CSEDI Collaborative Research: of the Origin of Inclusions in Diamonds from the Deep Mantle

EAR-0001945T。Gasparik，M.J.Drake，J.B.Parise：深部地幔钻石中包裹体起源的合作研究在这个CSEDI合作研究项目中，我们计划继续利用包裹体中的微量和微量元素含量对来自深部地幔的钻石中包裹体的起源进行实验研究。观察到的元素含量将在高压实验中进行匹配，以确定包含作为钻石中包裹体的相的那些组合中的元素分配。我们将完成对包裹体成因的CaSiO_3和(Mg，Fe)O组分的研究，并将研究扩展到主要石榴石包裹体的成因。三种夹杂物均可获得实验拟配的微量元素和微量元素含量。在一定的实验压力、温度和成分范围内，确定了这些元素在不同组合中的相之间的分配，包括所选包裹体的类似物和观察为包裹体的其他相，直到发现包裹体和类似相的元素和微量元素含量密切匹配。共存相的组成提供了有关包裹体来源的原始组合的信息，从而限制了源区的矿物和化学成分以及成因的p-T条件。

EAR-0001945T. Gasparik, M. J. Drake, J. B. Parise: Collaborative Research of theOrigin of Inclusions in Diamonds From the Deep MantleIn this CSEDI collaborative research project, we plan to continue ourexperimental investigation of the origin of inclusions in diamonds from thedeep mantle using the minor and trace element contents of the inclusions.Observed element contents will be matched in high-pressure experiments onphase relations and element partitioning in those assemblages which includephases found as inclusions in diamonds. We will complete our ongoingstudies of the origin of inclusions with CaSiO3 and (Mg,Fe)O compositions,and then extend the investigation to the origin of majoritic garnetinclusions. The minor and trace element contents to be matched byexperiments are available for all three kinds of inclusions. Partitioningof these elements among phases in various assemblages, which includeanalogues of the selected inclusions and other phases observed asinclusions, is determined over a range of experimental pressures,temperatures and compositions, until a close match is found between theminor and trace element contents of the inclusions and of the analoguephases. The compositions of the coexisting phases then provide informationabout the original assemblage, from which the inclusion came, and thusconstrain the mineral and chemical composition of the source region and theP-T conditions of origin.