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2021 Vol. 48, No. 1
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XU Xudong, LI Fengjie, YAN Dawei, LI Chunsen. 2021. Genesis and paleoenvironment of the iron ooids from the Ganxi prolife of the Devonian Yangmaba Formation in Beichuan County, Longmenshan Area[J]. Geology in China, 48(1): 322-331. doi: 10.12029/gc20210122
Citation: XU Xudong, LI Fengjie, YAN Dawei, LI Chunsen. 2021. Genesis and paleoenvironment of the iron ooids from the Ganxi prolife of the Devonian Yangmaba Formation in Beichuan County, Longmenshan Area[J]. Geology in China, 48(1): 322-331. doi: 10.12029/gc20210122
shu

Genesis and paleoenvironment of the iron ooids from the Ganxi prolife of the Devonian Yangmaba Formation in Beichuan County, Longmenshan Area

  • 1.

    Energy collage, Chengdu University of Technology, Chengdu 610059, Sichuan, China

  • 2.

    Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, Sichuan, China

  • 3.

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, CDUT, Chengdu 610059, Sichuan, China

    • Fund Project: Supported by National natural science foundation of China(No.41172100), National undergraduate innovation and entrepreneurship training program(No.201710616141) and Sedimentary geology innovation team fund of Chengdu University of Technology (No.KYTD201703)
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  • Author Bio: XU Xudong, male, born in 1997, bachelor's degree, engages in the study and research of sedimentology; E-mail:xuxudong949981291@163.com
  • Corresponding author: LI Fengjie, male, born in 1972, professor, engages in the teaching and research of sedimentology, E-mail:lifengjie72@163.com 
Received Date:  01 November 2018
Revised Date:  05 March 2019
Publish Date:  25 February 2021
    Abstract

  • There exist abundant iron ooids at the bottom of the Middle Devonian Yangmaba Formation in the Longmenshan area. In order to analyze the genesis of the iron ooids, their characteristics were studied by means of thin section and scanning electron microscope based on the detailed measurement of the Shiligou Profile in Ganxi village. The analysis results show that there are various types of ooids in Middle Devonian Yangmaba Formation of Longmenshan area. The ooidal cores include four types:quartz clastic particles, crinoid fragments, black hematite and calcite. The outer laminas of ooids can be divided into three types:alternate dark and bright one, uniform-colored one and chlorite-fragmented one. The iron ooids of Middle Devonian Yangmaba Formation in the Longmenshan area have an important significance to the ancient environment. The silty ooids were formed in the open environment nearshore shallow water under oxidation condition, and iron ones and chlorite ones with thin layers were deposited in the relatively closed lagoon and residual ooids beach of shallow seashore.

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