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  4. 中国科学院新生代地质与环境重点实验室
Palaeo-environmental significance of fibrous carbonate cement in Marinoan cap carbonates

文献类型：期刊论文

作者Hu, Yongjie6; Cai, Chunfang7,8; Sun, Peng1,9; Zhang, Hong6; Liu, Zixuan6; Li, Ying2; Wang, Qiang3; Tang, Youjun1,9; Immenhauser, Adrian4,5
刊名MARINE AND PETROLEUM GEOLOGY
出版日期2023-09-01
卷号155页码:14
ISSN号0264-8172
关键词Ediacaran Cap dolostone Fibrous dolomite cement Early diagenetic porewater Dolomitisation
DOI10.1016/j.marpetgeo.2023.106392
英文摘要Marinoan cap carbonates are the first sedimentary rocks deposited after the Marinoan Snowball Earth glaciation and likely record the marine geochemical signals across the Cryogenian-Ediacaran boundary. The nature of the parent fluids, the possible precursor mineralogies and the dolomitisation models of these carbonates are debated to the present day. Cap carbonates and their fibrous dolomite cement samples from the Jiulongwan and Huajipo sections in South China were analysed for their petrography and geochemistry. Data obtained shed light on the deposition and alteration history of cap carbonates. Two types of fibrous dolomite cement precipitated pene-contemporaneously with platform carbonate sediment deposition: (i) isopachous fascicular-optic dolomite fab-rics with a characteristic botryoidal habit and mottled cathodoluminescence colour; they likely formed via an aragonitic precursor; and (ii) radial-slow dolomite cement, representing a direct marine precipitate. Growth zones are recognised under the SEM and visible in alternating dull-and bright-red zones under the cath-odoluminescence microscope. Basal cap carbonates (Ce anomalies: 0.85 & PLUSMN; 0.11; Mn: 3324.3 & PLUSMN; 558.2 ppm) and the base (Ce anomalies: 0.83 & PLUSMN; 0.22; Mn: 2349.2 & PLUSMN; 1276.4 ppm) of fascicular-optic dolomite cement from platform facies indicate anoxic marine seawater with high Mn concentrations. Based on the geochemical data of fibrous dolomite and blocky calcite cement, the marine porewater evolved from the Mn reduction zone (Ce anomalies: 1.04 & PLUSMN; 0.26) to the sulphate reduction zone (Ce anomalies: 1.00 & PLUSMN; 0.48) and the Fe reduction zone (Ce anomaly: 1.40). In situ trace and rare earth elemental contents and the transition from a dull to bright fluorescence colour along the fibrous dolomite transects point to the former activity of microbial sulphate reduction and the degradation of organic matter. These two factors likely facilitated the formation of cap dolostone and multiphase dolomite cement crusts in a marine seawater (porewater) environment. Data shown here are significant for those concerned with the palaeoenvironmental archive and the dolomitisation process of Marinoan cap dolostones.
WOS关键词RARE-EARTH-ELEMENTS ; ISOTOPE CONSTRAINTS ; TRACE-ELEMENTS ; TRANSVAAL SUPERGROUP ; HYDROTHERMAL ORIGIN ; METHANE SEEPS ; SOUTH CHINA ; DOLOMITE ; DOLOMITIZATION ; GEOCHEMISTRY
资助项目National Natural ScienceFoundation of China[41961144023] ; National Natural ScienceFoundation of China[41730424]
WOS研究方向Geology
语种英语
出版者ELSEVIER SCI LTD
WOS记录号WOS:001036633800001
资助机构National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China ; National Natural ScienceFoundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/111329]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Cai, Chunfang; Sun, Peng
作者单位1.Environm Yangtze Univ, Coll Resource, Wuhan 430100, Peoples R China
2.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
3.China Petr & Chem Corp Sinopec, Beijing 100728, Peoples R China
4.Ruhr Univ Bochum, Fac Geosci, Bochum, Germany
5.Fraunhofer Inst Energy Infrastruct & Geothermal Sy, IEG, Bochum, Germany
6.Sinopec Int Petr Explorat & Prod Corp, Beijing 100029, Peoples R China
7.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
8.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
9.Yangtze Univ, Key Lab Explorat Technol Oil & Gas Resources, Minist Educ, Wuhan 430100, Peoples R China
推荐引用方式
GB/T 7714		 Hu, Yongjie,Cai, Chunfang,Sun, Peng,et al. Palaeo-environmental significance of fibrous carbonate cement in Marinoan cap carbonates[J]. MARINE AND PETROLEUM GEOLOGY,2023,155:14.
APA Hu, Yongjie.,Cai, Chunfang.,Sun, Peng.,Zhang, Hong.,Liu, Zixuan.,...&Immenhauser, Adrian.(2023).Palaeo-environmental significance of fibrous carbonate cement in Marinoan cap carbonates.MARINE AND PETROLEUM GEOLOGY,155,14.
MLA Hu, Yongjie,et al."Palaeo-environmental significance of fibrous carbonate cement in Marinoan cap carbonates".MARINE AND PETROLEUM GEOLOGY 155(2023):14.

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来源：地质与地球物理研究所

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