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dc.contributor.authorDavy, R.G.
Minshull, T.A.
Bayrakci, G.
Bull, J.M.
Klaeschen, D.
Papenberg, C.
Reston, T.J.
Sawyer, D.S.
Zelt, C.A.
dc.date.accessioned 2017-05-03T18:24:05Z
dc.date.available 2017-05-03T18:24:05Z
dc.date.issued 2016
dc.identifier.citation Davy, R.G., Minshull, T.A., Bayrakci, G., et al.. "Continental hyperextension, mantle exhumation, and thin oceanic crust at the continent-ocean transition, West Iberia: New insights from wide-angle seismic." Journal of Geophysical Research: Solid Earth, 121, no. 5 (2016) Wiley: 3177-3199. https://doi.org/10.1002/2016JB012825.
dc.identifier.urihttps://hdl.handle.net/1911/94137
dc.description.abstract Hyperextension of continental crust at the Deep Galicia rifted margin in the North Atlantic has been accommodated by the rotation of continental fault blocks, which are underlain by the S reflector, an interpreted detachment fault, along which exhumed and serpentinized mantle peridotite is observed. West of these features, the enigmatic Peridotite Ridge has been inferred to delimit the western extent of the continent-ocean transition. An outstanding question at this margin is where oceanic crust begins, with little existing data to constrain this boundary and a lack of clear seafloor spreading magnetic anomalies. Here we present results from a 160 km long wide-angle seismic profile (Western Extension 1). Travel time tomography models of the crustal compressional velocity structure reveal highly thinned and rotated crustal blocks separated from the underlying mantle by the S reflector. The S reflector correlates with the 6.0–7.0 km s−1 velocity contours, corresponding to peridotite serpentinization of 60–30%, respectively. West of the Peridotite Ridge, shallow and sparse Moho reflections indicate the earliest formation of an anomalously thin oceanic crustal layer, which increases in thickness from ~0.5 km at ~20 km west of the Peridotite Ridge to ~1.5 km, 35 km further west. P wave velocities increase smoothly and rapidly below top basement, to a depth of 2.8–3.5 km, with an average velocity gradient of 1.0 s−1. Below this, velocities slowly increase toward typical mantle velocities. Such a downward increase into mantle velocities is interpreted as decreasing serpentinization of mantle rock with depth.
dc.language.iso eng
dc.publisher Wiley
dc.rights This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.title Continental hyperextension, mantle exhumation, and thin oceanic crust at the continent-ocean transition, West Iberia: New insights from wide-angle seismic
dc.type Journal article
dc.citation.journalTitle Journal of Geophysical Research: Solid Earth
dc.citation.volumeNumber 121
dc.citation.issueNumber 5
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.1002/2016JB012825
dc.type.publication publisher version
dc.citation.firstpage 3177
dc.citation.lastpage 3199


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