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Fluid–metasedimentary rock interactions in subduction-zone mélange: Implications for the chemical composition of arc magmas

2004; Geological Society of America; Volume: 32; Issue: 12 Linguagem: Inglês

10.1130/g20877.1

1943-2682

Christopher M. Breeding, Jay J. Ague, Michael Bröcker,

earthquake and tectonic studies

Research Article| December 01, 2004 Fluid–metasedimentary rock interactions in subduction-zone mélange: Implications for the chemical composition of arc magmas Christopher M. Breeding; Christopher M. Breeding 1Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA Search for other works by this author on: GSW Google Scholar Jay J. Ague; Jay J. Ague 1Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, Connecticut 06520-8109, USA Search for other works by this author on: GSW Google Scholar Michael Bröcker Michael Bröcker 2Institut für Mineralogie, Universität Münster, Corrensstrasse 24, 48149 Münster, Germany Search for other works by this author on: GSW Google Scholar Geology (2004) 32 (12): 1041–1044. https://doi.org/10.1130/G20877.1 Article history received: 09 Jun 2004 rev-recd: 16 Aug 2004 accepted: 31 Aug 2004 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Christopher M. Breeding, Jay J. Ague, Michael Bröcker; Fluid–metasedimentary rock interactions in subduction-zone mélange: Implications for the chemical composition of arc magmas. Geology 2004;; 32 (12): 1041–1044. doi: https://doi.org/10.1130/G20877.1 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 SocietyGeology Search Advanced Search Abstract Elevated concentrations of certain large ion lithophile elements (LILE; e.g., Ba, K, Rb, Cs, Ca, Sr), U, and Pb in arc magmas relative to high field strength elements (HFSE; e.g., Ti, Th, Hf, Nb, Zr) are considered key indicators of fluid addition to arc magma source regions worldwide, but the fluid sources and processes of mass transfer are controversial. Dehydration of downgoing slabs releases fluids that can flow through and react with metamorphosed ultramafic-mafic rock packages in mélange zones near slab-mantle interfaces. New geochemical data from Syros, Greece, reveal that these fluids preferentially leach LILEs, U, and Pb when they infiltrate and react with subducted metasedimentary rocks. Transfer of these LILE-, U-, and Pb-enriched fluids to the mantle wedge at subarc depths could directly trigger partial melting and generate magmas with elevated Ba/Th, Sr/Th, Pb/Th, and U/Th, as well as radiogenic Sr. Alternatively, if fluid transfer occurs at shallower depths (e.g., Syros), the metasomatized mantle could be carried deeper by wedge corner flow to ultimately undergo partial melting in subarc regions. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.