Fundamentals of the mantle carbonatite concept of diamond genesisстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 6 февраля 2018 г.
Аннотация:In the mantle carbonatite concept of diamond genesis, the data of a physicochemical experiment and analytical mineralogy of inclusions in diamond conform well and solutions to the following genetic problems are generalized: (1) we substantiate that upper mantle diamond-forming melts have peridotite/eclogite-carbonatite-carbon compositions, melts of the transition zone have (wadsleyite a dagger" ringwoodite)-majorite-stishovite-carbonatite-carbon compositions, and lower mantle melts have periclase/wustite-bridgmanite-Ca-perovskite-stishovite-carbonatite-carbon compositions; (2) we plot generalized diagrams of diamondforming media illustrating the variable compositions of growth melts of diamonds and paragenetic phases, their genetic relationships with mantle matter, and classification relationships between primary inclusions; (3) we study experimentally equilibrium diagrams of syngenesis of diamonds and primary inclusions characterizing the diamond nucleation and growth conditions and capture of paragenetic and xenogenic minerals; (4) we determine the fractional phase diagrams of syngenesis of diamonds and inclusions illustrating regularities in the ultrabasic-basic evolution and paragenetic transitions in diamond-forming systems of the upper and lower mantle. We obtain evidence for physicochemically similar melt-solution ways of diamond genesis at mantle depths with different mineral compositions.