Somerset Kimberlites
Emplacement ages range from 105 to 88Ma
Bodies are alinged along a variety of basement and host rock structures - dominantly NW-SE, NE-SW (bsmt diabase) ; N-S (bsmt gneissosity)
xenolith studies have established the base of the lithosphere at 170 km, and a geotherm of 44mW/m2 (Nikos and Batty)
Re-Os dating of xenoliths indicates that sampled lithosphere has Archean dates
some xenoliths were derived from within the diamond stability window