Abstract
Abundances of fluorine and chlorine in thirty-two kimberlites and six ultrabasic inclusions from India, Greenland and Africa have been determined and shown to be held by apatite (mainly F) and phlogopite (mainly Cl). Compared with other ultrabasic rocks, kimberlites show higher level of fluorine. Secondary alteration depletes chlorine more than fluorine. In the Indian kimberlites, the variation of element abundance is related to geographical regions. A significant positive correlation exists between F and P and a fractionation index suggesting that the halogens, especially F, represent differing degrees of evolution of the kimberlitic magma. This possibly reflects regional variation in levels of “incompatible” elements within the mantle dependent upon cratonic ages.
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