Experiments in study of the earth lower mantle chemical composition and evolution

Abstract

Discovery of diamonds with primary inclusions of ultrabasic ferropericlase and bridgmanite as well as basic magnesiowustite and stishovite became a prime familiarity with lower mantle minerals originated in multicomponent diamond-parental melts. The mineralogical similarity of diamond-hosted inclusions and experimental minerals of pyrolitic origin can be disseminated to the native lower mantle mineralogy. It is symptomatic that diamond-hosted ultrabasic and basic mineral assemblages were determined. These observations can indicate the compositional evolution of both diamond-parental melts and native lower mantle magmas. At the same time, physico-chemical mechanisms of ultrabasic-basic evolution as native magmas so diamond-producing melts may be revealed only with the use of physico-chemical experiments.