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Influence of volcanism on the development of black shales in the Chang 7 Member of Yanchang Formation in the Ordos Basin

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Abstract

In geological history, volcanism is closely related to the deposition of many black shales. However, the specific mechanism between volcanism and the deposition of black shales is still unclear. The black shales developed in the Chang 7 Member of the Yanchang Formation in the Ordos Basin are considered the most important hydrocarbon source rocks in Central China. The shales are deposited by frequent volcanic activities and preserved by extremely rich volcanic ash layers, making them an excellent example when investigating the influence of volcanism on the deposition of black shales. In this paper, petrographic, mineralogical, and geochemical analyses of three typical tuff and black shale segments of the Chang 7 Member were carried out. The productivity indicators [total organic carbon (TOC), P/Al, Ni/Al, and Cu/Al], redox indicators (V/Al, Mo/Al, U/Al and U/Th), and clastic influx indicators (Ti/Al and ƩREE) of the shales basically increased together in the longitudinal direction, and a relatively good positive correlation existed between P/Al, Ni/Al, Cu/Al, V/Al, Mo/Al, U/Al, U/Th, Ti/Al, ƩREE, and TOC. This finding indicated that the development of the Chang 7 black shales is the result of a combination of high primary productivity, anoxic conditions, and increased clastic influx. Considering that increased clastic influx may dilute organic matter, many phosphate nodules represented high productivity above the volcanic ash layers, and anoxic conditions are likely to be the result of a large amount of organic matter degradation indicated by the covariations of TOC versus P/Al and TOC versus Ba/Al. Therefore, the Chang 7 black shales in this study may be mainly controlled by the increased primary productivity. In addition, compared with the Weathering Index of Parker of background shales (not the contact clip or tuff layer), that of the black shales was significantly reduced after tuff deposition. On the contrary, the clastic influx indicators, redox indicators, productivity indicators of black shales significantly increased. This finding suggested that a series of environmental effects, such as enhanced weathering of terrestrial sources, increased clastic influx, anoxic water, and productivity bloom, was likely caused by volcanic activity. Considering that hydrothermal activity at the same time as volcanism may not cause productivity bloom, the nutrients (P/Al and Fe/Al) of the Chang 7 tuffs were significantly depleted, and the total sulfur content of black shales was much higher than that in ordinary freshwater sedimentation. Therefore, this paper reviewed and proposed the volcanism hypothesis model of the Chang 7 black shales. Volcanism generates large amounts of SO2 and volcanic ash. SO2 forms large areas of acid rain and accelerates terrigenous weathering with an increase in the lake land-based sources of debris and nutrient supply, while volcanic ash is decomposed and releases nutrients. These phenomena lead to biological productivity bloom and massive accumulation of organic matter, which in turn results in lake water anoxia and the eventual formation of black shales.

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modified by Guo et al. (2016) and Yang and Deng (2013)]

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Acknowledgements

We would like to thank Liang Qi from the Institute of Geochemistry, Chinese Academy of Sciences, for the major and trace metals analysis. This research was supported by the National Natural Science Foundation of China (41321002 and 41272144), the scientific and technological project B of the strategic precursor, the Chinese Academy of Sciences (XDB10000000), and the Fundamental Research Funds for the Central Universities (300102120105), CHD. We would like to extend thank you for improving the grammer of the manuscript by a native English-speaking geoscientist, the insightful comments and suggestions by Thomas Algeo and an anonymous reviewer, Wolf-Christian Dullo and Wenjiao Xiao is highly acknowledged.

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Wang, C., Wang, Q., Chen, G. et al. Influence of volcanism on the development of black shales in the Chang 7 Member of Yanchang Formation in the Ordos Basin. Int J Earth Sci (Geol Rundsch) 110, 1939–1960 (2021). https://doi.org/10.1007/s00531-021-02050-8

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