isoclinal folds and 1.0:0.79:0.41 in fold hinge zones. Conodont cusps and denticles within the reduction spots have been brittlely pulled apart and give independent measures of extension in various directions. Comparison of conodont extensions with reduction spot shapes on limbs and hinges indicates that sedimentary compaction of 44% preceded the tectonic strain associated with cleavage formation. This strain, having identical maximum extensions but greater shortening in fold hinges as compared to limbs, was characterized by 41% extension in X, no change in Y, 50% to 59% shortening in Z, and 29% to 42% tectonic volume loss. The general lack of directed overgrowths on grains reflects the large volume loss and contrasts with other slates, where deformation was an almost constant volume process and extension in X compensated for shortening in Z. 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.