Chronological dating and tectonic implications of late Cenozoic volcanic rocks and lacustrine sequence in Oiyug Basin of southern Tibet

doi:10.1007/s11430-008-0007-6

	Chronological dating and tectonic implications of late Cenozoic volcanic rocks and lacustrine sequence in Oiyug Basin of southern Tibet
	Chen Hehai 1,2; Han JingTai 1; Ding ZhongLi 1; Sun HuiGuo 1; Guo ZhengFu 1
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2008-02-01
卷号	51 期号:2 页码:275-283
关键词	southern Tibet Oiyug Basin late Cenozoic paleomagnetic dating K-Ar dating
ISSN号	1006-9313
DOI	10.1007/s11430-008-0007-6
文献子类	Article
英文摘要	Reconstruction of uplift history of the Tibetan Plateau is crucial for understanding its environmental impacts. The Oiyug Basin in southern Tibet contains multiple periods of sedimentary sequences and volcanic rocks that span much of the Cenozoic and has great potential for further studying this issue. However, these strata were poorly dated. This paper presents a chronological study of the 145 m thick and horizontally-distributed lacustrine sequence using paleomagnetic method as well as a K-Ar dating of the underlying volcanic rocks. Based on these dating results, a chronostratigraphic framework and the basin-developmental history have been established for the past 15 Ma, during which three tectonic stages are identified. The period of 15-8.1 Ma is characterized by intense volcanic activities involving at least three major eruptions. Subsequently, the basin came into a tectonically quiescent period and a lacustrine sedimentary sequence was developed. Around 2.5 Ma, an N-S fault occurred across the southern margin of the basin, leading to the disappearance of the lake environment and the development of the Oiyug River. The Gyirong basin on northern slope of the Himalayas shows a similar basin developmental history and thus there is a good agreement in tectonic activities between the Himalayan and Gangdise orogenic belts. Therefore, the tectonic evolution stages experienced by the Oiyug Basin during the past 15 Ma could have a regional significance for southern Tibet. The chronological data obtained from this study may provide some constraints for further studies with regard to the tectonic processes and environmental changes in southern Tibetan Plateau.
WOS关键词	EAST-WEST EXTENSION ; UPLIFT ; PLATEAU ; MIOCENE ; CLIMATE ; PALEOALTIMETRY ; SENSITIVITY ; EVOLUTION ; HIMALAYA ; AGE
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000252470400012
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/69750]
专题	中国科学院地质与地球物理研究所
通讯作者	Han JingTai
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Beilun Entry Exit Inspect & Quarantine Bur China, Ningbo 315800, Peoples R China
推荐引用方式 GB/T 7714	Chen Hehai,Han JingTai,Ding ZhongLi,et al. Chronological dating and tectonic implications of late Cenozoic volcanic rocks and lacustrine sequence in Oiyug Basin of southern Tibet[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2008,51(2):275-283.
APA	Chen Hehai,Han JingTai,Ding ZhongLi,Sun HuiGuo,&Guo ZhengFu.(2008).Chronological dating and tectonic implications of late Cenozoic volcanic rocks and lacustrine sequence in Oiyug Basin of southern Tibet.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,51(2),275-283.
MLA	Chen Hehai,et al."Chronological dating and tectonic implications of late Cenozoic volcanic rocks and lacustrine sequence in Oiyug Basin of southern Tibet".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 51.2(2008):275-283.