Lower plate serpentinite diapirism in the Calabrian Arc subduction complex

Polonia, A., Torelli, L., Gasperini, L., Cocchi, L., Muccini, F., Bonatti, E., Hensen, Christian, Schmidt, Mark, Romano, S., Artoni, A. and Carlini, M. (2017) Lower plate serpentinite diapirism in the Calabrian Arc subduction complex Nature Communications, 8 (2172). DOI 10.1038/s41467-017-02273-x.

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Abstract

Mantle-derived serpentinites have been detected at magma-poor rifted margins and above subduction zones, where they are usually produced by fluids released from the slab to the mantle wedge. Here we show evidence of a new class of serpentinite diapirs within the external subduction system of the Calabrian Arc, derived directly from the lower plate. Mantle serpentinites rise through lithospheric faults caused by incipient rifting and the collapse of the accretionary wedge. Mantle-derived diapirism is not linked directly to subduction processes. The serpentinites, formed probably during Mesozoic Tethyan rifting, were carried below the subduction system by plate convergence; lithospheric faults driving margin segmentation act as windows through which inherited serpentinites rise to the sub-seafloor. The discovery of deep-seated seismogenic features coupled with inherited lower plate serpentinite diapirs, provides constraints on mechanisms exposing altered products of mantle peridotite at the seafloor long time after their formation.

Document Type: Article
Keywords: Lower plate, serpentinite diapirism, subduction, Calabrian Arc
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
DOI etc.: 10.1038/s41467-017-02273-x
ISSN: 2041-1723
Projects: FLOWS
Date Deposited: 20 Dec 2017 08:24
Last Modified: 20 Dec 2017 08:25
URI: http://eprints.uni-kiel.de/id/eprint/40925

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