【摘要】 基于塔里木盆地库鲁克塔格露头区却尔却克山、元宝山和南雅尔当山中—上奥陶统宏观沉积特征分析,结合钻井、地震资料分析,对盆地东北部巨厚的中—上奥陶统碎屑岩沉积物源及其构造背景相关性进行了探讨。中—上奥陶统却尔却克组发育复理石建造,综合重矿物组合、矿物成熟度参数、砂岩主、微量元素、稀土元素和阴极发光等提供的物源信息,反映物源区主要为大陆岛弧和活动大陆边缘构造背景。却尔却克组沉积早期物源区主要来自北部古陆,主要为酸性花岗岩类和变质岩类,却尔却克组沉积中后期,除来自北部的物源外,还有来自东南部阿尔金造山带的火山碎屑物质的加入。中—上奥陶统沉积物源分析为塔里木盆地东北部地区中晚奥陶世构造隆升与沉积充填关系研究提供重要依据。更多还原

【Abstract】 Based on sedimentary structure and sampling of the Middle-Upper Ordovician in Queerqueke,Yuanbaoshan and Nanyaerdang profiles in Quruqtagh area,the provenance and tectonic setting of the MiddleUpper Ordovician are studied,combined with the well and seismic data.The Queerquek Formation in the Middle-Upper Ordovician is thought to be the flysch deposition.According to the sedimentary structure,heavy mineral assemblage,mineralogical maturity,cathode luminescence and characteristics of major elements,trace elements and rare earth elements,the tectonic setting of the Middle-Upper Ordovician is the continental island arc and active continental margin.In the early sedimentary stage,the provenance of Queerquek Formation came from the north paleo-land mass,which was composed of granitoid and metamorphic rocks;in the middlelate sedimentary stage,some pyroclastic from the Altyn orogenic belt turned to be a new provenance.The analysis of the provenance of the Middle-Upper Ordovician provides a basis for studying the relationship between the tectonic uplift and the sedimentary filling,and for predicting the distribution of tight sandstone of the MiddleLate Ordovician.更多还原