Moderate overthickening of thinned sialic crust and the origin of granitic magmatism and regional metamorphism in low-P-high-T terranes

Abstract

Research Article| June 01, 1989 Moderate overthickening of thinned sialic crust and the origin of granitic magmatism and regional metamorphism in low-P-high-T terranes Peter H. Thompson Peter H. Thompson 1Centre Géologique et Géophysique, CNRS/USTL, P. E. Bataillon, 34060 Montpellier Cédex, France Search for other works by this author on: GSW Google Scholar Author and Article Information Peter H. Thompson 1Centre Géologique et Géophysique, CNRS/USTL, P. E. Bataillon, 34060 Montpellier Cédex, France Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1989) 17 (6): 520–523. https://doi.org/10.1130/0091-7613(1989)017<0520:MOOTSC>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 Tools Icon Tools Get Permissions Search Site Citation Peter H. Thompson; Moderate overthickening of thinned sialic crust and the origin of granitic magmatism and regional metamorphism in low-P-high-T terranes. Geology 1989;; 17 (6): 520–523. doi: https://doi.org/10.1130/0091-7613(1989)017<0520:MOOTSC>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 Formation of low-pressure (P)-high-temperature (T) metamorphic terranes by homogeneous shortening and thickening of tectonically thinned sialic crust and overlying sedimentary basins at geologically reasonable strain rates avoids the shortcomings of hypotheses linking the characteristically high geothermal gradients to doubling of normal-thickness crust, crustal extension alone, intrusion of granitoids, or extensive basic magmatism. On the basis of geological and P-T constraints from the Archean Slave province, the P-T histories of three points in a hypothetical block of crust are presented in P-T, P-distance, and P-time diagrams. The relations between the rock that ends up at the surface, base of the basin, base of the crust, isotherms, and depth determine the type of metamorphism and the degree of partial melting required to produce abundant granitoids. This simple qualitative framework can account for the characteristic features of low-P-high-T metamorphic terranes and reconcile those who believe granites are the cause of the metamorphism with those who favor the contrary. 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.