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High magmatic flux during Alpine-Himalayan collision: Constraints from the Kal-e-Kafi complex, central Iran

2009; Geological Society of America; Volume: 121; Issue: 5-6 Linguagem: Inglês

10.1130/b26279.1

1943-2674

Jamshid Ahmadian, Michael Haschke, Iain McDonald, Marcel Regelous, M. RezaGhorbani, Mohammad Hashem Emami, Mamoru Murata,

High-pressure geophysics and materials

Research Article| May 01, 2009 High magmatic flux during Alpine-Himalayan collision: Constraints from the Kal-e-Kafi complex, central Iran Jamshid Ahmadian; Jamshid Ahmadian 1Department of Geology, Payam-e Noor University, Kohandej, Isfahan, Iran and Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran Search for other works by this author on: GSW Google Scholar Michael Haschke; Michael Haschke † 2Department of Geology, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa †E-mail: haschkem.sci@ufs.ac.za Search for other works by this author on: GSW Google Scholar Iain McDonald; Iain McDonald 3School of Earth Sciences, Cardiff University, Cardiff CF10 3YE, UK Search for other works by this author on: GSW Google Scholar Marcel Regelous; Marcel Regelous 4Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK Search for other works by this author on: GSW Google Scholar Mohammad RezaGhorbani; Mohammad RezaGhorbani 5Department of Geology, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran Search for other works by this author on: GSW Google Scholar Mohammad Hashem Emami; Mohammad Hashem Emami 6Geological Survey of Iran, Meraj Street, P.O. Box 13185-1494, Tehran, Iran Search for other works by this author on: GSW Google Scholar Mamoru Murata Mamoru Murata 7Department of Geosciences, Naruto University of Education, 748 Tokushima 772-8502, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Jamshid Ahmadian 1Department of Geology, Payam-e Noor University, Kohandej, Isfahan, Iran and Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran Michael Haschke † 2Department of Geology, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa Iain McDonald 3School of Earth Sciences, Cardiff University, Cardiff CF10 3YE, UK Marcel Regelous 4Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK Mohammad RezaGhorbani 5Department of Geology, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran Mohammad Hashem Emami 6Geological Survey of Iran, Meraj Street, P.O. Box 13185-1494, Tehran, Iran Mamoru Murata 7Department of Geosciences, Naruto University of Education, 748 Tokushima 772-8502, Japan †E-mail: haschkem.sci@ufs.ac.za Publisher: Geological Society of America Received: 21 Jun 2007 Revision Received: 30 May 2008 Accepted: 12 Jul 2008 First Online: 03 Oct 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2009 Geological Society of America GSA Bulletin (2009) 121 (5-6): 857–868. https://doi.org/10.1130/B26279.1 Article history Received: 21 Jun 2007 Revision Received: 30 May 2008 Accepted: 12 Jul 2008 First Online: 03 Oct 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jamshid Ahmadian, Michael Haschke, Iain McDonald, Marcel Regelous, Mohammad RezaGhorbani, Mohammad Hashem Emami, Mamoru Murata; High magmatic flux during Alpine-Himalayan collision: Constraints from the Kal-e-Kafi complex, central Iran. GSA Bulletin 2009;; 121 (5-6): 857–868. doi: https://doi.org/10.1130/B26279.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Voluminous Eocene gabbros to granites of the Kal-e-Kafi backarc composite intrusion were emplaced prior to the Alpine-Himalayan collision in the central Iranian backarc, but the reasons for precollisional high arc and backarc magmatic productivity (60–53 Ma) are unclear. Diagnostic geochemical signatures are high K2O-Sr contents and successively depleted middle rare earth element (REE) patterns, reflecting a highly metasomatized source and an increasing role for amphibole and garnet (0%–10%) in the relatively younger granites. Release of concealed K-Sr-rich fluids from oceanic fractures and faults during buckling and bulging of a precollisional choking oceanic slab, and melting of phlogopite-bearing lithosphere with subsequent interaction of the melt with lower crustal garnet-amphibolite of a ~40-km-thick crust, can explain the Kal-e-Kafi geochemical and isotopic signatures. Gravimetric data indicating a ~39 km present-day backarc crustal thickness are consistent with geochemical results but also imply little if any collisional crustal thickening of the central Iranian Plateau. High Eocene arc-backarc melt flux prior to collision in this region reflects vigorous thermal convection, which may in fact be diagnostic of collisional magmatism, explaining the presence of postcollisional shoshonitic melts in this and other collisional orogenic settings. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.