Darriwilian-Sandbian (Middle-Late Ordovician) shallow warm-water deposits in the Upper Yangtze region, South China: A case study from the Qiaojia area, northeastern Yunnan Province

doi:10.1016/j.palwor.2022.09.003

	Darriwilian-Sandbian (Middle-Late Ordovician) shallow warm-water deposits in the Upper Yangtze region, South China: A case study from the Qiaojia area, northeastern Yunnan Province
	Luan, Xiao-Cong 1; Zhang, Xiao-Le 1; Li, Qi-Jian 1; Wang, Yong 1,2; Cui, Yu-Nong 1,2; Zhan, Ren-Bin 1,2
刊名	PALAEOWORLD
	2023-06-01
卷号	32 期号:2 页码:219-234
关键词	South China Ordovician microfacies lagoon warm-water deposits floral radiation
ISSN号	1871-174X
DOI	10.1016/j.palwor.2022.09.003
通讯作者	Luan, Xiao-Cong(xcluan@nigpas.ac.cn)
英文摘要	The Middle-Late Ordovician Nuoduo and Huadan formations are well exposed at Songliang of northeastern Yunnan Province, rep-resenting rare neritic carbonate sediments deposited in the Yangtze region, South China during that time. Detailed sedimentological analyses support the recognition of ten microfacies from the succession, including shale (MF 1), argillaceous mudstone/dolostone (MF 2), mollusk-ostracod wacke-packstone (MF 3), peloidal wacke-to pack-grainstone/dolostone (MF 4), ooid-cortoid-peloid pack-grainstone/dolostone (MF 5), peloidal bindstone (MF 6), bioclastic wacke-packstone (MF 7), green algae mud-wackestone to floatstone (MF 8), bioclast-lithoclast float-rudstone (MF 9) and green algae bindstone (MF 10). Types A, B and C of shallowing-upward sequences are constructed according to vertical associations of MFs. The Nuoduo Formation mainly comprises Type A and Type B, both being characterized by abundant peloids, ooids, cortoids and aggregate grains. MF 5 and MF 6 cap the Type A and Type B sequences, respec-tively, suggesting an overall restricted marine environment shifting cyclically from lagoon to shoal, or lagoon to tidal flat, respectively. Type C sequences, occurring in the topmost Nuoduo to Huadan formations, contain various green algae indicative of open-sea, euphotic subtidal zones. The transition from A and B to C sequences is marked by ferruginous ooidal intervals, possibly correlated to relative sea -level rise and/or tectonic activities. A continuous neritic, warm-water environment is proposed for this area from late Middle to Late Ordovician, with the Nuoduo Formation filling the absence of warm-water deposits in the tropical or subtropical Yangtze region during Middle Ordovician. The increasing diversity and abundance of green algae in the Huadan Formation might represent a global radiation event of marine flora during the studied interval. Unique fossils and environments distinct from those of the interior Yangtze region are documented here, leading to a better understanding of the Ordovician System regionally and globally.(c) 2022 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights reserved.
资助项目	National Natural Science Foundation of China[42102130] ; National Natural Science Foundation of China[41972011] ; Natural Science Foundation of Jiangsu Province[BK20191101] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; State Key Laboratory of Palaeobiology and Stratigraphy
WOS关键词	RESOLUTION SEQUENCE STRATIGRAPHY ; CARBONATE CYCLES ; STACKING PATTERNS ; PAGODA FORMATION ; TARIM BASIN ; FACIES ; EXAMPLES ; RAMP ; BIODIVERSIFICATION ; ICHNOGENUS
WOS研究方向	Paleontology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:001003121100001
资助机构	National Natural Science Foundation of China ; Natural Science Foundation of Jiangsu Province ; Strategic Priority Research Program of Chinese Academy of Sciences ; State Key Laboratory of Palaeobiology and Stratigraphy
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/42126]
专题	中国科学院南京地质古生物研究所
通讯作者	Luan, Xiao-Cong
作者单位	1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Ctr Excellence Life & Paleoenvironment, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Luan, Xiao-Cong,Zhang, Xiao-Le,Li, Qi-Jian,et al. Darriwilian-Sandbian (Middle-Late Ordovician) shallow warm-water deposits in the Upper Yangtze region, South China: A case study from the Qiaojia area, northeastern Yunnan Province[J]. PALAEOWORLD,2023,32(2):219-234.
APA	Luan, Xiao-Cong,Zhang, Xiao-Le,Li, Qi-Jian,Wang, Yong,Cui, Yu-Nong,&Zhan, Ren-Bin.(2023).Darriwilian-Sandbian (Middle-Late Ordovician) shallow warm-water deposits in the Upper Yangtze region, South China: A case study from the Qiaojia area, northeastern Yunnan Province.PALAEOWORLD,32(2),219-234.
MLA	Luan, Xiao-Cong,et al."Darriwilian-Sandbian (Middle-Late Ordovician) shallow warm-water deposits in the Upper Yangtze region, South China: A case study from the Qiaojia area, northeastern Yunnan Province".PALAEOWORLD 32.2(2023):219-234.