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Multiple mantle plume components involved in the petrogenesis of subduction-related lavas from the northern termination of the Tonga Arc and northern Lau Basin: evidence from the geochemistry of arc and backarc submarine volcanics

Citation

Falloon, TJ and Danyushevsky, LV and Crawford, AJ and Maas, R and Woodhead, JD and Eggins, SM and Bloomer, SH and Wright, D and Zlobin, SK and Stacey, AR, Multiple mantle plume components involved in the petrogenesis of subduction-related lavas from the northern termination of the Tonga Arc and northern Lau Basin: evidence from the geochemistry of arc and backarc submarine volcanics, Geochemistry Geophysics Geosystems, 8, (9) pp. 1-45. ISSN 1525-2027 (2007) [Refereed Article]


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Copyright Statement

Copyright 2007 by the American Geophysical Union

DOI: doi:10.1029/2007GC001619

Abstract

We report new geochemical data for boninites and backarc basin-type basalts recovered from the northern termination of the Tonga trench and Lau Basin. Boninitic pillow lavas, ranging from high-Mg compositions to andesites and dacites, have been erupted within large submarine volcanic edifices (calderas and volcanoes) associated with active rifting of both the northern end of the Tofua volcanic arc and in a backarc position relative to the arc volcanoes on the northern Tonga Ridge. The mantle sources in the area are a complex mixture of (1) the "normal" Tongan mantle wedge source that has "Pacific"-type isotopic signature with (2) the plume-related components (EMI, EMII, and HIMU) and (3) an "Indian"-type source upwelling beneath the backarc spreading. Some of these sources, such as the "normal" mantle wedge and variably depleted residual plume mantle, are fluxed by subduction components from the slab, which produces boninites, tholeiites, and mixtures thereof. Other mantle sources, such as "Indian"-type backarc mantle and also some of the plume mantle, produce melts due to adiabatic decompression. These melts are variably mixed with each other and with the slab-fluid fluxed subduction-related melts to form the observed spectrum of magma compositions.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Falloon, TJ (Dr Trevor Falloon)
Author:Danyushevsky, LV (Professor Leonid Danyushevsky)
Author:Crawford, AJ (Professor Anthony Crawford)
Author:Stacey, AR (Mr Andrew Stacey)
ID Code:51596
Year Published:2007
Web of Science® Times Cited:43
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2007-08-01
Last Modified:2012-04-27
Downloads:0

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