Abstract：
:Southern Africa is characterised by unusually elevated topography and abnormal heat flow. This can be explained by thermal perturbation of the mantle, but the origin of this is unclear. Geophysics has not detected a thermal anomaly in the upper mantle and there is no geochemical evidence of an asthenosphere mantle contribution to the Cenozoic volcanic record of the region. Here we show that natural CO2 seeps along the Ntlakwe-Bongwan fault within KwaZulu-Natal, South Africa, have C-He isotope systematics that support an origin from degassing mantle melts. Neon isotopes indicate that the melts originate from a deep mantle source that is similar to the mantle plume beneath Réunion, rather than the convecting upper mantle or sub-continental lithosphere. This confirms the existence of the Quathlamba mantle plume and importantly provides the first evidence in support of upwelling deep mantle beneath Southern Africa, helping to explain the regions elevation and abnormal heat flow.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Gilfillan SMV,Györe D,Flude S,Johnson G,Bond CE,Hicks N,Lister R,Jones DG,Kremer Y,Haszeldine RS,Stuart FMdoi
10.1038/s41467-019-12944-6subject
Has Abstractpub_date
2019-11-05 00:00:00pages
5028issue
1issn
2041-1723pii
10.1038/s41467-019-12944-6journal_volume
10pub_type
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