PETROGENESIS OF AUTOLITHS FROM KIMBERLITIC BRECCIAS IN THE V. GRIB PIPE (ARKHANGELSK DISTRICT)

Abstract

Kimberlitic diatremes are primarily composed of autolithic kimberlitic breccia. The name of this variety of kimberlitic rocks is related to the specific distribution of autoliths in the matrix. Autoliths are prominent fragments of kimberlitic breccia. The autoliths are also known as kimberlite-type inclusions in kimberlite, inclusions of kimberlites of earlier generations, fragments of magmatic kimberlite, pellets, and lapillies. The shape of these rocks can be both rounded (the shell smoothes out the irregular surface of the core) and irregular (with inlets and projections).