Okay Shadera heres what I think applies to what you gleaned from your sources. First a review kimberlite an ultra-mafic rock is defined as follows;An alkalic peridotite containing abundant phenocrysts of olivine(commonly altered to serpentine or carbonate) and phlogopite (commonly chloritized), in a fine grained groundmass of calcite, second generation olivine,and phlogopite; with accessory ilmenite,serpentine,chloite,magnetite, and perovskite.
Another definition worth noting in your post is for a carbonatite; A carbonate rock of apparent magmatic origin, GENERALLY ASSOCIATED WITH KIMBERLITES and alkalic rocks.
I am assuming the carbonitized is what you heard and not carboniferous because when someone refers to the carboniferous,they are refering to a time period represented by the Mississippian and Pennsylvanian periods combined and the corresponding system of rocks which in the case of this area of the craton probably does not apply. Still everything you have provided in this posts and previous posts points to the likelihood that a kimberlite pipe has been located by NSDM.
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