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Genesis of Silica-phosphatic Nodules with Small Shelly Fossils Preserved in the Lowermost Cambrian of South China

文献类型：期刊论文

作者Qiu Hao4,5; Feng Lianjun4,5; Chu Xuelei4,5; Li Luoyang3; Zhang Xingliang1,2; Li Jinhua4,5
刊名ACTA GEOLOGICA SINICA-ENGLISH EDITION
出版日期2022-08-01
卷号96期号:4页码:1294-1307
ISSN号1000-9515
关键词silica-phosphatic nodule small shelly fossils Yanjiahe Formation taphonomy Cambrian
DOI10.1111/1755-6724.14924
英文摘要Silica-phosphatic nodules are abundant in black shales of the Yanjiahe Formation in the Three Gorges Area of South China, which is correlated to the Fortunian Stage, Terreneuvian Series, Cambrian System. The nodules are rich in small shelly fossils and hence attract the attention of numerous paleontologists and sedimentary geologists. However, the genesis of the nodules and the preservation of the small shelly fossils are poorly understood. Here we analyze morphological, structural, mineralogical and chemical features of the nodules in multiscale using a combination of micro-X-ray fluorescence spectroscopy, X-ray diffraction, scanning electron microscopy and confocal laser Raman spectroscopy. Results reveal that nodules are concentric in chemical and mineralogical compositions, comprising a silica-phosphatic core encrusted sequentially by a phosphatic zone, a siliceous zone and a very thin pyrite outer rim. The black shales hosting the nodules demonstrate a laminated texture of alternating clayey and silty laminae, which were respectively deposited in sulfidic/less sulfidic, high/low production, intense/weak chemical weathering conditions. The phosphogenesis of the nodules resulted in the phosphatization of small shelly fossils, which prevented the fossils from being dissolved during diagenesis, whereas the silica encrustation sealed the fossils within the nodules and thus protected the fossils from alteration by deep burial and surface weathering.
WOS关键词YANJIAHE FORMATION ; DOUSHANTUO FORMATION ; YANGTZE PLATFORM ; BLACK-SEA ; PYRITE ; PHOSPHORUS ; PHOSPHOGENESIS ; GEOCHEMISTRY ; SEDIMENTS ; BOUNDARY
资助项目National Natural Science Foundation of China[41890843] ; National Natural Science Foundation of China[41920104009] ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)[311021003]
WOS研究方向Geology
语种英语
出版者WILEY
WOS记录号WOS:000847531600014
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 ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)
源URL[http://ir.iggcas.ac.cn/handle/132A11/108392]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Zhang Xingliang; Li Jinhua
作者单位1.Northwest Univ, Dept Geol, Shaanxi Key Lab Early Life & Environm, Xian 710069, Peoples R China
2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
3.Ocean Univ China, Key Lab Submarine Geosci & Prospecting Tech, Minist Educ, Coll Marine Geosci, Qingdao 266100, Shandong, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Qiu Hao,Feng Lianjun,Chu Xuelei,et al. Genesis of Silica-phosphatic Nodules with Small Shelly Fossils Preserved in the Lowermost Cambrian of South China[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2022,96(4):1294-1307.
APA Qiu Hao,Feng Lianjun,Chu Xuelei,Li Luoyang,Zhang Xingliang,&Li Jinhua.(2022).Genesis of Silica-phosphatic Nodules with Small Shelly Fossils Preserved in the Lowermost Cambrian of South China.ACTA GEOLOGICA SINICA-ENGLISH EDITION,96(4),1294-1307.
MLA Qiu Hao,et al."Genesis of Silica-phosphatic Nodules with Small Shelly Fossils Preserved in the Lowermost Cambrian of South China".ACTA GEOLOGICA SINICA-ENGLISH EDITION 96.4(2022):1294-1307.

入库方式： OAI收割

来源：地质与地球物理研究所

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