Abstract Ooids,a typical type of sedimentary grains,are an important proxy for paleoclimate and paleoceanography. To better understand the formation mechanisms,depositional environments and geological significance of these carbonate grains,studies relating to paleontology,sedimentology,and petrography were carried out on the ooid-bearing limestones in the upper Du'an Formation of the Lower Carboniferous in Dujie section of Long'an area,Guangxi. Five ooid types have been identified: Radial ooids(O1),regular concentric-radial ooids(O2),irregular concentric-radial ooids(O3),micrite ooids(O4-A,O4-B),and composite ooids(O5). The microscopic fabric and depositional environments of these ooids uncovered different forming processes,indicating that the formation and distribution of the ooids were influenced by the hydrodynamic conditions. These ooids formed in the late Visean to Serpukhovian,corresponding to the onset of the ice age in the late Mississippian. Influenced by changes of ice volume,sea level changed frequently,resulting in shallow shoal and tidal flat environment in the study area. Dujie area was located in the low latitude,providing shallow,warm,and agitated waters for the ooid formation. Furthermore,calcimicrobes and microbial mats were abundant in the ooid-bearing limestone,indicating that the microbial activities were common and might be related to the formation of these ooids.
Fund:Financially supported by the National Natural Science Foundation of China(Nos. 41972002,41572004)
Corresponding Authors:
Huang Wen-Tao,born in 1990,doctor,is mainly engaged in research of microbialites. E-mail: wentao1990@126.com.
About author: Gong En-Pu,born in 1958,professor,is mainly engaged in researches of paleontology and stratigraphy. E-mail: gongep@mail.neu.edu.cn.
Cite this article:
Gong En-Pu,Yang Zhen-Yuan,Huang Wen-Tao et al. Ooids types of the upper Du'an Formation of lower Carboniferous in Dujie section of Long'an area in Guangxi and their geological significance[J]. JOPC, 2021, 23(1): 125-141.
Gong En-Pu,Yang Zhen-Yuan,Huang Wen-Tao et al. Ooids types of the upper Du'an Formation of lower Carboniferous in Dujie section of Long'an area in Guangxi and their geological significance[J]. JOPC, 2021, 23(1): 125-141.
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