冀东-辽西南太古代花岗质岩石的形成与演化

THE FORMATION AND EVOLUTION OF ARCHAEAN GRANITOID ROCKS FROM EAST HEBEl AND SOUTHWEST LIAONING PROVINCES , CHINA

太古界迁西群、单塔子群变质火山沉积岩及其中的花岗质岩石是工作区最古老的岩石。花岗质岩石是混合岩化作用和深熔作用的产物。它们构成了一个变质岩—混合岩—花岗岩演化序列。

In east Hebei and south-west Liaoning Provinces the early Precambrian me-tamorphic rocks and granitoid rocks are widely disributred(Fig.l):The petrographical, chronological and geochemical study shows these meta-morphic rocks and granitoid rockswere products of'accumulate-recrystallization', metasomatism and anatexis following the regional metamorphism of granulite to high amphibolite facies held between 2500-2400 Ma. B.P.. They constituted a geneticsequence of metamorphic rocks, migmatites and granites.