松辽盆地以东地区橄榄岩包体原位地球化学特征及深部碳酸盐熔体交代作用

俯冲板片-地幔相互作用是造成岩石圈地幔不均一性的重要过程，也是研究现代板块构造理论和深部动力学的前沿科学问题。但是，在大地幔楔系统中，如西太平洋-中国东部，俯冲板片如何影响上覆大陆岩石圈地幔的物理化学性质，特别是再循环碳酸盐在壳幔相互作用中的贡献，目前尚不清楚。中国东北松辽盆地以东地区存在丰富的地幔包体，为我们研究西太平洋俯冲板片-地幔相互作用及其在东亚大陆边缘演化过程中的作用提供了难得的窗口。本项目拟利用LA-ICP-MS和LA-MC-ICP-MS原位分析方法，对宽甸、蛟河、永安等松辽盆地以东地区的地幔橄榄岩进行矿物原位微区元素含量和单斜辉石Sr同位素组成研究，以示踪不同来源碳酸盐熔体对松辽盆地以东岩石圈地幔的改造程度和范围，从而进一步理解大地幔楔系统中地幔深部碳酸盐再循环在壳幔相互作用及其演化过程中的重要作用。

Subducted slab-mantle interaction is one of the most fundamental issues of the modern theory of plate tectonics and geodynamics of the deep Earth and is the key to better understand the heterogeneity of lithospheric mantle. However, how subducted slabs in big mantle wedge systems, such as the western Pacific plate-eastern China, affect chemical and physical conditions of the overlying sub-continental lithospheric mantle, especially the significance of deep carbonate recycling, is in hot debates and unclear. Nevertheless, the abundant peridotite xenoliths from the eastern Songliao Basin in northeast China provide a unique opportunity to investigate the interaction between subducted slab and mantle and its role in the evolution of the east Asian continental margin. This project will focus on in-situ chemical and Sr isotopic compositions of minerals in mantle peridotites from Kuandian, Jiaohe and Yong'an in the east of Songliao Basin, China, to trace carbonatite metasomatism and its effect on the modification of the lithospheric mantle beneath the northeastern China, and promote our understanding of the role of deep carbonate recycling in crust-mantle interaction of big mantle wedge systems.