Tracking the Tristan-Gough mantle plume using discrete chains of intraplate volcanic centers buried in the Walvis Ridge


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Wilfried.Jokat [ at ] awi.de

Abstract

Resolving the age-distance relation of volcanism along the Walvis Ridge (southern Atlantic Ocean) is essential to understanding relative motion between the African plate and the Tristan-Gough mantle plume since the opening of the South Atlantic. However, tracking the location of the Tristan-Gough plume might not be practicable if most of the complex morphology of the massive Walvis Ridge is related to the proximity of the South Atlantic mid-ocean ridge. Here we use new 40Ar/39Ar basement ages for the Tristan- Gough hotspot track, together with information about morphology and crustal structure from new swath maps and seismic profiles, to infer that separated age-progressive intraplate segments track the location of the Tristan-Gough mantle plume. The apparent continuity of the inferred age-distance relation between widely separated age-progressive segments implies a connection to a stable or constantly moving source in the mantle.



Item Type
Article
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Primary Division
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Publication Status
Published
Eprint ID
38530
DOI 10.1130/G36767.1

Cite as
O'Connor, J. and Jokat, W. (2015): Tracking the Tristan-Gough mantle plume using discrete chains of intraplate volcanic centers buried in the Walvis Ridge , Geology, 43 (8), pp. 715-718 . doi: 10.1130/G36767.1


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Geographical region

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ANT > XXIII > 5


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