Giant ooids induced and predominated by photosynthetic biofilms of filamentous cyanobacteria: an example from the Miaolingian Xuzhuang Formation at the Shijing section in Xin'an County of Henan Province,North China Platform
Mei Ming-Xiang1,2
1 School of Earth Sciences and Natural Resources,China University of Geosciences(Beijing),Beijing 100083,China; 2 State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences(Beijing),Beijing 100083,China
Abstract Diversified forming environments and 3000 million years of history clearly express that ooid is an enchanting depositional grain whose origin remains a dilemma,and its formation is still actively debated that is reflected as the strongly difference between the organic and inorganic origins of ooids. Giant ooids from the top part of the Miaolingian Xuzhuang Formation at the Shijing section in Xin'an County of Henan Province are made of calcite and show concentric,radial-concentric,and micritic fabrics. Within both the core and the cortex of these ooids there are excellent calcified residues of photosynthetic biofilms reflected as the high-density preservation of the Girvanella,which provide a relative direct evidence of ooid formation that is genetically related to the photosynthetic biofilm,since it is relatively certain that Girvanella resembles closely recent calcified Plectonema. Therefore,although the exact forming mechanism of radial-fibrous calcites making up the cortex of radial ooids in the calcite sea of the Cambrian that is marked by cayanobacterial blooms and is coincided with metazoan radiation is not wholly understand,direct evidences of that the formation of these giant ooids is dominated,nourished and promoted by photosynthetic biofilms further support an important scientific idea,i.e. ooid deposits can be understood as a new differentiated type of microbialite system. Ultimately,our finding and study provide an important example for the further understanding and elucidating of the “ooid dilemma”.
Fund:Financially supported by the National Natural Science Foundation of China(Nos. 41472090,40472065,49802012)
About author: About the author Mei Ming?Xiang,born in 1965, graduated from China University of Geosciences in 1993,and obtained Ph.D. degree. Now he is a professor at School of Earth Sciences and Resource,China University of Geosciences(Beijing),and is engaged in researches on sedimentology and stratigraphy. meimingxiang@263.net.
Cite this article:
Mei Ming-Xiang. Giant ooids induced and predominated by photosynthetic biofilms of filamentous cyanobacteria: an example from the Miaolingian Xuzhuang Formation at the Shijing section in Xin'an County of Henan Province,North China Platform[J]. JOPC, 2021, 23(1): 105-124.
Mei Ming-Xiang. Giant ooids induced and predominated by photosynthetic biofilms of filamentous cyanobacteria: an example from the Miaolingian Xuzhuang Formation at the Shijing section in Xin'an County of Henan Province,North China Platform[J]. JOPC, 2021, 23(1): 105-124.
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