The Diamondiferous Behradih Kimberlite Pipe, Mainpur Kimberlite Field, Chhattisgarh, India: Reconnaissance Petrography and Geochemistry

Drill core from the diamondiferous Behradih pipe consists of pelletal-textured and olivine macrocrystic diatreme facies kimberlite variably affected by talc-serpentine-carbonate alteration. Crustal xenoliths of resorbed feldspar, syenite, granite, and basalt are common. The rocks have C.I. ≥ 1.6, 40-43 wt% SiO 2 , <5 wt% Al 2 O 3 , and Mg numbers of 83-87. The trace element composition is typical of kimberlitic rocks and excludes a lamproitic affinity.