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Trace-element geochemistry of volcanic rocks from site 786: The Izu-Bonin Forearc

Murton, Bramley J., Peate, David W., Arculus, Richard J., Pearce, Julian A. and Van der Laan, Sieger 1992. Trace-element geochemistry of volcanic rocks from site 786: The Izu-Bonin Forearc. Proceedings of the Ocean Drilling Program Scientific Results 125 , pp. 211-235. 10.2973/odp.proc.sr.125.133.1992

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Abstract

Eocene-Oligocene volcanic rocks drilled at Site 786 in the Izu-Bonin forearc cover a wide range of compositions from primitive boninites to highly evolved rhyolites. K-Ar dating reveals at least two distinct episodes of magmatism; one at 41 Ma and a later one at 35 Ma. The early episode produced low-Ca boninites and bronzite andesites that form an oceanic basement of pillow lavas and composite intrusive sheets, overlain by flows and intrusive sheets of intermediate-Ca boninites and bronzite-andesites and a fractionated series of andesites, dacites, and rhyolites. The later episode produced high-Ca boninites and intermediate-Ca boninites, exclusively as intrusive sheets.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Publisher: Ocean Drilling Program
ISSN: 1096-7451
Last Modified: 04 Jun 2017 02:04
URI: http://orca-mwe.cf.ac.uk/id/eprint/8471

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