Delamination in collisional orogens

Research Article| October 01, 1990 Delamination in collisional orogens Paul E. Sacks; Paul E. Sacks 1Department of Geology and Geography, L.B. 8149, Georgia Southern College, Statesboro, Georgia 30460 Search for other works by this author on: GSW Google Scholar Donald T. Secor, Jr. Donald T. Secor, Jr. 2Department of Geological Sciences, University of South Carolina, Columbia, South Carolina, 29208 Search for other works by this author on: GSW Google Scholar Author and Article Information Paul E. Sacks 1Department of Geology and Geography, L.B. 8149, Georgia Southern College, Statesboro, Georgia 30460 Donald T. Secor, Jr. 2Department of Geological Sciences, University of South Carolina, Columbia, South Carolina, 29208 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1990) 18 (10): 999–1002. https://doi.org/10.1130/0091-7613(1990)018<0999:DICO>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Paul E. Sacks, Donald T. Secor; Delamination in collisional orogens. Geology 1990;; 18 (10): 999–1002. doi: https://doi.org/10.1130/0091-7613(1990)018<0999:DICO>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 SocietyGeology Search Advanced Search Abstract During continental collision, the weight of the downgoing slab may lead to extensional shearing in the descending plate, permitting separation of the downdip, dense oceanic lithosphere from the adjacent lighter continental lithosphere. Separation may occur by means of a lithosphere-penetrating normal-sense shear zone, by means of pure shear necking of the lithosphere, or by some combination of these mechanisms. During separation, the continental crust attached to the lower plate may undergo an episode of extensional tectonics. The proximity of asthenosphere to crust may result in syntectonic regional metamorphism and plutonism. If the continents continue to converge following delamination, a compressive tectonic regime will be reestablished in the crust. The subsequent cooling of asthenosphere at the base of the crust may lead to the establishment of a continuous flat Moho. The likely imbrication of crustal and mantle lithologies during delamination and during the subsequent compressive tectonic regime, as well as underplating associated with syntectonic plutonism, may account for the seismic complexities observed at Moho depths beneath some mountain belts. 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.