Thermal requirements for extensional emplacement of granitoids

Research Article| March 01, 1995 Thermal requirements for extensional emplacement of granitoids R. Brooks Hanson; R. Brooks Hanson 1Science, 1333 H Street, N.W., Washington, D.C. 20005 Search for other works by this author on: GSW Google Scholar Allen F. Glazner Allen F. Glazner 2Department of Geology, University of North Carolina, Chapel Hill, North Carolina 27599 Search for other works by this author on: GSW Google Scholar Geology (1995) 23 (3): 213–216. https://doi.org/10.1130/0091-7613(1995)023<0213:TRFEEO>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation R. Brooks Hanson, Allen F. Glazner; Thermal requirements for extensional emplacement of granitoids. Geology 1995;; 23 (3): 213–216. doi: https://doi.org/10.1130/0091-7613(1995)023<0213:TRFEEO>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyGeology Search Advanced Search Abstract Numerical models of magma emplacement during crustal extension show that shallow (<10 km) rhyolitic to andesitic magma chambers can form and be maintained at typical rates of extension of continental crust. Chambers at depths of 8 km form within 90 ka after emplacement of a total width of 4 km of magma at half extension rates of 2 cm/yr. Once even a small (∼1 km wide) shallow chamber has formed by any process, it can be maintained by extension at a half rate of 1 cm/yr; high temperatures are maintained at a half rate of ∼0.5 cm/yr. Continental rifts and dilational jogs along strike-slip faults in arcs provide areas where extension rates are most appropriate. Large granitoids and batholiths can form by this process over millions of years; actual chambers at any one time may be considerably smaller than preserved granitoids. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.