Tracking the Tristan-Gough mantle plume using discrete chains of intraplate volcanic centers buried in the Walvis Ridge
2015
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.
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