Neoproterozoic Stratigraphy, Depositional Environments and Hydrocarbon Source-Reservoir-Seal Bed Assemblage in South China

Cryogenian and Ediacaran integrative stratigraphy, biotas, and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

“…The investigation and correlation of the Cryogenian and Ediacaran rocks in the Ganluo region, southwestern Sichuan, began in the 1950s (Southwestern Institute of Geological Science, 1978;Yin, 1980). This sequence includes the Lieguliu, Guanyinya, and Dengying (Hongchunping) formations in ascending order (Zhu et al, 2016;Zhou et al, 2021; Figure 2, Profile 2). The Lieguliu Formation disconformably overlies the Kaijianqiao Formation.…”

“…The first stage is represented by the deposition of the "cap carbonate" and the second stage represents the flourishing of eukaryotic microorganisms that are dominated by the large acanthomorphic acritarchs. Further subdivisions of the Ediacaran System were also proposed based on the Ediacaran succession in South China (e.g., Zhu et al, 2007aZhu et al, , 2016Zhu et al, , 2022Liu et al, 2012Liu et al, , 2016Zhou et al, 2019b). However, a consensus on the subdivision has not yet been reached.…”

“…The Cryogenian and Ediacaran strata in Chengjiang (eastern Yunnan) have been extensively investigated in the past. Since the pioneering work by Misch in 1942, multiple investigations have been conducted in this region (Wang, 1955;Liu and Liu, 1963; Nanjing Institute of Geology and Paleontology in Chinese Academy of Sciences, 1974;Cao et al, 1980;Bureau of Geology and Mineral Resources, Yunnan Province, 1997;Zhu et al, 2016;Zhou et al, 2021). The Cryogenian-Ediacaran succession includes the Cryogenian Nantuo Formation, the Ediacaran Lunasi and Dengying formations (Figure 2, Profile 1).…”

“…Based on decades of research, one of the most important outcomes of the studies above is the development of a relatively complete Precambrian lithostratigraphic scheme, which is further applied in tectonic and paleogeographic reconstructions (e.g., Jiang et al, 2003;Bowring et al, 2007;Zhu and Wang, 2011;Zhu et al, 2016;Myrow et al, 2018;Jain et al, 2020;Zhou et al, 2020;Xiao et al, 2022;. However, given the recent developments in the definition and recalibration of the Cryogenian and Ediacaran systems (Shields-Zhou et al, 2016), as well as the latest findings of the Precambrian stratigraphy of the Qinghai-Tibetan Plateau (e.g., Wang et al, 2018;Zhao et al, 2020;Sun L et al, 2022;Sun Y et al, 2022), it is necessary to reestablish a coherent Precambrian lithostratigraphic framework of this region based on the previous scheme (Qian, 1986;Bureau of Geology and Mineral Resources, Qinghai Province, 1997;Bureau of Geology and Mineral Resources, Gansu Province, 1997;He et al, 2014) and new recognitions.…”

Fluctuations of continental chemical weathering control primary productivity and redox conditions during the Earliest Cambrian

“…The Rodina supercontinent broke up started at ~820 Ma, and the South China Block experienced multiple rifts during this process, and finally evolved into a steady passive continental margin in the Ediacaran (Li et al, 2008; Wang & Li, 2003). The South China Basin, located at the present southeastern margin of the Yangtze Block, preserved complete Ediacaran‐Cambrian strata (Jiang et al, 2011; Zhu et al, 2022, Zhu et al, 2003). The Ediacaran units (635 ~ 541 Ma) consist of the Doushantuo and Dengying/Liuchapo/Laobao formations (Zhu et al, 2003).…”