Figure 5
From: Bilateral geochemical asymmetry in the Karoo large igneous province
Distribution of Nb-undepleted and Nb-depleted Karoo CFBs relative to the sub-African large low-shear velocity province (LLSVP)15, the southern Gondwanan subduction zone58, and the Ferrar LIP. The surface projection of LLSVP boundary at 2800 km depth relative to reconstructed Gondwana is shown in red15 and possible extent of subduction-modified depleted upper mantle is schematically indicated with light green. The bilateral geochemical asymmetry in Karoo LIP is consistent with tapping of plume sources within and subduction-influenced upper mantle sources outside the realm of the African LLSVP. Ferrar LIP has been frequently associated with subduction-influenced upper mantle sources (e.g. ref.55) and is characterised by negative ΔNb values (Supplementary Fig. S5). The map was created using CorelDraw (https://www.coreldraw.com/). The overall Gondwana reconstruction and the outline of African LLSVP is based on Torsvik et al. (ref.15) and the outlines of continents were drawn using vector maps by FreeVectorMaps.com (http://freevectormaps.com) as models.
