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Widespread Hydration of the Back Arc and the Link to Variable Hydration of the Incoming Plate in the Lesser Antilles From Rayleigh Wave Imaging

Harmon, Nicholas; Rychert, Catherine A.; Goes, Saskia; Maunder, Benjamin; Collier, Jenny; Henstock, Timothy; Lynch, Lloyd; Rietbrock, Andreas ORCID iD icon 1; VoiLA Working Group, the [Hrsg.]
1 Geophysikalisches Institut (GPI), Karlsruher Institut für Technologie (KIT)


Subduction zone dynamics are important for a better understanding of natural hazards, plate tectonics, and the evolution of the planet. Despite this, the factors dictating the location and style of volcanism are not well-known. Here we present Rayleigh Wave imaging of the Lesser Antilles subduction zone using the ocean bottom and land seismic data collected as a part of the VoiLA experiment. This region is an important global endmember that represents a slow (<19 mm/yr) convergence rate of old (80–120 Ma), Atlantic lithosphere formed at a slow spreading ridge. We image the fast slab, the fast-overriding plate and the slow mantle wedge across the entire arc. We find slow velocity anomalies (∼4.1 km/s) in the mantle wedge directly beneath the arc with local minima beneath Dominica/Martinique, Montserrat and the Grenadines. We observe that slow velocities in the wedge extend 200 km into the back arc west of Martinique. The slowest mantle wedge velocity anomaly is more muted than several global wedges, likely reflecting the lower temperatures and less partial melt predicted for the Antilles. Subducted fracture zones and plate boundaries are a potential source of hydration, since they are located near the anomalies, although not directly beneath them. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000136991
Veröffentlicht am 01.07.2022
DOI: 10.1029/2021GC009707
Zitationen: 6
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1525-2027
KITopen-ID: 1000136991
Erschienen in Geochemistry, Geophysics, Geosystems
Verlag John Wiley and Sons
Band 22
Heft 7
Seiten e2021GC009707
Nachgewiesen in Web of Science
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