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We studied the petrography, mineralogy, thermobarometry and whole rock chemistry of 120 peridotite and pyroxenite xenoliths collected from the 156-138 Ma Chidliak kimberlite province (Southern Baffin Island). Xenoliths from pipes CH-1, -6, -7, and -44 are divided into two garnetbearing series, peridotites and wehrlites – olivine pyroxenites. The peridotites may contain spinel (3762 wt% Cr2O3), while wehrlites may contain picroilmenite. Peridotites and wehrlites show widely varying textures, from coarse to sheared. Xenoliths from the CH-6 pipe differ from xenoliths in other pipes in terms of their petrography and relative abundances of rock types. Textures indicating the late formation of garnet and clinopyroxene are present in all xenolith series, with the most common texture being garnet mantled by clinopyroxene. Pyroxenes are invariably rimmed by secondary calcic minerals, which appear as dark coronas. SEM observations identify these as 3-15 micron thick mantles of clinopyroxene (on orthopyroxene) and monticellite (on clinopyroxene).

Peridotite xenoliths of the Chidliak kimberlite province (NE Canada): the North Atlantic cratonic mantle with recent thermal and Ti-Na metasomatic disturbance