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Testing a New Model for Initiation of Subduction in the Western Pacific: 3He/4He Analysis of Middle Eocene Boninites

Publisher
British Geological Survey (BGS)
Updated
13 August 2026
Topic
Not set
Licence
Not set

Summary

PROJECT DETAILS ONLY - NO DATA. This proposal seeks to test the hypothesis that a mantle hotspot was responsible for generating boninite magmas in the Izu - Bonin - Mariana (IBM) arc during the middle Eocene. Reconstruction of the plate configuration at that time places the nascent IBM arc close to the location of the present Manus Basin, where a high 3He/4He hotspot has been identified through helium isotope data and tomographic imaging. This project will deliver: 3He/4He data for middle Eocene boninites to resolve the hotspot-present or hotspot-absent models for initiation of the IBM arc. Pb and O isotope ratios and U and Th concentration data to aid in constraining subduction and crustal contamination in the petrogenesis of these rocks. A framework for investigating Archean tectonics and volcanic massive sulphide deposits.

Data links

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Grant Award Details 13/8/2026

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Additional information

Source Metadata
XML, HTML
Date added
12 August 2026
Harvest GUID
9df8df52-d74d-37a8-e044-0003ba9b0d98
Dataset reference date (creation)
2002-07-01
Frequency of update
notApplicable
Access constraints
The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
Responsible party
University of Durham (principalInvestigator); British Geological Survey (distributor, pointOfContact)
ISO 19139 resource type
nonGeographicDataset
Metadata language
eng

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