Abstract
The Lungmachi Formation is widely distributed in Guizhou, Chongqing and the adjacent area. It is important for the study of Silurian biostratigraphy and shale-gas investigation. Based on those biostratigraphically well-studied sections from Guiyang to Huayingshan, we reveal the stage-progressive distribution pattern of the Lungmachi black shales. The distribution of the Lungmachi black shales in the studying area can be subdivided into four geographic belts from the south to the north, reflecting the joint effect of regional and global environmental changes. The graptolite depth zonation model was adopted herein to infer the water depth of major graptolite assemblages from the black shales. The changes in the water depth indicate two major stages. The first stage is named the transgressive distribution stage which ranged from the Persculptograptus persculptus Biozone (LM1, upper Hirnantian) to the Coronograptus cyphus Biozone (LM5, upper Rhuddanian), an interval mostly controlled by global sea-level rise. The second stage, ranging from the Demirastrites triangulatus Biozone (LM6, lower Aeronian) to the Spirograptus guerichi Biozone (LM9, lower Telychian), is named the regressive shrinking stage, during which the black shales were gradually replaced by mixed-facies or carbonate sediments from the south to the north, representing the effects of the persistent uplifting of the Central Guizhou Oldland.
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Acknowledgements
Unfortunately, during preparation of the manuscript, Dr. Lin Yaokun, who studied the graptolites of the Lungmachi Formation from Hanjiadian (Tongzi) together with one of the authors (Chen Xu), passed away. His research work on the Lungmachi Formation has greatly contributed to the present study. The authors express their acknowledgments to Prof. Daniel Goldman for polishing the English manuscript. This study was supported by Chinese Academy of Sciences (Grant No. XDB10010100) and National Natural Science Foundation of China (Grant Nos. U1562213 and 41272042). It is also a contribution to the Geobiodiversity Database Project.
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Chen, X., Fan, J., Wang, W. et al. Stage-progressive distribution pattern of the Lungmachi black graptolitic shales from Guizhou to Chongqing, Central China. Sci. China Earth Sci. 60, 1133–1146 (2017). https://doi.org/10.1007/s11430-016-9031-9
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DOI: https://doi.org/10.1007/s11430-016-9031-9