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Formation, diagenesis and palaeoenvironmental significance of upper Ediacaran fibrous dolomite cements

文献类型：期刊论文

作者Hu, Yongjie1,4,5,6; Cai, Chunfang1,3,4,5; Liu, Dawei1,4,5; Pederson, Chelsea L.6; Jiang, Lei1,5; Shen, Anjiang2; Immenhauser, Adrian6
刊名SEDIMENTOLOGY
出版日期2019-12-06
页码27
关键词Dolomite geochemistry Ediacaran euxinic marine porewater LA-ICP-MS NanoSIMS suboxic seawater
ISSN号0037-0746
DOI10.1111/sed.12683
英文摘要Neoproterozoic marine dolomite cements represent reliable, albeit complex, archives of their palaeoenvironment. Petrological and high-resolution geochemical data from well-preserved fibrous dolomite and pyrite in the upper Ediacaran (ca 551 center dot 1 to 548 center dot 0 Ma) Dengying Formation in south-west China are presented and discussed here. The aim of this research is to reconstruct the redox state of late Ediacaran shallow seawater and porewater in the Sichuan Basin using early marine diagenetic fabrics. Based on crystalline texture and axis, four basic types of fibrous dolomite cements formed penecontemporaneously in a microbialite reef setting at the platform margin: (i) bladed dolomites (replacement from a high-Mg calcite precursor); (ii) fascicular fast dolomites (replacement from an aragonitic precursor); (iii) fascicular slow dolomites; and (iv) radial slow dolomites. The latter two fabrics are considered direct marine porewater precipitates due to their length-slow character, cathodoluminescent zonation, and enriched copper and cobalt concentrations. Marine cements yield rare earth element and yttrium patterns comparable to modern seawater and represent a refined set of archive data relative to previously published bulk dolostones. Redox-sensitive elements and cathodoluminescence indicate that the fascicular fast dolomites formed in suboxic seawater, while fascicular slow and radial slow dolomites formed in euxinic marine porewaters. Microbial sulphate reduction during the formation of fascicular slow and radial slow dolomites is recognized by nanometre-scale spheroidal ankerite and sulphur-containing dolomite, and intergrown pyrite grains with U-shaped delta S-34 transects. Data shown here suggest predominantly suboxic shallow late Ediacaran seawater and euxinic marine porewaters, with microbial activity promoting the direct precipitation of dolomite.
WOS关键词RARE-EARTH-ELEMENTS ; SINIAN DENGYING FORMATION ; BECK SPRING DOLOMITE ; SOUTH CHINA ; SULFATE REDUCTION ; SICHUAN BASIN ; MICROBIAL MEDIATION ; CAMBRIAN TRANSITION ; REEFAL CARBONATES ; REDOX CONDITION
资助项目Natural Science Foundation of China[41730424] ; Natural Science Foundation of China[41672143] ; Natural Science Foundation of China[2017ZX05008003-040]
WOS研究方向Geology
语种英语
WOS记录号WOS:000500954700001
出版者WILEY
资助机构Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China ; Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/95813]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Cai, Chunfang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.PetroChina Hangzhou Res Inst Geol, Hangzhou 310023, Zhejiang, Peoples R China
3.Yangtze Univ, Key Lab Explorat Technol Oil & Gas Resources, Minist Educ, Wuhan 430100, Hubei, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
6.Ruhr Univ Bochum, Inst Geol Mineral & Geophys, Univ Str 150, D-44801 Bochum, Germany
推荐引用方式
GB/T 7714		 Hu, Yongjie,Cai, Chunfang,Liu, Dawei,et al. Formation, diagenesis and palaeoenvironmental significance of upper Ediacaran fibrous dolomite cements[J]. SEDIMENTOLOGY,2019:27.
APA Hu, Yongjie.,Cai, Chunfang.,Liu, Dawei.,Pederson, Chelsea L..,Jiang, Lei.,...&Immenhauser, Adrian.(2019).Formation, diagenesis and palaeoenvironmental significance of upper Ediacaran fibrous dolomite cements.SEDIMENTOLOGY,27.
MLA Hu, Yongjie,et al."Formation, diagenesis and palaeoenvironmental significance of upper Ediacaran fibrous dolomite cements".SEDIMENTOLOGY (2019):27.

入库方式： OAI收割

来源：地质与地球物理研究所

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