GEOCHEMICAL CHARACTERISTICS AND ENVIRONMENTAL SIGNIFICANCE OF THE CARBONATE ROCKS IN QIXIA-MAOKOU FORMATION IN WESTERN ZHENXIONG, NORTHEASTERN YUNNAN

PAN Ming; HAO Yan-zhen; LV Yong; SHAN Ke-qiang; SU Guang-yang

Volume 23 Issue 3

Jun. 2017

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Article Navigation > Journal of Geomechanics > 2017 > 23(3): 348-357

PAN Ming, HAO Yan-zhen, LV Yong, et al., 2017. GEOCHEMICAL CHARACTERISTICS AND ENVIRONMENTAL SIGNIFICANCE OF THE CARBONATE ROCKS IN QIXIA-MAOKOU FORMATION IN WESTERN ZHENXIONG, NORTHEASTERN YUNNAN. Journal of Geomechanics, 23 (3): 348-357.

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GEOCHEMICAL CHARACTERISTICS AND ENVIRONMENTAL SIGNIFICANCE OF THE CARBONATE ROCKS IN QIXIA-MAOKOU FORMATION IN WESTERN ZHENXIONG, NORTHEASTERN YUNNAN

Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China

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Abstract

Abstract

Qixia-Maokou Formation in Middle Permain, in Anjiaba of Zhenxiong County, is well outcropped and continuously deposited. Making this section as the research object, collecting 42 samples of carbonate rocks, based on the microscopic characteristics, the elements correlation, the elements content as well as the ratio characteristics of the related elements, the geochemical characteristics and the paleo environmental significance of the carbonate rocks in the study area were discussed. Some conclusions have been drawn. Firstly there are obvious negative correlations between CaO and SiO₂, MgO in the rock samples, and the contents of the latter two in rocks are rather low, which both indicate that the samples are less affected and transformed by the terrigenous material in the process of deposition and diagenesis. Secondly, based on the analysis of the element contents and the vertical distribution characteristics of the relevant elements ratios, such as Sr/Ba, MgO/CaO and V/V+Ni etc, and the study of the paleo-water depth and the paleo-oxygenation facies in different sedimentary stages, the data show that compared with Qixia Formation, the sedimentary environment of Maokou Formation has obvious difference.
- Carbonate rocks,
- Geochemical characteristics,
- palaeoenvironment,
- Qixia Formation,
- Maokou Formation

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