Variable water input controls evolution of the Lesser Antilles volcanic arc

Cooper, George F., Macpherson, Colin G., Blundy, Jon D., Maunder, Benjamin, Allen, Robert W., Goes, Saskia, Collier, Jenny S., Bie, Lidong, Harmon, Nicholas, Hicks, Stephen P., Iveson, Alexander A., Prytulak, Julie, Rietbrock, Andreas, Rychert, Catherine A., Davidson, Jon P., Cooper, George F., Macpherson, Colin G., Blundy, Jon D., Maunder, Benjamin, Allen, Robert W., Goes, Saskia, Collier, Jenny S., Bie, Lidong, Harmon, Nicholas, Hicks, Stephen P., Rietbrock, Andreas, Rychert, Catherine A., Davidson, Jon P., Davy, Richard G., Henstock, Tim J., Kendall, Michael J., Schlaphorst, David, van Hunen, Jeroen, Wilkinson, Jamie J., Wilson, Marjorie and , the VoiLA team (2020) Variable water input controls evolution of the Lesser Antilles volcanic arc. Nature, 582 (7813). pp. 525-529. ISSN 0028-0836

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Abstract

Oceanic lithosphere carries volatiles, notably water, into the mantle through subduction at convergent plate boundaries. This subducted water exercises control on the production of magma, earthquakes, formation of continental crust and mineral resources. Identifying different potential fluid sources (sediments, crust and mantle lithosphere) and tracing fluids from their release to the surface has proved challenging1. Atlantic subduction zones are a valuable endmember when studying this deep water cycle because hydration in Atlantic lithosphere, produced by slow spreading, is expected to be highly non-uniform2. Here, as part of a multi-disciplinary project in the Lesser Antilles volcanic arc3, we studied boron trace element and isotopic fingerprints of melt inclusions. These reveal that serpentine—that is, hydrated mantle rather than crust or sediments—is a dominant supplier of subducted water to the central arc. This serpentine is most likely to reside in a set of major fracture zones subducted beneath the central arc over approximately the past ten million years. The current dehydration of these fracture zones coincides with the current locations of the highest rates of earthquakes and prominent low shear velocities, whereas the preceding history of dehydration is consistent with the locations of higher volcanic productivity and thicker arc crust. These combined geochemical and geophysical data indicate that the structure and hydration of the subducted plate are directly connected to the evolution of the arc and its associated seismic and volcanic hazards.

Item Type: Article
Additional Information: Funding Information: Acknowledgements We thank our project partners R. Robertson, J. Latchman, S. Tait and F. Krüger for support and discussion over the course of this project. We thank C. J. de Hoog for assistance with SIMS analysis at the EIMF, S. Kearns for help with EPMA analysis, the German Instrument Pool for Amphibian Seismology (DEPAS), hosted by the Alfred Wegener Institute Bremerhaven, for providing the ocean-bottom and temporary island seismometers, and the Scripps Institution of Oceanography (OBSIP) for providing additional ocean-bottom seismometers. This research was funded by the VoiLA NERC consortium grant (NE/K010824/1). SIMS analysis was funded by EIMF proposals IMF619/0517 and IMF653/0518. Publisher Copyright: © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
Uncontrolled Keywords: general ,/dk/atira/pure/subjectarea/asjc/1000
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Depositing User: LivePure Connector
Date Deposited: 25 Apr 2022 09:30
Last Modified: 15 Jun 2022 12:36
URI: https://ueaeprints.uea.ac.uk/id/eprint/84771
DOI: 10.1038/s41586-020-2407-5

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