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Tracking depositional and geochemical variations in the Cambrian North China Platform: Insights from sedimentology, geochemistry, and C-O isotopic records

文献类型：期刊论文

作者Riaz, Muhammad7,8,9; Jafarian, Arman10; Koeshidayatullah, Ardiansyah3; Frontalini, Fabrizio2; Jiang, Lei1; Latif, Khalid6; Zafar, Tehseen4,5
刊名SEDIMENTARY GEOLOGY
出版日期2023
卷号443页码:21
ISSN号0037-0738
关键词Carbonate microfacies Sequence stratigraphy Geochemistry Cambrian strata North China Platform
DOI10.1016/j.sedgeo.2022.106301
英文摘要The Cambrian carbonate sequence in North China is of significant global and regional scientific importance due to its continuous and thick exposure and the data on the major environmental changes and biological events of the early Phanerozoic, which can be gleaned from it. While the well-exposed Cambrian outcrops have been utilized to unravel the processes governing these events, few studies have focused on the outcrops' spatio-temporal depositional patterns and geochemical variations. Therefore, our study address, these issues by integrating fieldwork with petrographic and geochemical analyses. In the North China Platform (NCP), the Cambrian carbonate sequence is predominantly composed of six third-order depositional sequences (similar to 370-400 m thick) that can be divided into nine microfades, representing three primary microfades associations, namely tidal flat, lagoon, and shoal. In contrast to the standard carbonate sequence stratigraphy model and many other examples of Cambrian platforms, the deposition of oolitic grainstones in the NCP are overlain by the deep-water calcareous mudstone and shale during a period of slow fall of sea-levels. Such a particular style shows a similar trend to the Schlager model of a type III sequence boundary that formed between a highstand systems tract (HST) and a transgressive system tract (TST). Scanning electron microscope (SEM) observations show an abundance of microbial fossils, a nanosphere, and remnants of extracellular polymeric substances (EPS) inside the dark micrite of normal regressive deposits (oolitic grainstone), suggesting the significant role of microbial activity in the formation of ooids. The delta O-18 isotopic values range from -4.15 to -11.75 parts per thousand VPDB, portraying pervasive diagenetic alterations with a variable degree of diagenesis at different localities, and both marine- and burial-related diagenesis. In contrast the delta C-13 VPDB values have a very narrow range, from -2 to +2 parts per thousand VPDB, suggesting little to no influence of meteoric diagenesis. At the same time, the slight depletion of delta C-13 isotope values may reflect the role of microbial processes during the genesis of ooids. This study highlights the importance of microbial activity and marine-related diagenetic overprints during the formation of carbonate fades in the Cambrian Period and provides evidence that carbon isotopic excursions observed during different major environmental and biological events in the NCP are related to primary signals and not altered by intensive meteoric diagenesis. (C) 2022 Elsevier B.V. All rights reserved.
WOS关键词UPPER DALAN FORMATION ; SEA-LEVEL CHANGES ; SEQUENCE STRATIGRAPHY ; RESERVOIR QUALITY ; CARBONATE DIAGENESIS ; STACKING PATTERNS ; HYDROCARBON SEEP ; PERSIAN-GULF ; OOLITIC BANK ; GREAT-BASIN
资助项目National Natural Science Foundation of China ; [41472090]
WOS研究方向Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000901712300001
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
源URL[http://ir.iggcas.ac.cn/handle/132A11/106955]  
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Zafar, Tehseen
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.Univ Urbino Carlo Bo, Dipartimento Sci Pure & Applicate DiSPeA, Campus Sci,Local Crocicchia, I-61029 Urbino, Italy
3.King Fahd Univ Petr & Minerals, Coll Petr Engn & Geosci, Dept Geosci, Dhahran 31261, Saudi Arabia
4.Chinese Acad Sci, Inst Geochem, Guiyang 550081, Peoples R China
5.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
6.Univ Peshawar, Natl Ctr Excellence Geol, Peshawar 25130, Pakistan
7.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploitat, Chengdu 610059, Peoples R China
8.Chengdu Univ Technol, Coll Energy Resources, Chengdu 610059, Peoples R China
9.Hydrocarbon Dev Inst Pakistan, Islamabad, Pakistan
10.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714		 Riaz, Muhammad,Jafarian, Arman,Koeshidayatullah, Ardiansyah,et al. Tracking depositional and geochemical variations in the Cambrian North China Platform: Insights from sedimentology, geochemistry, and C-O isotopic records[J]. SEDIMENTARY GEOLOGY,2023,443:21.
APA Riaz, Muhammad.,Jafarian, Arman.,Koeshidayatullah, Ardiansyah.,Frontalini, Fabrizio.,Jiang, Lei.,...&Zafar, Tehseen.(2023).Tracking depositional and geochemical variations in the Cambrian North China Platform: Insights from sedimentology, geochemistry, and C-O isotopic records.SEDIMENTARY GEOLOGY,443,21.
MLA Riaz, Muhammad,et al."Tracking depositional and geochemical variations in the Cambrian North China Platform: Insights from sedimentology, geochemistry, and C-O isotopic records".SEDIMENTARY GEOLOGY 443(2023):21.

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来源：地质与地球物理研究所

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