Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 356-379.doi: 10.13278/j.cnki.jjuese.20180221

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Geochemical Characteristics and Formation Environment of Mesozoic and Cenozoic Evaporative Rocks in Lanping Basin, Western Yunnan

Zhang Zhibo1,2, Zhu Zhijun1, Wang Wenfeng1, Xu Ying1, Li Lirong1   

  1. 1. College of Earth Sciences, East China University of Technology, Nanchang 330013, China;
    2. Shaanxi Province 194 Coalfield Geology Co., Ltd., Tongchuan, 727000, Shaanxi, China
  • Received:2018-08-22 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by National Natural Science Foundation of China (41362008) and Jiangxi Province Graduate Innovation Project (YC2016-S277)

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Abstract: Evaporates are widely developed in Lanping basin and closely related to base metal. In this study, the rare earth elements and trace elements of 49 gypsum, limestone and paste mud samples from Triassic Sanhedong Formation and Paleogene Yunlong Formation in Lanping basin were analyzed by inductively coupled plasma mass spectrometry (ICP-MS). The results show that the geochemical characteristics of gypsum and limestone are similar but different from those of plaster. The characteristics of rare earth partitioning mode of gypsum and limestone are relatively flat and chaotic. The difference is that both positive and negative Eu anomalies of gypsum occur, while only negative Eu anomalies are found in limestone.The characteristic ratios of Sr/Ba, Sr/Cu, V/Cr, V/(V+Cr), Ni/Co, U/Th and δU of gypsum and limestone are similar,but they are significantly different from paste. The rare earth elements of paste show an obvious "V" shape of negative Eu anomaly,more steep than those of gypsum and limestone. It indicates that gypsum and limestone were formed in a salt-water-anoxic reductive environment of dry climate, with different material sources:The salt source of gypsum was participated by deep brine, while the limestone was not involve in deep brine.Plaster was formed in warm and humid oxidation environment of brackish water, fresh water and oxygen-rich water, and its material source is similar to that of limestone, which may be caused by cyclical changes in climate.

Key words: geochemistry, evaporate, gypsum, Lanping basin, environment

CLC Number: 

  • P588.247
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