Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (2): 405-417.doi: 10.13278/j.cnki.jjuese.201702107

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Characteristics, Origin and Geological Significance of Oncolites of Givetian(Middle Devonian) in Ganxi Area, Northwestern Sichuan

Zhou Gang1, Zheng Rongcai2, Zhao Gang3, Wen Huaguo2, Wen Longbin2   

  1. 1. Exploration and Development Research Institute, Southwest Oil & Gas Company, PetroChina, Chengdu 610041, China;
    2. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
    3. Northeast Gas Field of Southwest Oil & Gas Company, PetroChina, Dazhou 635000, Sichuan, China
  • Received:2016-06-07 Online:2017-03-26 Published:2017-03-26
  • Supported by:
    Supported by National Science and Technology Major Project(2016ZX05004005)

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Abstract: A set of Givetian (Middle Devonian) microbial rocks with 2-3 m thickness developed in Ganxi of Longmengshan area, northwestern Sichuan, China. They are composed of oncolites which are 0.1-4.0 cm in diameter, sphere, cap-shaped or deformed. The cores of oncolites are mainly composed of biodetritus including earlier girvanella, and the coatings are composed of light-colored micro-sparry calcite and dark gray layer. Four cycles were recognized according to the abundance and size of these oncolites which are bigger and denser upward, with irregular horizontal distribution. Compared with the fossil brachiopods from the same horizon, negative δ18O and δ13C isotope values and positive 87Sr/86Sr ratios are recognized in the microbialites, show an influences of atmospheric fresh water. Negative δ18O and δ13C isotope values are especially obvious in the spherical oncolites and the light-colored coatings. Then, the forming environment and formation pattern of oncolites are further discussed. At last, the distribution pattern of microbial oncolites in the studied area indicates that more than six structural uplifts happened during the final stage of deposition period of the Jinbaoshi Formation. Thus exposure and leaching of the Jinbaoshi Formation developed under the significant sea level rise during Eifelian and Givetian (Middle Devonian).

Key words: microbialite, oncolite, paleoenvironment, Devonian, Longmenshan area

CLC Number: 

  • P588.2
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