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Article Navigation >  Acta Sedimentologica Sinica  > 2019  >  37(2): 268-277

JIANG YuQiang, HE YuanHan, XING FengCun, GU YiFan, JIANG Chan. Characteristics and Significance of Microbial Mineralization Fabric in Oolitic Limestone: A case from Lower Triassic Feixianguan Formation, northeastern Sichuan Basin[J]. Acta Sedimentologica Sinica, 2019, 37(2): 268-277. doi: 10.14027/j.issn.1000-0550.2018.132
Citation: JIANG YuQiang, HE YuanHan, XING FengCun, GU YiFan, JIANG Chan. Characteristics and Significance of Microbial Mineralization Fabric in Oolitic Limestone: A case from Lower Triassic Feixianguan Formation, northeastern Sichuan Basin[J]. Acta Sedimentologica Sinica, 2019, 37(2): 268-277. doi: 10.14027/j.issn.1000-0550.2018.132
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Characteristics and Significance of Microbial Mineralization Fabric in Oolitic Limestone: A case from Lower Triassic Feixianguan Formation, northeastern Sichuan Basin

doi: 10.14027/j.issn.1000-0550.2018.132
  • 1.

    School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;

  • 2.

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

  • 3.

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

  • 4.

    Exploration Division of PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China

Funds:  National Natural Science Foundation of China, No. 41302089, 41672103; National Science and Technology Major Project, No. 2016ZX05052
  • Received Date: 2018-01-29
  • Rev Recd Date: 2018-04-21
  • Publish Date: 2019-04-10
  • After the PTB's biggest extinction in the world, the Lower Triassic is considered to be the golden era of microbial growth and reproduction. A shallow-water environment is the most favorable for microbial activity and microbial rock formation. Spectral analysis of high-resolution scanning electron microscopy and energy showed three types of microbial mineralized fabric in oolitic limestone, which is the origin of a shallow-water carbonate platform margin on the western side of the Kaijiang-Liangping Trough. These are:cavity-shaped mineralized fabric; micro-nodule-shaped mineralized fabric; and arrow-shaped mineralized fabric. Following comprehensive sedimentological, petrological and geochemical analyses, it is considered that micro-nodule-shaped mineralized fabric consists of dolomitic nanospheroids formed by microbial metabolism. The arrow-shaped mineralized fabric is made up of extracellular polymeric substances (EPS). Cavity-shaped mineralized fabric are microorganism individuals. In addition, a large number of micropores on the surface of calcite crystals were found to be caused by microbial dissolution. The discovery of these microbial mineralized fabrics provides direct evidence of a microbial outbreak in the Lower Triassic. It is assumed that microbial activity is a direct cause of the rapid carbonate deposition phenomenon of the Lower Triassic which led to the rapid Lower Triassic infilling of the Late Permian intracratonic rift in the Kaijiang-Liangping Trough.
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Publishing history
  • Received:  2018-01-29
  • Revised:  2018-04-21
  • Published:  2019-04-10

Characteristics and Significance of Microbial Mineralization Fabric in Oolitic Limestone: A case from Lower Triassic Feixianguan Formation, northeastern Sichuan Basin

doi: 10.14027/j.issn.1000-0550.2018.132
  • 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
  • 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610059, China;
  • 3. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;
  • 4. Exploration Division of PetroChina Southwest Oil and Gas Field Company, Chengdu 610041, China
Funds:  National Natural Science Foundation of China, No. 41302089, 41672103; National Science and Technology Major Project, No. 2016ZX05052
  • Received Date: 2018-01-29
  • Rev Recd Date: 2018-04-21
  • Publish Date: 2019-04-10

Abstract: After the PTB's biggest extinction in the world, the Lower Triassic is considered to be the golden era of microbial growth and reproduction. A shallow-water environment is the most favorable for microbial activity and microbial rock formation. Spectral analysis of high-resolution scanning electron microscopy and energy showed three types of microbial mineralized fabric in oolitic limestone, which is the origin of a shallow-water carbonate platform margin on the western side of the Kaijiang-Liangping Trough. These are:cavity-shaped mineralized fabric; micro-nodule-shaped mineralized fabric; and arrow-shaped mineralized fabric. Following comprehensive sedimentological, petrological and geochemical analyses, it is considered that micro-nodule-shaped mineralized fabric consists of dolomitic nanospheroids formed by microbial metabolism. The arrow-shaped mineralized fabric is made up of extracellular polymeric substances (EPS). Cavity-shaped mineralized fabric are microorganism individuals. In addition, a large number of micropores on the surface of calcite crystals were found to be caused by microbial dissolution. The discovery of these microbial mineralized fabrics provides direct evidence of a microbial outbreak in the Lower Triassic. It is assumed that microbial activity is a direct cause of the rapid carbonate deposition phenomenon of the Lower Triassic which led to the rapid Lower Triassic infilling of the Late Permian intracratonic rift in the Kaijiang-Liangping Trough.

JIANG YuQiang, HE YuanHan, XING FengCun, GU YiFan, JIANG Chan. Characteristics and Significance of Microbial Mineralization Fabric in Oolitic Limestone: A case from Lower Triassic Feixianguan Formation, northeastern Sichuan Basin[J]. Acta Sedimentologica Sinica, 2019, 37(2): 268-277. doi: 10.14027/j.issn.1000-0550.2018.132
Citation: JIANG YuQiang, HE YuanHan, XING FengCun, GU YiFan, JIANG Chan. Characteristics and Significance of Microbial Mineralization Fabric in Oolitic Limestone: A case from Lower Triassic Feixianguan Formation, northeastern Sichuan Basin[J]. Acta Sedimentologica Sinica, 2019, 37(2): 268-277. doi: 10.14027/j.issn.1000-0550.2018.132
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