Journal
MARINE GEOPHYSICAL RESEARCHES
Volume 30, Issue 3, Pages 207-214Publisher
SPRINGER
DOI: 10.1007/s11001-009-9077-x
Keywords
Volcanic rifted margins; Walvis Ridge; Outer highs; Seaward-dipping reflectors
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Funding
- NERC [soc010009] Funding Source: UKRI
- Natural Environment Research Council [soc010009] Funding Source: researchfish
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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 Previously unpublished seismic data show two significant anomalies of the SW African Margin when compared to other typical volcanic rifted margins: (1) Hyaloclastitic outer highs are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 So Paulo Plateau to the American plate.
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