Geochemistry of the Late Paleozoic cherts in the Youjiang Basin: Implications for the basin evolution
Huang Hu1, Du Yuansheng1,*, Yang Jianghai1, Huang Hongwei2, Tao Ping3, Huang Zhiqiang1,2, Yu Wenchao1, Guo Hua1
1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Wuhan), Wuhan 430074, China
2. General Academy of Geological Survey of Guangxi, Nanning 530023, China
3. Guizhou Academy of Geological Survey, Guiyang 550004, China
We analyzed the major and rare earth element compositions of siliceous deposits from the Upper Devonian Liujiang Formation, Lower Carboniferous Luzhai Formation, Lower-Middle Permian Sidazhai Formation and Tapi Formation, which are widely distributed as bedded cherts in the interplatform basinal successions of the Youjiang Basin. The Liujiang Formation and Luzhai Formation cherts generally have high Al/(Al+Fe+Mn) values (0.38-0.94) and are non-hydrothermal cherts. These cherts are generally characterized by moderately negative Ce anomalies and high Y/Ho values relatived to PAAS, indicating that the Youjiang Basin might have evolved into an open rift basin during the Late Devonian-Early Carboniferous. The Sidazhai Formation cherts from Ziyun generally have high Al/(Al+Fe+Mn) values (0.60-0.78), suggesting negligible contribution from a hydrothermal component. The Sidazhai Formation cherts from Hechi and the Tapi Formation cherts from Malipo generally have low Al/(Al+Fe+Mn) values (0.09-0.41), indicating an intense hydrothermal input. Relatived to the Sidazhai Formation cherts, the Tapi Formation cherts have higher Ce/Ce* values (0.68±0.19) and lower Y/Ho values (41.83±13.27), which may be affected by the terrigenous input from the Vietnam Block. The Sidazhai Formation cherts from Ziyun and Hechi exhibit negative Ce anomalies (0.43±0.12, 0.33±0.17, respectively) with high Y/Ho values (57.44±16.20, 46.02±4.27, respectively), resembling the geochemical characteristics of open-ocean basin cherts. These cherts were deposited on a passive continental margin adjacent to the Babu branch ocean, which may have contributed to upwelling. Detailed spatial studies on geochemical characteristics of the Late Paleozoic cherts can unravel the evolution of the Youjiang Basin.
We are grateful to Mei Mingxiang, Graham Shields Zhou and an anonymous reviewer for their constructive reviews of our manuscript. We also thank Liu Yongsheng, Chen Haihong and Zheng Hongtao for their support and help in the bulk-rock geochemical analyses. This work was financially supported by National Natural Science Foundation of China (No. 41272120 and No. 40972078).
Huang Hu,Du Yuansheng,Yang Jianghai et al. Geochemistry of the Late Paleozoic cherts in the Youjiang Basin: Implications for the basin evolution[J]. Journal of Palaeogeography, 2013, 2(4): 402-421.
Huang Hu,Du Yuansheng,Yang Jianghai et al. Geochemistry of the Late Paleozoic cherts in the Youjiang Basin: Implications for the basin evolution[J]. Journal of Palaeogeography, 2013, 2(4): 402-421.
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