崤山地区太古代变质花岗岩地质地球化学特征

GEO GEOCHEMICAL CHARACTERISTICS OF THE ARCHAEOZOIC METAMORPHIC GRANITE IN XIAOSHAN MTS.REGION

崤山地区原“太华群”由１５％的变质表壳岩和８５％的变质花岗岩组成。变质花岗岩的主要岩石类型有：石英闪长岩、英云闪长岩、奥长花岗岩、花岗闪长岩。通过对变质花岗岩的地质、地球化学研究表明，崤山地区太古代变质花岗岩与国内外其他地区的ＴＴＧ岩系类似。根据野外接触关系和一组锆石Ｐｂ－Ｐｂ蒸发年龄（２４５１Ｍａ），确定其成岩时代为太古代。

The original “Taihua Group” in the Xiaoshan Mts. region was formed by the metamorphic supracrustal rocks making 15 per cent of the total content and metamorphic granite making 85 per cent of the total content. The main rock types of metamorphic granite are: quartz diorite, tonalite, trondhjemite and granodiorite. To pass through the systematic geologic geochemical study for the metamorphic granite, the authors considered that the Archaeozoic metamorphic granite in the Xiaoshan Mts. region is similar to the TTG rock series of other areas at home and abroad. According to the relation of contact in the field and Pb Pb evaporation age of a set of zircon(2451 Ma), its diagenetic age can been ascertained the Archaeozoic Era.