Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (5): 1458-1470.doi: 10.13278/j.cnki.jjuese.201705110

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Carbonate Geochemical Record of Sea-Level Change of Lunshan Formation in Lower Ordovician in Jurong Area

Xu Zhongjie1, Lan Yizhi1, Cheng Rihui1, Li Shuanglin2   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Open Laboratory of Marine Deposition, Qingdao Institute of Marine Geology, Qingdao 266071, Shandong, China
  • Received:2016-12-13 Online:2017-09-26 Published:2017-09-26
  • Supported by:
    Supported by China Geological Survey Project(GZH200800503-WX02),National Natural Science Foundation of China for Youth Science(41402087)and China Postdoctoral Science Foundation(2013M530976)

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Abstract: The Lower Ordovician carbonate sedimentation of Lunshan Formation in Jurong area is composed of an open platform and a deep-water shelf. The sequences 1 and 2, two transgression processes, are both composed of the low stand system and the transgressive system tracts. The relative sea-level lifting curves of Lushan Formation can be drawn based on the paleo-salinity and paleo-bathymetric curves reflected by the values of δ13C, Sr/Ba, 1 000Sr/Ca and V/Ni, combined with the sedimentary environment change and system tract features. The Level I sea-level relative lifting curve reflects that Lunshan Formation underwent a transgression. The Level Ⅱ sea-level curve shows that the sea-level fluctuated frequently. A fluctuation included two sea-level relative rises and one fall. The composition of oxygen and carbon isotope in Lunshan Formation was less affected by the late diagenesis, and it retained basically the original marine isotope composition. The δ13C value falls between -0.8‰ and 2.3‰, and the mean is 0.45‰. The δ18O value falls between -14.4‰ and -9.3‰ and the mean is -10.2‰, mainly in the range of -10.0‰——9.0‰. The Z values calculated from δ13C and δ18O are all greater than 120, which reflects that the carbonate in Lunshan Formation formed in a marine environment.

Key words: Jurong, Lower Ordovician, Lunshan Formation, element geochemistry, oxygen and carbon isotope, sea-level change

CLC Number: 

  • P588.245
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