Journal article
The relationship between iron redox states and H2O contents in back-arc basin basaltic glasses from the North Fiji Basin
HSC O'Neill, AJ Berry, LV Danyushevsky, TJ Falloon, R Maas, ST Feig
Chemical Geology | ELSEVIER | Published : 2024
Open access
Abstract
Island-arc basalts (IAB) from convergent plate margins tend to have both higher iron oxidation states (higher Fe3+/Fe2+) and higher H2O contents than the mid-ocean ridge basalts (MORB) produced by seafloor spreading, which raises the question of whether these two characteristics are causally related. Back-arc basin basalts (BABB) may help with this question, in that they are products of seafloor spreading, like MORB, but sourced from supra-subduction mantle, like IAB. Here we examine the relationship between Fe3+/Fe2+ (determined by XANES spectroscopy) and H2O contents in BABB glasses from the North Fiji Basin (NFB). The glasses cover a range of compositions from 6.1 to 8.5 wt% MgO, and from..
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Grants
Awarded by Australian Government
Funding Acknowledgements
The authors are grateful for the support of Marine National Facility through voyages SS10/2004, SS08/2006, and Australian Research Council (ARC) through Discovery Projects (DP0342543 and DP180102280) , Centre of Excellence funding (CE0561595) , and LIEF grants (LE0347677, LE0561245, LE0989828, LE100100107, LE160100032) . Support from staff at the Central Science Laboratory and CODES Analytical Laboratories at UTAS in collecting the data presented in this study is greatly acknowledged. LD and TF thank the captains and crews of the RV Southern Surveyor for their dedicated work and support during the two voyages. The XANES spectra were recorded at beamline I18 of Diamond Light Source with the help of Fred Mosselmans. We acknowledge travel funding provided by the International Synchrotron Access Program (ISAP) managed by the Australian Synchrotron, part of ANSTO, and funded by the Australian Government. We would like to thank Antoine Bezos and an anonymous reviewer for their helpful reviews, and Sonja Aulbach for her editorial handling.