Sequence stratigraphic subdivision and correlation of the Ediacaran (Sinian)Doushantuo Formation of Yangtze Plate,South China
Yang Aihua1, Zhu Maoyan2, Zhang Junming2, Zhao Fangchen2, Lü Miao2
1 State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, Jiangsu
2 LPS, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, Jiangsu
Based on field investigations and detailed analyses of lithofacies of the 18 representative sections from the various sedimentary settings,three second-order eustatic sea level changes and three sequence bottom boundaries are identified within the Ediacaran Doushantuo Formation of the Yangtze Plate,South China. The major sequence boundary(SB1)at the base of the Doushantuo Formation which is marked by the interface between the Cryogenian Nantuo diamictites and overlaying cap dolomite. The two major sequence boundaries(SB2 and SB3) are marked by the karstic surfaces are recognizable within the middle and upper portion of the Doushantuo successions in a shallow-water sedimentary setting. But these unconformities are missing in the deeper water setting,the corresponding sequence boundaries(SB2 and SB3)within the Doushantuo successions in the deeper water setting are represented by abrupt shift of lithofacies stacking patterns. The results demonstrate that the Doushantuo successions consist of two and half second-order sequences or super sequences with time span of ca. 35 Ma for SS1(635-600 Ma)and SS2(600-565 Ma),and ca. 14 Ma for SS3-TST(565-551 Ma). The cap dolomite distributed widely at the bottom of Doushantuo Formation and the maximum flooding surfaces in the sequences are important markers for stratigraphic correlation. Present sequence stratigraphic framework of the Doushantuo Formation can be used for stratigraphic correlation of the Doushantuo successions from the shallow-water facies to the deep-water facies of the Yangtze Plate. Meanwhile,our results indicate that the four members subdivision of the Doushantuo Formation based on its type succession in the Yangtze Gorges area is not practical for the whole Yangtze Plate and generally leads to incorrect stratigraphic correlations and confusions of the Doushantuo successions outside the Yangtze Gorges area. Therefore,it is suggested here that subdivision and correlation of the Doushantuo successions should be based on the second-order sequence stratigraphy together with carbon isotpe chemostratigraphy and biostratigraphy. The new stratigraphy framework of Doushantuo Formation will be a good basis for the palaeogeography evolution research and high-precision lithofacies palaeogeographic mapping.
About author: Yang Aihua, born in 1976, obtained her Ph.D. degree from Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences in 2006. Now she is an associate professor in Nanjing University, and is mainly engaged in palaeontology, stratigraphy and palaeobiogeography. E-mail: ahyang@nju.edu.cn.
Cite this article:
Yang Aihua,Zhu Maoyan,Zhang Junming et al. Sequence stratigraphic subdivision and correlation of the Ediacaran (Sinian)Doushantuo Formation of Yangtze Plate,South China[J]. JOPC, 2015, 17(1): 1-20.
Yang Aihua,Zhu Maoyan,Zhang Junming et al. Sequence stratigraphic subdivision and correlation of the Ediacaran (Sinian)Doushantuo Formation of Yangtze Plate,South China[J]. JOPC, 2015, 17(1): 1-20.
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