摘要
As a form of carbon, COt<sub>2</sub> has been paid close attention to by geochemists who investigate features of fluids in the upper mantle or lower crust, since Dr. E. Roedderfound primary CO<sub>2</sub> inclusions in mantle minerals. CO<sub>2</sub> inclusions heterogeneously occur in ultramafic xenoliths from volcanic rocks, and CO<sub>2</sub> inclusion.fluids are almostly composed of pure COt<sub>2</sub>. In garnet lherzolite of Xilong of Zhejiang Province, for example, the early-stage formed CO<sub>2</sub> inclusions are mostly composed of pure CO<sub>2</sub>, but the late-stage CO<sub>2</sub> inclusions are composed mainly of CO<sub>2</sub>, and a little amount of H<sub>2</sub>O, CO, CH<sub>4</sub>, H<sub>2</sub>, SO<sub>2</sub>, H<sub>2</sub>S, etc.. The COt<sub>2</sub>-rich mantle fluids play an important role in geological processes operating in the mantle,so a stable isotopic investigation on CO<sub>2</sub> inclusions in the mantle xenoliths will contribute to understanding of origin and evolution of the
基金
Project supported by the National Natural Science Foundation of China.
