Tectonic Setting and Geochemistry of Submarine Volcanics from the Northern Termination of the Tonga Arc: Implications for the Involvement of Samoan Mantle Plume in Arc-Backarc Magmatism Trevor J. Falloon School of Earth Sciences and Centre for Marine Sciences, UTas, GPO Box 252-79, Hobart, Tasmania 7001, Australia (
[email protected]) Leonid V. Danyushevsky, and Tony J. Crawford Centre for Ore Deposit Research and School of Earth Sciences, UTas, GPO Box 252-79, Hobart, Tasmania 7001, Australia (
[email protected];
[email protected]) Roland Maas, and Jon D. Woodhead School of Earth Sciences, University of Melbourne, Victoria 3010, Australia (
[email protected];
[email protected]) Stephen M. Eggins Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia (
[email protected]) Sherman H. Bloomer, and Dawn J. Wright Department of Geosciences, Oregon State University, Corvallis, OR 97331-5506, USA (
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[email protected]) Sergei K. Zlobin Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 Kosygina Str, 117975, Moscow, Russia (
[email protected]) Andrew R. Stacey School of Earth Sciences, UTas, GPO Box 252-79, Hobart, Tasmania 7001, Australia (
[email protected]) [1] New seafloor mapping and sampling demonstrates that the eruption of the high-Ca boninites is clearly associated with rifting of the northern Tonga ridge and the northern Lau Basin at the northern termination of the Tonga Trench. There is very strong evidence for OIB plume related mantle sources involved in the petrogenesis of lavas erupted in the northern Lau Basin and at the termination of north Tonga ridge.