Petrologic and thermal structure of the upper mantle beneath South Africa in the cretaceous
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Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: A study of mantle xenoliths from Parry Peninsula and Central Victoria Island
2018, Geochimica et Cosmochimica ActaCitation Excerpt :Identifying corresponding melts produced from the high degrees of melting is, however, problematic due to the overall paucity of exposed ultramafic magmatic rocks. While it has been widely accepted that there are thermal differences between cratonic and circum-cratonic lithosphere in the Kaapvaal craton and surrounding mobile belts (MacGregor, 1975; Boyd and Gurney, 1986), more recent work has shown that in fact the paleogeotherms derived from mantle xenoliths erupted through Paleoproterozoic terrains at the time of kimberlite eruption were broadly similar within the interior of the craton and around the margin of the craton (e.g., Boyd et al., 2004; Janney et al., 2010; Mather et al., 2011). The main difference in the xenolith-derived paleogeotherms in southern Africa seems to be recent evidence for thinning associated with a localized basal thermal disturbance that did not have time to re-equilibrate the shallower portions of the mantle geotherm.
Contrasting types of metasomatism in dunite, wehrlite and websterite xenoliths from Kimberley, South Africa
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