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Elemental geochemical characteristics and limit on sedimentary environmentin the Late Ordovician Wufengian period in the Wuxi area,NE Chongqing

Liu Tian1,Feng Ming-you1,Wang Xing-zhi1,2,Chen Bo3,Zhang Liang-hua3,Liu Xiao-hong1,2,Wang Jue-bo1   

  1. 1.School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;
    2.Sichuan Provincial Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,China;
    3.Geology Institute of Chongqi Gas District,PetroChina Southwest Oil & Gas Field Company,Chongqing 400000,China
  • Received:2018-12-21 Revised:2019-01-31 Online:2019-05-10

Abstract: The deep-water rocks are confused to reflect fluctuation of sea level by the fine-grained sediments and occurrence of a thin succession.Upper Ordovician black siliceous rocks and siliceous shales (Wufeng Formation) from Wuxi (Northeastern Chongqing,Southwest China) are studied using integrated petrographic,and geochemical methods (major,trace elements and REE) and pyrite framboid in order to decipher depositional conditions during the sedimentation of siliceous rocks.Al2O3/(Al2O3+Fe2O3),SiO2/Al2O3 and Al-Fe-Mn values indicate that the sediments of Wufeng Formation are deposited in a continental margin and influenced by detrital input.UEF-MoEF and V/Cr-U/Th cross plots suggest the Wufeng Formation was formed in dysoxic to anoxic conditions.In addition,redox proxies such as U/Th and V/Cr suggest that the lower part of Wufeng Formation was deposited in an anoxic environment,while the upper part was deposited in a dysoxic environment.Furthermore,the gradual increase of the average size of pyrite framboids (from 3.46μm to 4.21μm) shows that the oxidizability increased.During the Wufengian period deposition,sea level fluctuations can be divided into a third-order cycles and subdivided into five fourth-order cycles.U/Th,Ni/Co,V/Cr,and the size of pyrite framboid decrease gradually,which indicates that oxidizability (from anoix to dysoxic) and depth of the water gradually increased.The sedimentary environment was transformed from outside shelf to inner shelf.

Key words: Northeastern Chongqing, Bailu section, Late Ordovician, Wufeng Formation, Redox proxies, Pyrite framboid, Eustatic cycles

CLC Number: 

  • TE122.1+13
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