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Upper Ediacaran fibrous dolomite versus Ordovician fibrous calcite cement: Origin and significance as a paleoenvironmental archive

文献类型：期刊论文

作者Hu, Yongjie2; Cai, Chunfang3,4; Li, Ying1; Zhou, Rui2; Lu, Fuchang2; Hu, Junfeng2; Ren, Chaobo2; Jia, Lianqi7,8; Zhou, Yuanquan4; Lippert, Kevin5
刊名CHEMICAL GEOLOGY
出版日期2022-10-20
卷号609页码:17
ISSN号0009-2541
关键词Ediacaran Ordovician Fibrous dolomite cement Fibrous calcite cement PHREEQC modeling
DOI10.1016/j.chemgeo.2022.121065
英文摘要Fibrous carbonate cement is a common phase in marine phreatic environments - but its origin and diagenetic history are underexplored. This paper compares two fibrous fabrics that are different in terms of their pecu-liarities but share important similarities regarding their essentials: upper Ediacaran fibrous dolomite cement and Upper Ordovician fibrous calcite cement, both from the Tarim Basin, China. The focus is on the significance of these fabrics as archives of their marine paleoenvironment. Upper Ediacaran fibrous dolomite cement is present as (i) a fascicular-optic and (ii) a radial-fibrous phase. Judging from the optical length-slow character and luminescent zones, radial-fibrous dolomite cement precipitated directly from early diagenetic marine porewater. Fascicular-optic dolomite cement has a length fast optical character and hence likely formed as a high-Mg calcite precursor penecontemporaneously in a reefal, shallow-marine diagenetic environment. Similarly, two types of Upper Ordovician fibrous cement are present: (i) radiaxial-fibrous and (ii) fascicular-optic calcite cement. Fascicular-optic calcite precipitated in a marine phreatic platform environment, whereas radiaxial-fibrous calcite cement formed in an early marine diagenetic porewater environment. Both fabrics arguably replace a magnesium calcite precursor. For the case of the Tarim Basin, cathodoluminescence and redox-sensitive elements indicate predominantly anoxic, upper Ediacaran marine waters (Ce anomaly = 0.8 +/- 0.2), and suboxic, Upper Ordovician shallow-marine seawater (0.7 +/- 0.2). Based on PHREEQC modeling, the shallow burial, upper Ediacaran porewater (5.1) yields a higher dolomite saturation index than upper Ediacaran (4.8) and Upper Ordovician seawater (3.7). The direct precipitation of radial-fibrous dolomite from Ediacaran porewaters was likely induced due to organic matter decomposition and related seawater oxygen depletion, elevated Mg2+/Ca2+ ratios, and high alkalinity values. Modeling and proxy data show significant hydrogeochemical differences between seawater and porewater in the upper meters of the sediment column. The upper Ediacaran seawater apparently favored fibrous cement formation with magnesium calcite precursors. In contrast, fibrous dolomite cement was directly precipitated in an early-diagenetic marine porewater regime. The comparability of proxy data reflecting seawater and such recording early diagenetic marine porewater is critically discussed.
WOS关键词RARE-EARTH-ELEMENTS ; PLASMA-MASS-SPECTROMETRY ; BECK SPRING DOLOMITE ; TRACE-ELEMENT ; OIL-FIELD ; CARBONATE DIAGENESIS ; MICROBIAL CARBONATE ; SEAWATER CHEMISTRY ; ALTERNATIVE MODEL ; TARIM BASIN
资助项目National Natural Science Foundation of China[41730424] ; National Natural Science Foundation of China[41961144023]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:000851373400001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/108376]  
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; Immenhauser, Adrian
作者单位1.Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
2.Sinopec Int Petr Explorat & Prod Corp, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
5.Fraunhofer Res Inst Energy Infrastruct & Geotherma, Bochum, Germany
6.Ruhr Univ Bochum, Fac Geosci, Bochum, Germany
7.Northwest Univ, State Key Lab Continental Dynam, Xian 710069, Peoples R China
8.Northwest Univ, Dept Geol, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Hu, Yongjie,Cai, Chunfang,Li, Ying,et al. Upper Ediacaran fibrous dolomite versus Ordovician fibrous calcite cement: Origin and significance as a paleoenvironmental archive[J]. CHEMICAL GEOLOGY,2022,609:17.
APA Hu, Yongjie.,Cai, Chunfang.,Li, Ying.,Zhou, Rui.,Lu, Fuchang.,...&Immenhauser, Adrian.(2022).Upper Ediacaran fibrous dolomite versus Ordovician fibrous calcite cement: Origin and significance as a paleoenvironmental archive.CHEMICAL GEOLOGY,609,17.
MLA Hu, Yongjie,et al."Upper Ediacaran fibrous dolomite versus Ordovician fibrous calcite cement: Origin and significance as a paleoenvironmental archive".CHEMICAL GEOLOGY 609(2022):17.

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来源：地质与地球物理研究所

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