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Evidence for a contribution from two mantle plumes to island-arc lavas from northern Tonga

1997; Geological Society of America; Volume: 25; Issue: 7 Linguagem: Inglês

10.1130/0091-7613(1997)025 2.3.co;2

1943-2682

Jobst Wendt, Marcel Regelous, K. D. Collerson, A. Ewart,

Geological and Geophysical Studies

Research Article| July 01, 1997 Evidence for a contribution from two mantle plumes to island-arc lavas from northern Tonga J. I. Wendt; J. I. Wendt 1Department of Earth Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia Search for other works by this author on: GSW Google Scholar M. Regelous; M. Regelous 1Department of Earth Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia Search for other works by this author on: GSW Google Scholar K. D. Collerson; K. D. Collerson 1Department of Earth Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia Search for other works by this author on: GSW Google Scholar A. Ewart A. Ewart 1Department of Earth Sciences, University of Queensland, St. Lucia, Queensland 4072, Australia Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (7): 611–614. https://doi.org/10.1130/0091-7613(1997)025 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 J. I. Wendt, M. Regelous, K. D. Collerson, A. Ewart; Evidence for a contribution from two mantle plumes to island-arc lavas from northern Tonga. Geology 1997;; 25 (7): 611–614. doi: https://doi.org/10.1130/0091-7613(1997)025 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 Lavas from the islands of Tafahi and Niuatoputapu, at the northern end of the active Tonga-Kermadec arc in the southwest Pacific, were erupted at a convergent plate margin, yet they can be shown to contain a contribution from two different mantle plumes. High concentrations of Nb relative to other high field strength elements in these lavas, compared to other Tonga lavas, reflect an ocean island basalt component in the mantle wedge derived from the nearby Samoa mantle plume. Pb isotope compositions indicate that most of the Pb in these lavas is derived from the oceanic crust of the plume-generated Louisville Seamount Chain, which is being subducted beneath the Tonga arc. These two plume components were thus introduced into the arc lavas in very different ways and provide insight into upper-mantle dynamics and magma-generation processes occurring in an active arc–back-arc system. 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.