Paleoproterozoic glaciation: Evidence from carbon isotope record of the Hutuo Group, Wutai Mountain area of Shanxi Province, China

The termination and aftermath of the Lomagundi-Jatuli carbon isotope excursions in the Paleoproterozoic Hutuo Group, North China

“…The trend ends with exclusively negative δ 13 C preserved in > 500 m thick dolostones of the Huaiyincun and Beidaxing Formations (stage C). The δ 13 C carb curve is generally consistent with previously published data (Kong et al, 2011;Zhong and Ma, 1997). Zhong and Ma (1997) noted the abrupt changes of δ 13 C carb near the Jianancun/Daguandong and Daguandong/Huaiyincun boundaries respectively, with the latter being also observed in this study.…”

“…These were considered to reflect changes in the burial rate of organic carbon. Kong et al (2011) observed a decrease in δ 13 C carb values from the Wenshan Formation to the middle Daguandong Formation and a pronounced negative δ 13 C carb excursion at the boundary between the Daguandong and Huaiyincun Formations, which are interpreted by the authors as the response to global glaciations in the Paleoproterozoic. This interpretation, however, is based on a problematic chronological framework that has placed the Hutuo Group between 2.5 and 2.2 Ga.…”

“…The North China Craton (NCC) is an Early Precambrian continental block with well exposed Paleoproterozoic sequences, including the Hutuo Group in the Wutai area of Shanxi Province, the Songshan Group in northern Henan Province, and the Liaohe Group in eastern Liaoning Province. During the last two decades or so, attempts have been made to locate positive δ 13 C carb excursions in these successions correspond to the global excursions (Lai et al, 2012;Kong et al, 2011;Tang et al, 2011;Zhong and Ma, 1997). Available data have documented the presence of carbonates with δ 13 C up to 3.5‰ (Zhong and Ma, 1997) or 3.2‰ (Kong et al, 2011) in the Hutuo Group, to 4.2‰ in the Songshan Group (Lai et al, 2012), and to 5.9‰ in the Liaohe Group (Tang et al, 2011).…”

“…Some of these studies, however, are based on problematic chronological framework ( Fig. 1; Kong et al, 2011;Zhong and Ma, 1997) or provide only limited data (Lai et al, 2012;Tang et al, 2011) which dampen the correlation with global events. In this study we conducted detailed study of the geology of the Hutuo Group in the Wutai area and obtained C-O isotopic and elemental composition data for 152 carbonate samples.…”

Background variations of atmospheric CO2 and carbon‐stable isotopes at Waliguan and Shangdianzi stations in China

“…Many stable isotope studies on tree rings, ice cores, loess, minerals, plants, and other materials have been carried out in China [ Chen et al ., ; Kong et al ., ; Liu et al ., ; Song et al ., ; Sun et al ., ; Wang et al ., , ; Wen et al ., ]. However, observation and analysis of δ 13 C in atmospheric CO 2 is rarely reported.…”