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Subducted upper and lower continental crust contributes to magmatism in the collision sector of the Sunda-Banda arc, Indonesia

2003; Geological Society of America; Volume: 32; Issue: 1 Linguagem: Inglês

10.1130/g19941.1

1943-2682

Marlina Elburg, Manfred J. van Bergen, John Foden,

earthquake and tectonic studies

Research Article| January 01, 2004 Subducted upper and lower continental crust contributes to magmatism in the collision sector of the Sunda-Banda arc, Indonesia M.A. Elburg; M.A. Elburg 1Max Planck Institute for Chemistry, Geochemistry Division, P.O. Box 3060, 55020 Mainz, Germany, and Department of Geology and Geophysics, University of Adelaide, Adelaide, SA 5005, Australia Search for other works by this author on: GSW Google Scholar M.J. van Bergen; M.J. van Bergen 2Faculty of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, The Netherlands Search for other works by this author on: GSW Google Scholar J.D. Foden J.D. Foden 3Department of Geology and Geophysics, University of Adelaide, Adelaide, SA 5005, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information M.A. Elburg 1Max Planck Institute for Chemistry, Geochemistry Division, P.O. Box 3060, 55020 Mainz, Germany, and Department of Geology and Geophysics, University of Adelaide, Adelaide, SA 5005, Australia M.J. van Bergen 2Faculty of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, The Netherlands J.D. Foden 3Department of Geology and Geophysics, University of Adelaide, Adelaide, SA 5005, Australia Publisher: Geological Society of America Received: 14 Jun 2003 Revision Received: 10 Sep 2003 Accepted: 10 Sep 2003 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (1): 41–44. https://doi.org/10.1130/G19941.1 Article history Received: 14 Jun 2003 Revision Received: 10 Sep 2003 Accepted: 10 Sep 2003 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation M.A. Elburg, M.J. van Bergen, J.D. Foden; Subducted upper and lower continental crust contributes to magmatism in the collision sector of the Sunda-Banda arc, Indonesia. Geology 2004;; 32 (1): 41–44. doi: https://doi.org/10.1130/G19941.1 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 Pb isotopes in igneous rocks from the Banda-Sunda arc show extreme along-arc variations, which correspond to major lithologic changes in crustal components entering the subduction system. An increase in 206Pb/204Pb ratios toward the zone of collision with the Australian continent reflects input of subducted upper-crustal material; maximum values coincide with anomalously radiogenic 3He/4He ratios that have been earlier attributed to the involvement of the continental margin. The collision zone is further characterized by 208Pb/204Pb ratios that are higher for a given 207Pb/204Pb value than observed in the noncollisional sectors, and in the central part of the collision zone, the 206Pb/204Pb ratios are lower than the most radiogenic values in the adjacent areas. We propose that these Pb isotope signatures reflect input of subducted lower crust, mobilized as a result of slab-window formation during arc-continent collision. Variations in Pb isotopes in the collision zone are solely determined by variations in the nature and proportions of different subducted components. The Pb isotope arrays in the noncollision area may be dominated by slab components as well and could reflect mixing between subducted oceanic crust and entrained sediments, rather than between subarc mantle and subducted sediments. Our new interpretation of the Indonesian Pb isotope data does not call for involvement of ocean-island basalt (OIB)–type mantle or Australian subcontinental lithospheric mantle, as has been suggested previously. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.