Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (5): 1327-1337.doi: 10.13278/j.cnki.jjuese.20180120

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Petrogenesis and Sedimentary Environment of Cherts of Dengying Formation in Huize County, Northeastern Yunnan: Evidence from Petrology and Geochemistry

Chen Qingsong1, Yang Runbai1, Liu Demin2, Tao Lanchu1   

  1. 1. The 10 th Gold Detachment of Chinese People's Armed Police, Kunming 650000, China;
    2. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
  • Received:2018-05-20 Published:2019-10-10
  • Supported by:
    Supported by Project of China Geological Survey (12120113072100)

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Abstract: The cherts of Dengying Formation are widely distributed in Huize County in northeastern Yunnan in the 1:50 000 regional survey. This paper mainly focuses on the petrogenesis and their petrological and geochemical characteristics. The cherts in the lower segment of the Sinian-Cambrian Dengying Formation are relatively rich in Al, Ti and ΣREE, with negative Ce anomaly and positive Eu anomaly; the cherts in the middle segment are characterized by high contents of Ca and Mg, relatively low contents of ΣREE (total LREE> total HREE), with negative Ce anomaly and various Eu anomalies; the cherts in the upper segment display relatively low contents of ΣREE (total LREE> total HREE), with negative Ce anomaly and various Eu anomalies. Combined with the regional tectonic evolution in the Sinian-Cambrian region, the petrological and geochemical characteristics indicate that the lower segment chert is deposited in a normal seawater environment, the middle segment chert is a product of a hydrothermal sedimentary environment, and the upper segment chert belongs to a product of normal seawater influenced obviously by hydrothermal fluids. The Dengying Formation chert in the Huize area is formed in a shallow sea shelf environment on the edge of heterogeneous continent.

Key words: northeastern Yunnan, Dengying Formation, chart, geochemistry, sedimentary environment

CLC Number: 

  • P581
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