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Discovery of bioturbated thrombolites in the Lower Ordovician of Songzi area,Hubei Province

Xiao Chuan-tao,Xiao Yun-peng,Song Zhen-yu,Huang Yun-fei,Dong Man   

  1. Geosciences School of Yangtze University,Wuhan 430100,China
  • Received:2018-02-14 Revised:2018-05-20 Online:2018-08-10 Published:2018-08-10

Abstract: It is the first time that bioturbated thrombolites was discovered from the Lower Ordovician in Songzi area of Hubei Province.This discovery not only fills gaps in the research field of the studying area,providing new material for the study of the genesis of thrombolites,but also has important theoretic meaning for exploring the relationship between the evolution of coagulation stone and the radiation of metazoan.According to the appearance and structure of the thrombolites,porphyritic,reticular and striped clotted limestone was recognized in this paper.Based on the detailed description of the sedimentary characteristics of each type of thrombolite,the sedimentary environment is analyzed.It is thought that the maculosus,striped clotted limestone may be formed in the restricted intertidal zone with certain energy,and the reticulated coagulation stone may be formed in the low energy environment of subtidal zone.Based on a number of drilling predation fossils of mollusks Ecculiomphalus found in leopard porphyritic,reticulated thrombolites and traces of bioturbation formed by the drilling animals,the authors suggest that both leopard porphyritic and reticulated coagulation stone are bioturbated thrombolites.The authors believe that the Ordovician thrombolites are decreasing with time,and there is a certain relationship between the decline of thrombolites and the increase of metazoan.The authors also believe that drilled predators not only chew up the bacteria and algae microbes forming thrombolites and stromatolites,resulting in the continuous reduction in the number of stromatolites,but also destroyed the growth state of the stromatolites,resulting in the formation of the unique characteristics of the bioturbation type of thrombolites.

Key words: Thrombolites, Bioturbation, Stromatolites, Lower Ordovician, Songzi area

CLC Number: 

  • TE121.3

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