The SW African volcanic rifted margin and the initiation of the Walvis Ridge, South Atlantic.

Elliott, G. M., Berndt, Christian and Parson, L. M. (2009) The SW African volcanic rifted margin and the initiation of the Walvis Ridge, South Atlantic. Marine Geophysical Research, 30 (3). pp. 207-214. DOI 10.1007/s11001-009-9077-x.

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Abstract

The continental margin of SW Africa is typical of a volcanic rifted margin associated with a hotspot trail characterized by a large volcanic ridge, the Walvis Ridge, defining the hotspot migration, and extensive extrusive volcanism that produced seaward-dipping reflectors (SDR). Previously unpublished seismic data show two significant anomalies of the SW African Margin when compared to other typical volcanic rifted margins: (1) Hyaloclastitic outer highs are rare, and (2) the SDR in the North dip towards the Walvis Ridge. We explain these anomalies by a major transform segment close to the centre of volcanism combined with pulsed volcanism. The Walvis Ridge represents an east-west striking extrusive centre which produced a SDR sequence. Following break-up the northern boundary of the Walvis Ridge became a left lateral transform fault. Our data support the idea that a transform fault system interacting with a ridge jump were responsible for the accretion of the São Paulo Plateau to the American plate.

Document Type: Article
Keywords: Volcanic rifted margins, Walvis Ridge, Outer highs, Seaward-dipping reflectors
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s11001-009-9077-x
ISSN: 0025-3235
Date Deposited: 14 Dec 2009 10:01
Last Modified: 22 Jun 2017 12:08
URI: http://oceanrep.geomar.de/id/eprint/1033

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