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采用构造岩石地层—沉积盆地—热水成矿流体及沉积组合—构造变形分析等方法 ,对秦岭造山带晚古生代伸展构造特征及意义进行了系统研究。结果表明 :秦岭造山带从加里东期末—海西期末一直处于 (剪切 )伸展体制下 ,形成一系列伸展构造 ,其伸展构造样式主要有同生断裂、剥离断层、陆表海域中的盆 -岛构造、地堑 -地垒式盆地构造、三级热水沉积成矿盆地 ,叠合沉积盆地内的伸展构造样式有褶叠层、分层剪切流变构造、滑塌同沉积构造、阶梯状同生断层等 ;这些伸展构造样式显示秦岭微板块是以伸展作用发生陆壳变形的 ,可称为秦岭型伸展构造样式 ;伸展构造是主要控矿构造 ,低序次同生断裂是含矿热水运移的通道 ,三级热水沉积成矿盆地是聚矿空间和热水沉积成矿场所 ,热水喷溢通道口及含矿热水沉积岩相是矿层赋存的部位。认为秦岭型伸展构造样式对研究区域成矿学和区内的矿产资源勘查与预测有重要的理论和应用价值。
By means of tectonic lithostratigraphy-sedimentary basin-hydrothermal fluid and sedimentary assemblage-tectonic deformation analysis, the late Paleozoic extensional tectonic characteristics and significance of the Qinling orogenic belt have been systematically studied. The results show that the Qinling orogenic belt has been under the (shear) extensional system from the end of Caledonian to the end of Hercynian, forming a series of extensional structures. The extensional tectonic styles of the Qinling orogenic belt mainly include synsegenenetic faults, pealed faults, basin- Island structure, graben-basement basin structure and tertiary hydrothermal sedimentary metallogenic basin. The extensional tectonic patterns in the superimposed sedimentary basins include pleat stratification, stratified shear rheological structure, syndepositional sedimentary structure, ladder Tectonic fault, etc; These extensional tectonic styles show that the Qinling microplate is deformed by the extension of the continental crust, which can be called the Qinling-type extensional tectonic style. The extensional structure is the main ore-controlling structure, and the low- Hot water migration channel, three hydrothermal sedimentary mineralization basin is a place for mineral deposits and hydrothermal deposits, hot water overflow channel mouth and ore-bearing hydrothermal sedimentary facies is the site of the deposit. It is considered that the Qinling-type extensional tectonic style has important theoretical and applied value for the study of regional mineralization and the exploration and prediction of mineral resources in the area.