皖西霍丘变质岩系特征及原岩恢复

概况皖西晚太古代霍丘群变质岩系,分布于中朝准地台南缘,地表全为第四系所覆盖。自航磁发现铁矿以来,除三三七地质队进行大量地质勘探工作外,近年来有不少单位在此进行过研究工作,积累了丰富的地质资料。1982年,我所铁矿组对变质地层重新进

Characteristics of the Metamorphic Rock! Series of the Huoqiu Group in Western Anhui and its Protolith Nature

The late Archean I}iuoqiu Group metamorphic rock series is distributed on the southern margin of North China platform. The lower part of tms group consists cnieriy or mtc:zoeaaea plagioclase gneiss, leptite, and amphibolite. The upper part is composed mainly of interbe- dded and plagioclase schists and-Ieptite intercalated with amphibolite and magnetite-quaa-tzite, and uppormost containing lenticular marble at its top. These rocks had undergone metamorphism of the amphibolite facies. The upper strata show rhythmic stratification and relicts of volcanic tex- ture were found in the amphibolile and leptite. Based on petrological, petrochemical and trace element studies the original rocks of this group are considered to belong to intermediate-basic volcano- sedimentary rocks.