Petrogenesis of Mantle Eclogites from Yakutia, Siberia

这是在古克拉通地幔演化和地球早期演化的框架内研究地幔榴辉岩的岩石成因及其侵位动力学的建议。在这项拟议的研究中，将继续进行关于两个地点的工作，并将研究扩展到西伯利亚雅库特的另外两个金伯利岩地区。据推测，这些矿点在地幔的大范围深度进行了采样，并且位于与克拉通边缘不同的距离。这项拟议的研究将继续美国国家科学基金会赞助的美俄合作研究计划，以及田纳西大学的L.A.泰勒教授和俄罗斯科学院西伯利亚分院的N.V.索博列夫院士之间的协议。这一多国方法将包括对西伯利亚前述金伯利岩管中选定的包体进行岩石学和矿物化学分析。这项研究将包括美国和俄罗斯之间的科学人员交流。将对钻石中的矿物分离物进行O、Rb-SR、Sm-ND和Re-Os分析，以确定地幔和地壳储集层在榴辉岩成因中的作用。一个新的和令人兴奋的方向涉及研究在几个雅库特钻石中发现的榴辉岩矿物的主要和微量元素化学。这些结果将被用来获得更完整、更全面的地幔榴辉岩形成、古老克拉通的结构和演化以及早期地球的分化的图景。

This is a proposal to study the petrogenesis of mantle eclogites and the dynamics of their emplacement within the framework of the evolution of ancient sub-cratonic mantle and the early evolution of the Earth. In this proposed research, work concerning two localities will continue, and study extended to two additional kimberlite localities in Yakutia, Siberia. These occurrences are postulated to have sampled a wide range of depths in the mantle and are situated at varying distances from the craton edge. The proposed study would continue the NSF-sponsored US/Russia Cooperative Research Program and agreement between Prof. L.A. Taylor of the University of Tennessee and Academician N.V. Sobolev of the Siberian Branch of the Russian Academy of Sciences. This multi-national approach will include petrographic and mineral-chemical analyses of selected xenoliths from the aforementioned kimberlite pipes in Siberia. This study will include an exchange of scientific personnel between the United States and Russia. O, Rb-Sr, Sm-Nd, and Re-Os analyses will be performed on mineral separates in diamonds to determine the involvement of mantle and crustal reservoirs in eclogite genesis. A new and exciting direction involves a study of major- and trace- element chemistry of eclogite minerals found in several of the Yakutian diamonds. The results will be used to achieve a more complete and global picture of the formation of mantle eclogites, the structure and evolution of old cratons, and the differentiation of the early Earth.