双沟蛇绿岩中地幔交代作用的质子微探针研究

A Proton Microprobe Study on Mantle Metasomatism for the Shuanggou Ophiolite

采用空间分辨率高和高灵敏度的质子微探针和微束ＰＩＸＥ技术，测定地幔流体结晶后各组成矿物的微量元素组成及其在不同矿物内的分布状况。对云南双沟蛇绿岩中存在的地幔交代作用进行的研究结果表明，由地幔流体结晶而成的矿物（单斜辉石、尖晶石、石榴石、绿泥石），其微量元素组成与分布特征受地幔交代作用过程的控制。

A study on trace element composition and distribution in minerals crystallized from mantle fluids based on the phenomenon of metasomatism in the Shuanggou ophiolite is reported in this paper. Proton microprobe and micro PIXE technique with high spatial resolution and high detection sensitivity are used in the study. The results indicate that trace element compositon and distribution in minerals(monoclinic pyroxene, spinel, garnet and chlorite) crystallized from mantle fluids are controlled by mantle metasomatism processes. It is of great importance in further study of the geochemical behavior of trace elements in the Shuanggou mantle metasomatism processes.