Implication of iron rich heavy minerals in Quaternary sediments in Yichang area of Hubei Province for cutting through time of Three Gorges
You Wen-Zhi1, Xiang Fang2,3, Yang Kun-Mei1, Jiang Yue-Hua4, Yu Xian-Tao2, Li Lei1
1 College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China; 2 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China; 3 State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China; 4 Nanjing Geological Survey Center,China Geological Survey,Nanjing 210016,China
Abstract：The evolution of the Three Gorges has been the focus of debate in the field of geosciences. In recent years,many scholars have successfully analyzed the provenance of the Yangtze River through the isotope composition and trace elements in heavy minerals such as zircon,garnet and amphibole. However,the single-grain iron-rich heavy minerals are seldom used as provenance indicators and applied in the determination of the cutting-through time of the Three Gorges. Therefore,in this paper,the chemical properties and morphologic analysis of iron-rich heavy minerals in Quaternary sediments of Yichang area were analyzed by electron probe,scanning electron microscope and energy disperse spectroscopy,which were compared with the analytical results of possible provenance samples. The evolution process of provenance and the cutting-through time of the Three Gorges were analyzed based on the occurrence of materials in Yichang area that may belong to the west of the Three Gorges. The results show that the source rocks of the iron-rich heavy minerals in the Quaternary sediments in Yichang are mainly from the Panzhihua vanadium titanomagnetite,Emeishan basalt that are located to the west of the Three Gorges and Huangling granite located to the east of the Three Gorges. After the deposition of the Shanxiyao Formation,the provenance of the Quaternary sediments in Yichang area changed obviously,and the material that belong to the west of the Three Gorges appeared in this area,which indicates that the Three Gorges was cutted-through. Combined with ESR dating data and previous studies,it can be assumed that the cutting-through time of the Three Gorges occurred in 0.75-0.73Ma B.P..
You Wen-Zhi,Xiang Fang,Yang Kun-Mei et al. Implication of iron rich heavy minerals in Quaternary sediments in Yichang area of Hubei Province for cutting through time of Three Gorges[J]. JOPC, 2021, 23(4): 855-870.
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