Depositional environments, hematite-chamosite differentiation and origins of Middle Ordovician iron ooids in the Upper Yangtze region, South China

doi:10.1111/sed.13213

NIGPAS OpenIR

	Depositional environments, hematite-chamosite differentiation and origins of Middle Ordovician iron ooids in the Upper Yangtze region, South China
通讯作者	Luan, Xiaocong(xcluan@nigpas.ac.cn)
	Luan, Xiaocong1,2,3 ; Sproat, Colin D.3; Jin, Jisuo 4; Zhan, Renbin1,2,5
	2024-06-14
发表期刊	SEDIMENTOLOGY
ISSN	0037-0746
页码	38
摘要	Middle Ordovician iron ooids in the Upper Yangtze region of South China are composed mainly of hematite and/or chamosite, found in mixed siliciclastic and carbonate successions, with hematitic ooids occurring in the west, and predominantly chamositic ooids in the east of the study area. In the three iron ooid-bearing Middle-Upper Ordovician successions, 19 microfacies are recognized and grouped into eight facies associations, representing a shallow-water mosaic comprising restricted and semi-restricted lagoons, and open marine subtidal deposits interfingering with tidal flat and shoal facies. Hematitic ooids with well-sorted and well-rounded quartz grains formed in the transgressive shoal setting when the depositional environments changed from restricted lagoon to bioclast-quartz shoal and open marine subtidal. Episodic stasis and erosional intervals during transgression controlled the formation of hematite-rich and mixed hematite-chamosite laminae within the cortices of hematitic ooids. In contrast, chamositic ooids formed in a semi-restricted lagoonal environment, under long-term transgressive condensation. Alternating episodes of relatively oxic conditions with thriving organisms and eutrophication-driven anoxia resulted in the alternation of porous and dense laminae consisting mainly of chamosite in chamositic ooids. The stromatolite-like cauliflower structures associated with chamositic ooids suggest microbial activity that promoted iron concentration, similar to the origin of approximately coeval iron-rich oncoids in South China. Various iron ooid types demonstrate that these coated grains could form in a range of depositional setting and palaeooceanographic conditions on a generally shallow-marine platform during the Ordovician.
关键词	Chamosite ferruginous ooids hematite microfacies shallow-water mosaic transgression
DOI	10.1111/sed.13213
收录类别	SCI
语种	英语
关键词[WOS]	PAGODA FORMATION ; IRONSTONES ; BASIN ; PLATFORM ; BIODIVERSIFICATION ; CHEMOSTRATIGRAPHY ; STRATIGRAPHY ; HARDGROUNDS ; BAJOCIAN ; EXAMPLES
资助项目	National Natural Science Foundation of China[42102130] ; National Natural Science Foundation of China[41972011] ; Chinese Academy of Sciences[XDB26000000] ; China Scholarship Council[202004910207] ; State Key Laboratory of Palaeobiology and Stratigraphy ; Natural Sciences and Engineering Research Council of Canada
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:001247854300001
项目资助者	National Natural Science Foundation of China ; Chinese Academy of Sciences ; China Scholarship Council ; State Key Laboratory of Palaeobiology and Stratigraphy ; Natural Sciences and Engineering Research Council of Canada
出版者	WILEY
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/43872
专题	中国科学院南京地质古生物研究所
通讯作者	Luan, Xiaocong
作者单位	1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China 3.Univ Saskatchewan, Dept Geol Sci, Saskatoon, SK S7N 5A5, Canada 4.Western Univ, Dept Earth Sci, London, ON N6A 5B7, Canada 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Luan, Xiaocong,Sproat, Colin D.,Jin, Jisuo,et al. Depositional environments, hematite-chamosite differentiation and origins of Middle Ordovician iron ooids in the Upper Yangtze region, South China[J]. SEDIMENTOLOGY,2024:38.
APA	Luan, Xiaocong,Sproat, Colin D.,Jin, Jisuo,&Zhan, Renbin.(2024).Depositional environments, hematite-chamosite differentiation and origins of Middle Ordovician iron ooids in the Upper Yangtze region, South China.SEDIMENTOLOGY,38.
MLA	Luan, Xiaocong,et al."Depositional environments, hematite-chamosite differentiation and origins of Middle Ordovician iron ooids in the Upper Yangtze region, South China".SEDIMENTOLOGY (2024):38.