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《Acta Sedimentologica Sinica》 2018-01
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Study on Characteristics and Geneses of Algal Dolostone of the Upper Sinian Dengying Formation in the Hanyuan-Ebian Area of Sichuan Province,China

LIN XiaoXian;PENG Jun;HOU ZhongJian;HAN HaoDong;LI XuJie;MA ChunJiang;Key Laboratory of Sedimentary Basin and Oil and Gas Resources,Ministry of Land and Resources;College of Resources and Environmental Engineering,Mianyang Teachers' College;College of Geosciences and Technology,Southwest Petroleum University;College of Earth Sciences,Chengdu University of Technology;  
Based on the macroscopic characteristics of profile,petrology and original structures,the microscopic characteristics of morphology and original textures of dolomite and microbial fossils and the corresponding geochemical characteristics,this paper studied the characteristics and geneses of algal dolostone of the Upper Sinian Dengying Formation in the Hanyuan-Ebian Area of Sichuan Province,China. The results show that the algal dolostone is a set of microbialites or microbial carbonates association formed in the tidal flat and lagoon,in which the laminated,stromatolithic,botryoidal and uniform( algal) dolostones are dominate. There are mainly two different texture and genesis types of dolomites,primary cryptocrystalline microbial dolomite and secondary fibrous mimetic dolomite. The geneses of the two types of dolomites are closely related to microbial biomineralization of Cyanobacteria,sulphate-reducing bacteria( SRB),moderately halophilic aerobic bacteria and red algae. In the precipitation and syngenetic stages,a large amount of nanometre-sized( pene-) cubical granular and( sub-) micron-sized sheeted dolomites is formed by microbially induced mineralization; meanwhile,fibrous aragonite and high-Mg calcite are developed. In the syngenetic and penecontemporaneous stages,nanometre-sized( spherulitic) granular and micron-sized irregular,spherical and ovoidal dolomites are formed by microbially influenced mineralization,in the meantime the fibrous aragonite and highMg calcite transform into the fibrous mimetic dolomite through microbially catalysed mineralization and mimetic dolomization. Then the microbial and mimetic dolomite form laminated stromatolithic and uniform dolostone together. The research of characteristics and geneses of algal dolostones is useful to comprehend the complexity and diversity of mineral-microbe interaction and process in this paper,and provides a new example of the investigation of microbial biomineralization,microbial dolomite and mimetic dolomite in the Precambrian era.
【Fund】: 国土资源部沉积盆地与油气资源重点实验室开放基金(zdsys2015002)~~
【CateGory Index】: P588.245;P618.13
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