Abstract Xiangxibei area refers to the northwestern Hunan Province mainly, Taoyuan, Yuanling, Huaihua cities. Lithofacies have been investigated, on the basis of the key Lower Ordovician sections collected during the field mapping projects. The lithofacies palaeogeography maps of the Tremadocian and Floian ages are presented here. The lithofacies palaeogeographic analyses suggest that there was a palaeo-uplift in areas of Zhangjiajie-Guzhang-Jishou, which shows the significant difference in lithofacies between both sides of the palaeo-uplift. The Tongzi and Honghuayuan Formations were formed on carbonate platform facies in the northwestern of palaeo-uplift,including six types of subfacies, including restricted-platform,open-platform,platform edge,marginal reef of platform,platform slope and shollow sea shelf. The Baishuixi/Panjiazui and Qiaotingzi sormations were formed on the shelf in the southeastern of palaeo-uplift,including two types of facies(i.e. ,mixed shelf and clastic shelf). Results from this work improve the understanding of the Early Ordovician,and provide important information for evaluation of geological prospecting in the area.
Fund:Co-funded by the Geological Survey Project of China Geological Survey(No. DD20160029) and the Geological Survey Projects of Hunan Province(Nos.12120114066201,12120113062200)
About author: Zou Guang-Jun,born in 1986,an engineer,graduated from Chengdu Technology University in 2011. He is mainly engaged in searching for minerals in region geology and basic geology. E-mail: 182458454@qq.com.
Cite this article:
Zou Guang-Jun,Liang En-Yun,Zhang Xiao-Yang et al. Sedimentological characteristics and lithofacies palaeogeography of the Early Ordovician in northwestern Hunan Province[J]. JOPC, 2018, 20(1): 105-118.
Zou Guang-Jun,Liang En-Yun,Zhang Xiao-Yang et al. Sedimentological characteristics and lithofacies palaeogeography of the Early Ordovician in northwestern Hunan Province[J]. JOPC, 2018, 20(1): 105-118.
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