Timing of rifting of the Dongkaco microcontinent (Central Tibet) and implications for Neo-Tethyan evolution

doi:10.1016/j.palaeo.2024.112054

	Timing of rifting of the Dongkaco microcontinent (Central Tibet) and implications for Neo-Tethyan evolution
	Ma, Anlin 5; Hu, Xiumian 5; Li, Xin 4; Pullen, Alex 3; Garzanti, Eduardo 2; Suzuki, Noritoshi 1
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2024-03-15
卷号	638 页码:11
关键词	Rifting and sea-floor spreading Late Paleozoic ice age Detrital zircon Radiolarian biostratigraphy Bangong-Nujiang suture zone Provenance analysis
ISSN号	0031-0182
DOI	10.1016/j.palaeo.2024.112054
通讯作者	Hu, Xiumian(huxm@nju.edu.cn)
英文摘要	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.
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关键词	NUJIANG SUTURE ZONE ; U-PB GEOCHRONOLOGY ; HIGH-MG ANDESITES ; TECTONIC EVOLUTION ; TETHYS HIMALAYA ; BASEMENT ROCKS ; LHASA TERRANE ; SOUTH TIBET ; BREAK-UP ; AREA
WOS研究方向	Physical Geography ; Geology ; Paleontology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:001174286500001
资助机构	National Natural Science Foundation of China ; Yuxiu Young Scholars Program of Nanjing University, Jiangsu Funding Program for Excellent Postdoctoral Talent
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/43514]
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.Tohoku Univ, Grad Sch Sci, Dept Earth Sci, Sendai, 9808578, Japan 2.Univ Milano Bicocca, Dept Earth & Environm Sci, I-20126 Milan, Italy 3.Clemson Univ, Dept Environm Engn & Earth Sci, Clemson, SC 29634 USA 4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China 5.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposit Res, Nanjing 210023, Peoples R China
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.