Chemostratigraphy of the Mesoproterozoic Shennongjia Group, Yangtze Craton (South China): Implications for oxidized shallow seawaters

Characteristics of the carbon cycle in late Mesoproterozoic: Evidence from carbon isotope composition of paired carbonate and organic matter of the Shennongjia Group in South China

“…This positive shift has been observed in India (Maheshwari et al, 2009;Patranabis-Deb et al, 2016), Siberia (Bartley et al, 2007), and Laurentia (Beeunas and Knauth, 1985;Moon, 2015;Lathrop, 2018). Therefore, such 13 C-enriched carbonates also occur in the Yemahe and Wenshuihe formations of the Shennongjia Group (this work; Tian et al, 2018;Zou et al, 2019), thereby suggesting a possibly global phenomenon. In addition, some studies have proposed that the sharply δ 13 Ccarb positive excursion up to +5‰ around 1200 Ma can be served as a marker for global stratigraphic correlation (Frank et al, 2003;Bartley et al, 2007;Lathrop, 2018;Silva-Tamayo et al, 2018;Paula-Santos et al, 2021) and consequently, these new observations from South China raise questions about the term 'boring billion' adopted for the Mesoproterozoic.…”

“…However, it should be noted that high  13 Ccarb values > +2‰ have been observed in the Yingwodong and Dayanping formations (Fig. 8, Tian et al, 2018;Zou et al, 2019). These high  13 Ccarb values are distinctly different from those in the early Mesoproterozoic.…”

“…2A-B). Halite pseudomorphs have been observed in the uppermost red dolostone (Li et al, 2013;Zou et al, 2019). The top of the Luanshigou Formation is characterized by a ~1 m thick bed of conglomerate consisting of quartz clasts.…”

“…The  13 Ccarb values of the Shennongjia Group have been analyzed by three independent research groups (Supplementary Data Table S3), and they are all compiled in Fig. 8 (Tian et al, 2018;Zou et al, 2019;this study). In ascending order, the  13 Ccarb chemostratigraphy of the Shennongjia Group can be divided into three periods.…”

The modern phosphorus cycle informs interpretations of Mesoproterozoic Era phosphorus dynamics

“…The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. (Blake, 1987), 2 (Luo et al, 2014), 3 (Summons et al, 1988, 4 (Sperling et al, 2014a), 5 (Zou et al, 2019), 6 (Canfield et al, 2018b, 7 (Wang et al, 2017), 8 (Turner and Kamber, 2012), 9 (Kah et al, 2012) NA: not available (Guo et al, 2013), 2 (Zou et al, 2019), 3 (Wang et al, 2017), 4 (Kah et al, 1999, 5 (Gilleaudeau and Kah, 2013)…”