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

耳朵- 0001945 t。Gasparik， M. J. Drake， J. B. Parise：深部地幔钻石包裹体起源的合作研究在CSEDI的合作研究项目中，我们计划继续利用包裹体的微量元素和微量元素含量对深部地幔钻石包裹体起源进行实验研究。观察到的元素含量将在高压实验中与这些组合中的相关系和元素分配相匹配，这些组合包括金刚石中发现的包裹体中的相。我们将完成对CaSiO3和（Mg,Fe）O组成的包裹体起源的研究，然后将研究扩展到大多数石榴石包裹体的起源。三种包裹体的微量元素和微量元素含量均可与实验相匹配。这些元素在各种组合中的相之间的分配，包括所选包裹体的类似物和作为包裹体观察到的其他相，是在一系列实验压力、温度和组成中确定的，直到发现包裹体和类似相的微量元素含量之间的密切匹配。共存相的组成提供了包裹体来源的原始组合信息，从而限制了源区的矿物和化学组成以及p - t起源条件。

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.