火成岩中的麻粒岩相捕虏体研究新进展及其对认识地壳生长与演化的意义

火成岩中的麻粒岩相捕虏体主要分为基性熔体捕虏体，酸性变质火成岩捕虏体与变质沉积岩捕虏体。麻粒岩相捕虏体的锆石离子探针年龄与上地壳花岗岩的侵位年龄，造山运动时代基本一致。基性熔体的下垫作用是地壳生长的一种重要方式，并且代表了一种有效的幔向壳的物质与能量迁移。地下壳部分熔与麻粒岩相变质作用是壳内分异的重要途径。

PROGRESS IN THE STUDY OF GRANULITIC-FACIES XENOLITHS SCAVENGED IN IGNEOUS ROCKS AND ITS IMPLICATIONS FOR CRUSTAL GROWTH AND EVOLUTION

Granulitic-facies xenoliths,scavenged in igneous rocks,comprise mainly of basicmelt xenoliths,acidic meta-igneous xenoliths and metasedimentary xenoliths.The xenoliths have been dated using zircon microprobe dating method,suggesting that the xenoliths were formed approximately simultaneously with granite emplacement and orogeny in the upper crust.Underplating of basic melt beneath the crust is one of the most important patterns of crust growth and represents an effective material and energy transfer from the mantle to the crust.Partial fusion and granulitic facies metamorphism in the lower crust are important models for intracrustal differentiation.