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New Insight into Factors Controlling Organic Matter Distribution in Lower Cambrian Source Rocks: A Study from the Qiongzhusi Formation in South China

  • Petroleum, Natural Gas Geology
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Abstract

Sedimentary organic matter (OM) is a major reservoir of organic carbon in the global carbon cycle. Despite many studies, there still exist many debates on the mechanism of OM accumulation and preservation in marine sediments. We present a new field study of a Lower Cambrian shallow marine shelf sequence in the northern edge of the Yangtze Plate, China. Our results show that palynological OM and biogenic silica (Bio-Si) could be used alongside more conventional redox and paleo-productivity proxies to study the distribution of OM in marine sediments. The qualitative and quantitative study of palynological OM provides more detailed information on the nature of sedimentary organic carbon, which can be helpful in the assessment of primary productivity and OM preservation. In addition, the presence of Bio-Si stimulates the physical preservation of OM. Further analysis indicates that an increase in Bio-Si can promote OM preservation. This case-study provides insight into the intertwined factors controlling OM accumulation in the Early Cambrian.

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Acknowledgments

We are grateful to the editors for editorial handling and the anonymous reviewers for their critical and constructive comments that have greatly improved the quality of this paper. We express our sincere thanks to the palaeontology research team of the UMR 8198-Evo-Eco-Paleo, CNRS, for allowing the research stay of the senior author at Lille University. We thank Dr. Sebastiaan van de Velde for the language correction. We also thank Prof. Jianxin Yu, senior engineer Zhongbao Liu, and Dr. Thomas Harvey for inspiring discussion. This work was supported by the National Natural Science Foundation of China (No. 41430101) and the State Special Fund from Ministry of Science and Technology (No. 2017ZX05036002). The final publication is available at Springer via https://doi.org/10.1007/s12583-019-1240-y.

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Zheng, S., Feng, Q., Tribovillard, N. et al. New Insight into Factors Controlling Organic Matter Distribution in Lower Cambrian Source Rocks: A Study from the Qiongzhusi Formation in South China. J. Earth Sci. 31, 181–194 (2020). https://doi.org/10.1007/s12583-019-1240-y

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  • DOI: https://doi.org/10.1007/s12583-019-1240-y

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