黑龙江盘古-碧水韧性剪切带中段构造地球化学特征

盘古-碧水韧性剪切带中段糜棱岩的叠加强度和质量平衡分析表明:剪切带在变形过程中组分发生了显著的交换。糜棱岩类总体CaO、K₂O、SiO₂大量带入,TiO₂、MnO、FeO是带出的。随着糜棱岩化程度的提高,SiO₂、K₂O、MnO明显带入,CaO少量带出。以Al₂O₃守恒为限制条件,整个剪切带质量和体积增加了16.87%。大规模的物质带入带出发生在糜棱岩阶段。

TECTONOGEOCHEMICAL FEATURES OF MIDDLE PART OF PANGU-BISHUI DUCTILE SHEAR ZONE IN HEILONGJIANG PROVINCE

The results of overlapping intensities and mass balance analysis on the mylonites from the middle part of the Pangu Bishui ductile shear zone demonstrate that the components of shear zone have distinctly exchange in the deformation process. A large introduction of CaO, K 2O, SiO 2 and obvious removal of TiO 2, MnO, FeO in the mylonites can be observed. With advance of the mylonitization, an obvious introduction of SiO 2, K 2O, MnO and a spot of removal of CaO have occurred in the mylonites. To be restricted by Al 2O 3 which kept at a constant, about 16.87% of mass and volume may have increased for the entire shear zone, and the introduction and removal of matter occurred principally in the stage of mylonitization.