The data available indicate the complex evolution of deformed peridotites of mantle xenoliths, the P–T parameters of which indicate that they are fragments of the metasomatized lower part of the cratonic lithosphere. The zoning established in garnets from xenoliths in kimberlite pipes is interpreted as a result of metasomatism that occurred shortly before xenoliths reached the surface. Metasomatic alterations in xenoliths of deformed harzburgites were manifested not only in the development of zoning of minerals. The study results show that there is a discrepancy between the data calculated based on the contents of incompatible elements in minerals of xenoliths and those obtained due to direct measurements of the bulk composition of xenoliths. To determine the balance of incompatible elements, we have carried out experiments on leaching xenoliths of deformed lherzolites from the Udachnaya kimberlite pipe. It was established that a significant part of LREEs in the studied xenoliths occurs in the intergranular space. The distribution pattern of incompatible elements and, in particular, the presence of a positive Eu anomaly indicate that the appearance of the intergranular component is not associated with contamination of xenoliths by the kimberlite melt. Quite a few xenoliths demonstrate a positive Eu anomaly, which indicates the influence of the subducted crustal component at one of the modification stages of xenoliths.

中文翻译：

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俯冲地壳参与亚库田含金刚石区次大陆地幔转化过程的地球化学证据

现有数据表明地幔包体变形橄榄岩的复杂演化，其 P-T 参数表明它们是克拉通岩石圈交代下部的碎片。在来自金伯利岩管中捕虏体的石榴石中建立的分区被解释为在捕虏体到达地表之前不久发生的交代作用的结果。变形菱镁矿捕虏体的交代蚀变不仅表现在矿物分带的发展中。研究结果表明，根据捕虏体矿物中不相容元素含量计算的数据与直接测量捕虏体整体成分获得的数据存在差异。为了确定不相容元素的平衡，我们进行了从 Udachnaya 金伯利岩管中浸出变形锂辉石捕虏体的实验。已确定所研究的捕虏体中的大部分轻稀土元素存在于粒间空间。不相容元素的分布模式，特别是 Eu 正异常的存在表明，晶间组分的出现与金伯利岩熔体对捕虏体的污染无关。相当多的捕虏体表现出Eu正异常，表明俯冲地壳成分在捕虏体的改造阶段之一的影响。不相容元素的分布模式，特别是 Eu 正异常的存在表明，晶间组分的出现与金伯利岩熔体对捕虏体的污染无关。相当多的捕虏体表现出Eu正异常，表明俯冲地壳成分在捕虏体的改造阶段之一的影响。不相容元素的分布模式，特别是 Eu 正异常的存在表明，晶间组分的出现与金伯利岩熔体对捕虏体的污染无关。相当多的捕虏体表现出Eu正异常，表明俯冲地壳成分在捕虏体的改造阶段之一的影响。