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Sedimentary characteristics and depositional model of a Paleocene-Eocene salt lake in the Jiangling Depression,China |
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| Authors: | Xiaocan Yu Chunlian Wang Chenglin Liu Zhaochong Zhang Haiming Xu Hua Huang Tengxiao Xie Haonan Li Jinlei Liu |
| Institution: | 1. State Key Laboratory of Geological Processes and Mineral Resources, School of the Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing, 100083, China 2. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resource, Chinese Academy of Geological Sciences, Beijing, 100037, China 3. Research Institute of Exploration and Development of Jianghan Oilfield Branch Company of SINOPEC, Wuhan, 430223, China 4. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing, 100083, China 5. School of Geosciences, Yangtze University, Wuhan, 430100, China |
| Abstract: | We studied the sedimentary characteristics of a Paleocene-Eocene salt lake in the Jiangling Depression through field core observation,thin section identification,scanning electron microscopy,and X-ray diffraction analysis.On the basis of sedimentary characteristics we have summarized the petrological and mineralogical characteristics of the salt lake and proposed 9 types of grade IV salt rhythms.The deposition shows a desalting to salting order of halite-argillaceous-mudstone-mud dolostonemud anhydrock-glauberite-halite.The relationship among grade IV rhythms,water salinity and climate fluctuations was analyzed.Based on the analysis of the relationship between boron content and mudstone color and by combining the mineralogy and sedimentary environment characteristics,we propose that the early and late Paleocene Shashi Formation in the Jiangling Depression was a paleolacustrine depositional environment with a high salt content,which is a representation of the shallow water salt lake depositional model.The middle Paleocene Shashi Formation and the early Eocene Xingouzui Formation were salt and brackish sedimentary environments with low salt content in a deep paleolake,which represents a deep salt lake depositional model. |
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