AbundantĬhemical and isotopic data support the concept that kimberlites originate from a source region in the mantle Phanerozoic eons, but they are restricted to Precambrian shield areas and surrounding fold belts. Kimberlites erupted throughout most or all of the Proterozoic and The spatial and temporal distributions of kimberlites and alkali basalts provide information on the mechanismsīy which these important rocks originate. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages. Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.
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