Sedimentary processes and genetic mechanisms of the Late Triassic fine-grained gravity flows in Zhuoni area of West Qinling orogenic belt
SUN Haonan1, TAN Mingxuan1, FU Yilin1, CUI Haonan1,2, CHEN Mianpei1
1 College of Oceanography,Hohai University,Nanjing 210098,China; 2 Qingdao Institute of Marine Geology of China Geological Survey,Shandong Qingdao 266071,China
Abstract Fine-grained gravity flow deposists have some important implications for palaeogeography and palaeoclimate. The genetic mechanism and distribution of fine-grained sediments are crucial to palaeoenvironment reconstruction and stable carbon cyde, but their deposits processes are more complicated than that of coarse-grained gravity flow sediments. Detailed outcrop study shows that fine-grained gravity flow deposits are mainly devebpem in the Upper Triassic Kache Formation in the Zhuoni area of the West Qinling orogenic belt. Fine-grained gravity flow deposits of the Kache Formation in the study area can be divided into four lithofacies,corresponding to two deep-water sedimentary processes(i.e. fine-grained turbidity current and fine-grained hyperpycnal flow). Among them,fine-grained hyperpycnite is dominated by siltstone and argillaceous siltstone with suspended load(single-stage sedimentary thickness is 0.05-0.60 m),current ripple and argillaceous transitional ripple(type I)or current ripple and hummocky cross-stratification(type Ⅱ)appear alternately in the vertical direction,showing the overlapping characteristics of multi-stage positive rhythm and composite rhythm in the vertical direction. Fine-grained turbidites are also developed in the study area(single-stage sedimentary thickness is 0.05-0.2 m),which is generally characterized by Ta,Te or Ta,Tc of Bouma sequence. The two important sedimentary processes developed in the study area constitute a complex gravity flow sedimentary system,which has important implications for the sedimentology of fine-grained gravity flows in the shallow-water narrow continental shelf-upper slope of active continental margin of the Zhuoni area in the West Qinling orogenic belt.
Fund:; National Natural Science Foundation of China(No.42002117),Natural Science Foundation of Jiangsu Province(No. BK20200529)and Fundamental Research Funds for the Central Universities(Nos.2019B06314, B220202047)
Corresponding Authors:
TAN Mingxuan,born in 1990,is a lecturer at Hohai University. He is engaged in sedimentology and sequence stratigraphy. E-mail: mxtan@hhu.edu.cn.
About author: SUN Haonan,born in 1998,is a master degree candidate at Hohai University. He is engaged in sedimentology. E-mail: 211311040017@hhu.edu.cn.
Cite this article:
SUN Haonan,TAN Mingxuan,FU Yilin et al. Sedimentary processes and genetic mechanisms of the Late Triassic fine-grained gravity flows in Zhuoni area of West Qinling orogenic belt[J]. JOPC, 2023, 25(6): 1315-1329.
SUN Haonan,TAN Mingxuan,FU Yilin et al. Sedimentary processes and genetic mechanisms of the Late Triassic fine-grained gravity flows in Zhuoni area of West Qinling orogenic belt[J]. JOPC, 2023, 25(6): 1315-1329.
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