摘要
古构造-沉积环境作为喷流-沉积矿床重要控矿因素,引起国内外地质工作者的普遍关注。在内蒙古中部元古宙克拉通边缘裂陷槽内,古隆起两侧受深断裂控制的断陷盆地中,断续分布中元古界狼山群、渣尔泰群碳砂泥质-碳酸盐岩浅变质岩系,并产出一系列喷流-沉积型硫-多金属矿床。通过对该区裂陷槽、三级断陷盆地、盆地边缘断裂、同沉积期生长断裂和火成活动等古构造-沉积环境的分析,总结出内蒙中部元古宙海底喷流-沉积矿床受克拉通边缘裂陷槽-生长断裂-三级断陷盆地控制的古构造控矿模式。
Acting as controlls on formation of exhalation-sedimentary deposits,paleaotectono-sedimentary regime has become attracting more and more attentionfrom home and foreign geologists.That is the ease of the Neimenggu polymetallic oredeposits which are associatecl intermittently with the epimetamorphic,clastic-carbonate facies of Langshan and Zhaertai groups in some special fault basins.Thesetectonic depressions,usually located along both sides of a paleaolift in a rift zone nearthe Proterozoic Neimenggu craton,are controlled by deep faults.Apart from thedepressions.rift troughs,third order fault basins,synsedimentary faults and therelative igneous activities were also analysed paleaotectono-sedimentologically so as toestablish a paleaotectonic ore-controlling model.The model demonstrates that theNeimenggu sulphur-polymetallic ore deposits of their kinds have a close linkgenetically with all these paleaostructures,rift troughs along margins of cratons,growth faults and third order fault basins.
