| Citation: |
Xian-yin An, Yu-jie Zhang, Li Tian, Shi-lei Liu, Qi-yu Wang, Yong Du, Hu-yue Song, Jun Hu, 2023. δ13Corg perturbations preserved by the interglacial Datangpo Formation in South China with implications for stratigraphic correlation and carbon cycle, China Geology, 6, 420-428. doi: 10.31035/cg2022069
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δ13Corg perturbations preserved by the interglacial Datangpo Formation in South China with implications for stratigraphic correlation and carbon cycle
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Abstract
Palaeoclimatic and palaeoenvironmental reconstructions of the Cryogenian Period have attracted attention in relation to the debated “Snowball Earth” hypothesis and the early evolution of metazoan life. The carbon cycle and redox conditions of the Sturtian-Marinoan non-glacial interval have been subjected to much controversy in the past decades because of the lack of a high-resolution stratigraphic correlation scheme. As one of the typical Sturtian-Marinoan interglacial deposits, the Datangpo Formation was widely distributed in South China with shales continuously deposited. The previous zircon dating data of the Datangpo Formation provide important ages for global constrain of the Sturtian-Marinoan non-glacial interval. Here we present a high-resolution straitigraphic study of the organic carbon isotopes of the Datangpo Formation from a drill core section in northern Guizhou Province. Based on measured episodic δ13Corg perturbations, three positive shifts and three negative excursions are identified. A δ13Corg-based chemostratigraphic correlation scheme is proposed herein that works well for the Datangpo Formation regionally. Meanwhile, the δ13Corg vertical gradients changed dynamically throughout the formation. This discovery implies that a significant ocean circulation overturn might have occurred in the upper Datangpo Formation, coinciding with the potential oxygenation.
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References
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Xian-yin An, Yu-jie Zhang, Li Tian, Shi-lei Liu, Qi-yu Wang, Yong Du, Hu-yue Song, Jun Hu, 2023. δ13Corg perturbations preserved by the interglacial Datangpo Formation in South China with implications for stratigraphic correlation and carbon cycle, China Geology, 6, 420-428. doi: 10.31035/cg2022069
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Figure 1.
Palaeogeographic location of the studied area and the regional Neoproterozoic lithological successions. (a) is modified from Ai JY (2021); (b) shows the general stratigraphic successions of the Hubei-Hunan-Chongqing-Guizhou area, modified from Hoffman PF and Li ZX (2009) while the dating data are from Condon D et al. (2005) and Zhou CM et al. (2019). DTP‒Datangpo; TSA‒Tiesi’ao; GC‒Gucheng.
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Figure 2.
Field photographs of the drilled core samples. a‒uppermost Datangpo with the basal Nantuo Formations. The breccias of mixtite are shown with arrows. b‒basal Datangpo cap carbonates, as the bottom of the drilled core section.
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Figure 3.
Carbon isotopes and TOC contents profiles of the Datangpo Formation in the studied TZK section. Note: the thickness scales are varied in three members.
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Figure 4.
Cross-plots of organic carbon isotopes and TOC contents of the studied Datangpo Formation in the TZK section.
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Figure 5.
Organic carbon isotope-based regional stratigraphic correlation of the Datangpo Formation. The raw data of TZK are from this study. Note that the open circles are averaged measurements with 10 m sampling bins. The original data of Daotuo and Minle are after Peng X et al. (2019).
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Figure 6.
Carbon isotope-based global stratigraphic correlations of the Sturtian-Marinoan interglacial interval. Following the correlation scheme proposed by Verdel C and Campbell M (2017), the three negative δ13Ccarb excursions are highlighted in gray: the N1 corresponds to the Rasthof excursion, N2 to the Taishir excursion and N3 to the Trezona excursion. The left composited Neoproterozoic δ13Ccarb curves are from Macdonald FA et al. (2010). The high precision dating data are from Macdonald FA et al. (2010) and Zhou CM et al. (2019). The right global correlations are simplified after Verdel C and Campbell M (2017) with additional data (δ13Ccarb and δ13Corg of Mongolia) from Johnston DT et al. (2012).
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Figure 7.
Composited and correlated δ13Corg of the Datangpo Formation from South China. ∆N/P = Max δ13Corg − Min δ13Corg. The data sources and correlations are following Fig. 6.