Abstract:

The significances of the mantle fluid in geological processes have received  more attention day by day, and became a frontier project in geosciences. This paper provides detailed petrographic, mineralogic and mineralchemical data of the   segregation with various forms in kamafugites from Western Qinling, Gansu Province, and probes into the nature of these segregations, the composition of the mantle fluid and generating mechanism of these  segregations. The studies show that these  segregations are records of the activities of asthenospheric  mantle fluid. The generating mechanism of the  segregation may be related to differentiation of the primary kamafugite magma(especially liquid immiscibility), combined with magma extraction and dynamic melting at the conditions of  the magmatism opened to  asthenosphere and  the upwelling of the asthenosphere.

Key words: globule segregation, kamafugite, Cenozoic, mantle fluid, Western Qinling