晋蒙地体集宁群金红石成矿规律研究

Research on the Regularity of Rutile Mineralization in the Jining Rock Group of Jin Meng Terrain

根据晋蒙地体集宁群上部孔兹岩系和下部麻粒岩系的不整合构造接触,将本区划分为4个构造单元。通过对集宁群岩石学特征的分析及变质原岩的恢复,分析出其沉积环境具有差异。同时依据麻粒岩系形成于晚太古代而孔兹岩系形成于早元古代,对金红石的形成过程进行反演,推断其第一次主成矿期为阜平期,含矿岩层为集宁群下部麻粒岩系,右所堡组含石墨黑云角闪片麻岩。后经吕梁期地层重熔成矿物质迁移,最终在集宁群上部孔兹岩系下白窑组下段富集成矿,矿石岩性为含夕线石榴二长浅粒岩。

According to unconformity contact structure between Khondalite series and Granulited series, we divided the Jining rock group was divided into 4 tectonic units. Based on petrological features and restructuring of the protolith of Jining rock group, the differences in sedimentary environment was found. At the same time, given that Granulite series formed in the late archean,but Khondalite series formed in early proterozoic,it was infered that the first main metallogenic stage for rutile was in Fuping period. The ore strata was Jining rock group of Granulite series. You Suobao group contained gneiss of graphite, biotite, hornblende. Afterward, the Lvliang period, the above minerals transformed ore-forming mineral, which transferred and finally enriched in the Xia Baiyao group of the Khondalite series of Jining rock group. The lithology was two feldspar leptite containing sillimanite and garnet.