Figure 3: Whole rock geochemical characteristics of the Antarctic kimberlites.
From: The discovery of kimberlites in Antarctica extends the vast Gondwanan Cretaceous province
(a) Plot of whole-rock SiO2/MgO versus MgO/CaO for the samples 77081, 77063 and 77082 (red dots) compared with Mitchell’s6 field for representative, average kimberlites (dark grey shading), for extreme kimberlite compositions (light grey shading) and the UML from nearby Beaver Lake (Jetty Peninsula)12 (blue diamonds). (b) Primitive-mantle normalized13, extended trace element plot of the three nPCM kimberlites (77081, black circles; 77063, white circles; and 77082, grey circles) compared with the range of values from a representative suite of 167 kimberlites from Africa (pink), Canada (yellow), Greenland (grey), India (indigo) and Siberia (green)43,44,45,46,47,48,49,50,51.
