Dehydration of subducting slow-spread oceanic lithosphere in the Lesser Antilles.

Paulatto, Michele, Laigle, Mireille, Galve, Audrey, Charvis, Philippe, Sapin, Martine, Bayrakci, Gaye, Evain, Mikael and Kopp, Heidrun (2017) Dehydration of subducting slow-spread oceanic lithosphere in the Lesser Antilles. Open Access Nature Communications, 8 (15980). DOI 10.1038/ncomms15980.

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Abstract

Subducting slabs carry water into the mantle and are a major gateway in the global geochemical water cycle. Fluid transport and release can be constrained with seismological data. Here we use joint active-source/local-earthquake seismic tomography to derive unprecedented constraints on multi-stage fluid release from subducting slow-spread oceanic lithosphere. We image the low P-wave velocity crustal layer on the slab top and show that it disappears beneath 60–100 km depth, marking the depth of dehydration metamorphism and eclogitization. Clustering of seismicity at 120–160 km depth suggests that the slab’s mantle dehydrates beneath the volcanic arc, and may be the main source of fluids triggering arc magma generation. Lateral variations in seismic properties on the slab surface suggest that serpentinized peridotite exhumed in tectonized slow-spread crust near fracture zones may increase water transport to sub-arc depths. This results in heterogeneous water release and directly impacts earthquakes generation and mantle wedge dynamics.

Document Type: Article
Keywords: Lesser Antilles Subduction Zone, Dehydration, Earthquake Generation, Fluid Migration, 3D Tomography
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/ncomms15980
ISSN: 2041-1723
Related URLs:
Projects: OBSIVA, Thales Was Right
Date Deposited: 27 Jul 2017 06:53
Last Modified: 06 Feb 2020 09:07
URI: http://oceanrep.geomar.de/id/eprint/38915

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