Paired EMI-HIMU hotspots in the South Atlantic—Starting plume heads trigger compositionally distinct secondary plumes?
Stephan Homrighausen, Kaj Hoernle, H. Zhou, Jörg Geldmacher, Jo‐Anne Wartho, Folkmar Hauff, Reinhard Werner, S. Jung, Jason Phipps Morgan
Abstract
Pb) composition, which is also observed at the EMI-type Shona hotspot track in the southernmost Atlantic. Whereas the primary EMI-type hotspots overlie the margin of the African LLSVP, the HIMU-type hotspots are located above a central portion of the African LLSVP, reflecting a large-scale geochemical zonation. We propose that extraction of large volumes of EMI-type mantle from the margin of the LLSVP by primary plume heads triggered upwelling of HIMU material from a more internal domain of the LLSVP, forming secondary plumes.
Topics & Concepts
Hotspot (geology)GeologyMantle plumePlumeMantle (geology)GeochemistryPaleontologyGeophysicsTectonicsGeographyLithosphereMeteorologyGeological and Geochemical Analysisearthquake and tectonic studiesGeology and Paleoclimatology Research