Abstract
On the Onega peninsula in the White Sea, eight explosion pipes have been discovered, consisting of alkaline basaltoid breccias. Composition of the breccias includes clinopyroxene (diopside-salite, 4 chemical analyses), olivine with 25-60% fayalite component, nephelinc, garnets (6 chemical analyses), mica, hornblende, picroilmenite (with 5.67% MgO), and other minerals. Among the predominant almandines, a trace of magnesian-chrome garnets has been identified, containing 43-63% of the pyrope component; diamonds have been identified in some of the pipes. From the chemical and mineralogical composition, the breccias of the Onega peninsula are similar to the alkaline basaltoids of Primor'ye. They are the deepest fades varieties of alkaline basaltoids. —Authors.
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