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	Timing of rifting of the Dongkaco microcontinent (Central Tibet) and implications for Neo-Tethyan evolution
通讯作者	Hu, Xiumian(huxm@nju.edu.cn)
	Ma, Anlin1; Hu, Xiumian1; Li, Xin2; Pullen, Alex3; Garzanti, Eduardo4; Suzuki, Noritoshi5
	2024-03-15
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN	0031-0182
卷号	638页码:11
摘要	Rifting of continental blocks away from northern Gondwana resulted in the development of several Tethyan oceanic branches, the number of which and the timing of tectonic processes are actively debated. Within the Mesozoic Bangong-Nujiang suture, locally exposed Paleozoic strata are potential witnesses of the early development of Tethyan basins, yet their origin and tectonic significance remain poorly understood. In this study, Paleozoic limestone and sandstone units exposed in the Dongkaco area are identified as part of an independent Dongkaco microcontinent, differentiated from the South Qiangtang terrane by the Dongqiao suture on the north and from the Lhasa Block by the Beila suture on the south. The Upper Paleozoic deltaic to shallow-marine feldspatho-quartzose and quartzose sandstones within the microcontinent are interbedded with glaciogenic sequences and exhibit provenance characteristics that align with the Lhasa Block. These stratigraphic and provenance features suggest that during the Carboniferous to Early Permian the Dongkaco microcontinent was attached to the Lhasa Block. The discovery of Middle Triassic (Anisian) radiolarian chert associated with the Beila ophiolite indicates that sea-floor spreading was active within the Beila Ocean at that time. Data presented here show that the detachment of the Dongkaco microcontinent from the Lhasa Block resulted in the Beila Ocean, a branch of Bangong-Nujiang Ocean that expanded through Middle Permian to Early Triassic times. These findings shed new light on the paleogeographic evolution that preceded India-Asia collision and final amalgamation of the Himalayan-Tibetan orogen.
关键词	Rifting and sea-floor spreading Late Paleozoic ice age Detrital zircon Radiolarian biostratigraphy Bangong-Nujiang suture zone Provenance analysis
DOI	10.1016/j.palaeo.2024.112054
收录类别	SCI
语种	英语
关键词[WOS]	NUJIANG SUTURE ZONE ; U-PB GEOCHRONOLOGY ; HIGH-MG ANDESITES ; TECTONIC EVOLUTION ; TETHYS HIMALAYA ; BASEMENT ROCKS ; LHASA TERRANE ; SOUTH TIBET ; BREAK-UP ; AREA
资助项目	National Natural Science Foundation of China[41888101] ; National Natural Science Foundation of China[42002120] ; Yuxiu Young Scholars Program of Nanjing University, Jiangsu Funding Program for Excellent Postdoctoral Talent[2022ZB14]
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:001174286500001
项目资助者	National Natural Science Foundation of China ; Yuxiu Young Scholars Program of Nanjing University, Jiangsu Funding Program for Excellent Postdoctoral Talent
出版者	ELSEVIER
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/43515
专题	中国科学院南京地质古生物研究所
通讯作者	Hu, Xiumian
作者单位	1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposit Res, Nanjing 210023, Peoples R China 2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 3.Clemson Univ, Dept Environm Engn & Earth Sci, Clemson, SC 29634 USA 4.Univ Milano Bicocca, Dept Earth & Environm Sci, I-20126 Milan, Italy 5.Tohoku Univ, Grad Sch Sci, Dept Earth Sci, Sendai, 9808578, Japan
推荐引用方式 GB/T 7714	Ma, Anlin,Hu, Xiumian,Li, Xin,et al. Timing of rifting of the Dongkaco microcontinent (Central Tibet) and implications for Neo-Tethyan evolution[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2024,638:11.
APA	Ma, Anlin,Hu, Xiumian,Li, Xin,Pullen, Alex,Garzanti, Eduardo,&Suzuki, Noritoshi.(2024).Timing of rifting of the Dongkaco microcontinent (Central Tibet) and implications for Neo-Tethyan evolution.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,638,11.
MLA	Ma, Anlin,et al."Timing of rifting of the Dongkaco microcontinent (Central Tibet) and implications for Neo-Tethyan evolution".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 638(2024):11.

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