【摘要】 大青山逆冲断层带内热液脉体十分发育,按其产状可划分为充填脉和边缘脉。根据形成时间主要划分为3期:早期石英脉、中期石英脉和晚期方解石脉。早期石英脉中流体包裹体类型较为复杂,见有气液两相、含CO2三相、纯CO2及少量单液相等4种类型原生包裹体,分析表明流体主要来源于地壳深部或上地幔。中期石英脉中主要发育气液两相包裹体和少量单液相包裹体,流体主要来源于大气降水,并且有少量岩浆热液混入。晚期方解石脉内仅含有气液两相包裹体及少量的单液相包体,流体主要来源于层间建造水。根据逆冲变形事件期次、时间,结合热液脉体形成深度数据,确定了大青山逆冲推覆体系变形演化历史:印支期逆冲推覆事件发生在地壳7～8km深度,燕山中期逆冲推覆事件发生在3～6km范围内,而燕山晚期逆冲推覆事件发生近地表2km范围内。更多还原

【Abstract】 Fluid veins widely developed in the Daqingshan thrust-nappe,and can be divided into filled veins and edged veins according to their occurrences.According to their age,the formation of the fluid veins can be classified into three phases:the first phase quartz veins,the second phase quartz veins and the late phase calcite veins.The types of fluid inclusions in the first phase quartz veins is relatively complex,which contain two-phase aqueous,three-phase CO2-bearing,pure CO2 and single phase aqueous fluid inclusions,respectively;analytical data revealed that their forming solutions came from lower crust or upper mantle.The second phase quartz veins contain only two-phase aqueous and single phase aqueous fluid inclusions;fluids came from meteoric water which interfused with magmatic water.The late calcite veins contain two-phase aqueous and a few single phase aqueous fluid inclusions;fluids came from interlayer solutions.The evolution history of Daqingshan thrust-nappe system is determined according to the deformation phases,time and the depth data of those different kinds of veins.The thrusting of Indo-Chinese occurred at 7-8 km in the crust,the thrusting of middle Yanshanian occurred at 3-6 km in the crust and the thrusting of late Yanshanian within 2 km in the crust.更多还原