金伯利岩所携带的部分剪切石榴橄榄岩通常具有很高的平衡温度和饱满的化学成分，从而被认为来源于克拉通下方的岩石圈-软流圈边界层。目前对于该边界层的成因还存在较大的争议，即究竟是代表从软流圈增生到岩石圈底界的新生地幔，还是代表遭受熔体交代作用而发生强烈变形的古老克拉通地幔。本研究选择西伯利亚Udachnaya金伯利岩所携带的剪切石榴橄榄岩作为研究对象，通过系统的岩石与地球化学分析，研究岩石圈-软流圈边界层的成因。利用矿物及全岩的主、微量元素成分揭示剪切石榴橄榄岩所经历的部分熔融与熔体交代作用。通过全岩Re-Os同位素确定剪切石榴橄榄岩的年龄,并讨论熔体交代作用对于全岩Re-Os同位素的影响。通过测定名义无水矿物的水含量来推测岩石圈-软流圈边界层的水含量。在此基础之上，探讨岩石圈-软流圈边界层对于克拉通地幔稳定的作用。

A part of sheared garnet peridotites entrained in kimberlties have high equilibrium temperatures and fertile chemical compositions, which have been explained as stemming from the lithosphere-asthenosphere boundary (LAB). Currently, it is still highly debated over whether the LAB represents the juvenile mantle accreted from the asthenosphere to the cratonic lithospheric roots or ancient lithospheric mantle that has been highly deformed resulting from melt metasomatism. We will select sheared garnet peridotites entrained in the Udachnaya kimberlites from the Siberian Craton to study the genesis of the LAB through detailed petrological and geochemical analyses. Partial melting and metasomatic processes experienced by the sheared garnet peridotites will be discussed through the mineral major and trace elements. Ages of the garnet peridotites will be constrained through whole-rock Re-Os isotopes. Meanwhile, effects of metasomatism on the whole-rock Re-Os isotopes will also be evaluated. Water contents of the nominally anhydrous minerals (NAMs) will be analyzed by FTIR method to constrain the water contents of the LAB. Finally, the role of the LAB played in stabilizing the cratonic mantle will be discussed.