Origin of high-potassium, talc-alkaline, I-type granitoids

Abstract

Research Article| September 01, 1993 Origin of high-potassium, calc-alkaline, I-type granitoids Malcolm P. Roberts; Malcolm P. Roberts 1Department of Geology, University of Manchester, Manchester M13 9PL, England Search for other works by this author on: GSW Google Scholar John D. Clemens John D. Clemens 1Department of Geology, University of Manchester, Manchester M13 9PL, England Search for other works by this author on: GSW Google Scholar Author and Article Information Malcolm P. Roberts 1Department of Geology, University of Manchester, Manchester M13 9PL, England John D. Clemens 1Department of Geology, University of Manchester, Manchester M13 9PL, England Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (9): 825–828. https://doi.org/10.1130/0091-7613(1993)021<0825:OOHPTA>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 MailTo Tools Icon Tools Get Permissions Search Site Citation Malcolm P. Roberts, John D. Clemens; Origin of high-potassium, calc-alkaline, I-type granitoids. Geology 1993;; 21 (9): 825–828. doi: https://doi.org/10.1130/0091-7613(1993)021<0825:OOHPTA>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 Many I-type granitoid magmas are generated through partial melting of older metaigneous rocks, and the compositions of such melts are broadly calc-alkaline and metaluminous. These melts are granitic to tonalitic, and result from thermal extremes in their lower crustal source regions. Data on the experimental partial melting of common crustal rocks suggest that high-K, I-type granitoid magmas can be derived only from the partial melting of hydrous, calc-alkaline to high-K calc-alkaline, mafic to intermediate metamorphic rocks in the crust. Because of their low K2O contents, metabasaltic rocks of all kinds are unsuitable as sources, and models that propose mixing of mantle-derived basaltic magmas and crustal melts are also inadequate. There is no requirement that I- type calc-alkaline magmatism be related in any way to subduction processes. 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.