Cretaceous fore-arc basalts from the Tonga arc: Geochemistry and implications for the tectonic history of the SW Pacific

被引：0

作者：

Falloon, Trevor J. ^{[1
,2
]}

Meffre, Sebastien ^{[3
]}

Crawford, Anthony J. ^{[2
]}

Hoernle, Kaj ^{[4
]}

Hauff, Folkmar ^{[4
]}

Bloomer, Sherman H. ^{[5
]}

Wright, Dawn J. ^{[5
]}

机构：

[1] Institute for Marine and Antarctic Studies (IMAS), Australia

[2] School of Physical Sciences, University of Tasmania, Hobart,TAS,7001, Australia

[3] ARC Centre of Excellence in Ore Deposits, University of Tasmania, Hobart,TAS,7001, Australia

[4] GEOMAR/Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1-3, Keil,D-24148, Germany

[5] College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis,OR,97331-5506, United States

来源：

Tectonophysics | 2014年 / 630卷 / 0C期

基金：

澳大利亚研究理事会; 美国国家科学基金会;

关键词：

Geochemistry; -; Zircon; Tectonics;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The Tonga fore-arc preserves a complex history of subduction initiation, back-arc basin formation and arc volcanism which has extended from the Cretaceous to the present. In this paper, we discuss the geochemistry of a Cretaceous basalt/dolerite/gabbro suite recovered in two dredges from the Tonga fore-arc at ~ 19°S. The geochemistry of the Tonga fore-arc suite is unlike that of the uniformly depleted MORB basalts of the subducting Pacific Plate and therefore is unlikely to be accreted from Pacific Cretaceous crust. The ~ 102. Ma age obtained for one Tongan fore-arc dolerite is contemporaneous with a major phase of Cretaceous subduction-related volcanism, recorded both in detrital zircon age populations and associated volcanics from New Caledonia and New Zealand. We believe that the Tonga fore-arc basalts are a remnant of a hypothesized, once extensive Cretaceous back-arc basin, called the East New Caledonia Basin, which we propose to have existed from ~ 102 to 50. Ma. The allochthonous Poya Terrane of New Caledonia is geochemically very similar to the Tonga fore-arc basalts and represents a younger (~ 84-55. Ma) remnant of the same basin. Subduction-related Cretaceous volcanics from the SW Pacific, representing both arc and back-arc settings, all appear to have similar Zr/Nb values, suggesting a common mantle component in their petrogenesis. The Tonga fore-arc basalts are also similar to fore-arc basalts recovered from the Izu-Bonin-Mariana fore-arc, but unlike these basalts they are not associated with subduction initiation. © 2014 Elsevier B.V.

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页码：21 / 32

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