气候变化领域集成服务门户(CCPortal): Timing of rifting of the Dongkaco microcontinent (Central Tibet) and implications for Neo-Tethyan evolution

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DOI	10.1016/j.palaeo.2024.112054
	Timing of rifting of the Dongkaco microcontinent (Central Tibet) and implications for Neo-Tethyan evolution
	Ma, Anlin; Hu, Xiumian; Li, Xin; Pullen, Alex; Garzanti, Eduardo; Suzuki, Noritoshi
发表日期	2024
ISSN	0031-0182
EISSN	1872-616X
起始页码	638
卷号	638
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.
英文关键词	Rifting and sea-floor spreading; Late Paleozoic ice age; Detrital zircon; Radiolarian biostratigraphy; Bangong-Nujiang suture zone; Provenance analysis
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:001174286500001
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/288943
作者单位	Nanjing University; Chinese Academy of Sciences; Clemson University; University of Milano-Bicocca; Tohoku University
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],2024,638.
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.
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).