Abstract Based on full investigation of previous research,we carefully determined the types of the sedimentary facies of the Qingbaikou system in the Qingbaikou area,Jingxi Depression,and established its sedimentary facies model,by analysis of the field measured data, thin sections, as well as their lithologic characteristics and sedimentary structures. The Qingbaikou system consists of Xiamaling Formation,Longshan Formation and Jing'eryu Formation from bottom to top. The results show that the Xiamaling Formation is mainly a set of relatively deep shelf deposits of the terrigenous clastic shallow-marine depositional system,and sandy debris flow deposits are first found; the Longshan Formation is a huge set of nearshore and foreshore sandy deposits of the terrigenous clastic shore depositional system,which is controlled by the modification of waves and longshore currents;and the Jing'eryu Formation consists of a set of typically clastic-carbonate mixed tidal flat deposits,of which the upper and lower part are mainly composed of purple mudstones and the middle part is a huge set of thick carbonate,due to arid,restricted and low-energy environment related to the palaeolatitudinal variation. The clastic deposits,related to terrigenous inputs in Longshan Formation,turned into endogenous clear-water carbonate deposits in Jing'eryu Formation,which suggests that the palaeogeographic environment gradually stabilized.
Fund:[Financially supported by the National Basic Research Development Plan “973”Project(No.2006CB202300)]
Corresponding Authors:
Jin Zhen-Kui,born in 1963,is a professor and Ph.D. supervisor.He is mainly engaged in sedimentology, sequence stratigraphy and reservoir prediction. E-mail: jinzhenkui@188.com.
About author: Guo Qi-Heng,born in 1994,is a candidate for master's degree in China University of Petroleum(Beijing). He is mainly engaged in researches on sedimentology,sequence stratigraphy and reservoir geology. E-mail: 1974735970@qq.com.
Cite this article:
Guo Qi-Heng,Jin Zhen-Kui,Zhu Xiao-Er et al. Sedimentary facies evolution of the Neoproterozoic in Qingbaikou area of Jingxi Depression, Yanshan region[J]. JOPC, 2019, 21(3): 422-430.
Guo Qi-Heng,Jin Zhen-Kui,Zhu Xiao-Er et al. Sedimentary facies evolution of the Neoproterozoic in Qingbaikou area of Jingxi Depression, Yanshan region[J]. JOPC, 2019, 21(3): 422-430.
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