Tectonics and Topography of the Tibetan Plateau in Early Miocene

doi:10.1111/1755-6724.12205

	Tectonics and Topography of the Tibetan Plateau in Early Miocene
	Wu Zhenhan 4; Yang Yan ; Barosh, Patrick J.; Wu Zhonghai 2; Zhang Yaoling 2
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	2014
卷号	88 期号:2 页码:410-424
关键词	Lacustrine deposits vast lakes elevation change regional thrust system Early Miocene Tibetan Plateau
ISSN号	1000-9515
DOI	10.1111/1755-6724.12205
英文摘要	Early Miocene stratigraphy, major structural systems, magmatic emplacement, volcanic eruption, vegetation change and paleo-elevation were analyzed for the Tibetan Plateau after regional geological mapping at a scale of 1:250,000 and related researches, revealing much more information for tectonic evolution and topographic change of the high plateau caused by Indian-Asian continental collision. Lacustrine deposits of dolostone, dolomite limestone, limestone, marl, sandstone and conglomerate of weak deformation formed extensively in the central Tibetan Plateau, indicating that vast lake complexes as large as 100,000-120,000 km(2) existed in the central plateau during Early Miocene. Sporopollen assemblages contained in the lacustrine strata indicate the disappearance of most tropical-subtropical broad-leaved trees since Early Miocene and the flourishing of dark needle-leaved trees during Early Miocene. Such vegetation changes adjusted for latitude and global climate variations demonstrate that the central Tibetan Plateau rose to ca. 4,000-4,500 m and the northeastern plateau uplifted to ca. 3,500-4,000 m before the Early Miocene. Intensive thrust and crustal thickening occurred in the areas surrounding central Tibetan Plateau in Early Miocene, formed Gangdise Thrust System (GTS) in the southern Lhasa block, Zedong-Renbu Thrust (ZRT) in the northern Himalaya block, Main Central Thrust (MCT) and Main Boundary Thrust (MBT) in the southern Himalaya block, and regional thrust systems in the Qaidam, Qilian, West Kunlun and Songpan-Ganzi blocks. Foreland basins formed in Early Miocene along major thrust systems, e.g. the Siwalik basin along MCT, Yalung-Zangbu Basin along GTS and ZRT, southwestern Tarim depression along West Kunlun Thrust, and large foreland basins along major thrust systems in the northeastern margin of the plateau. Intensive volcanic eruptions formed in the Qiangtang, Hoh-Xil and Kunlun blocks, porphyry granites and volcanic eruptions formed in the Nainqentanglha and Gangdise Mts., and leucogranites and granites formed in the Himalaya and Longmenshan Mts. in Early Miocene. The K2O weight percentages of Early Miocene magmatic rocks in the Gangdise and Himlayan Mts. are found to increase with distance from the MBT, indicating the genetic relationship between regional magmatism and subduction of Indian continental plate in Early Miocene.
学科主题	构造地质学
WOS关键词	SOUTHERN TIBET ; NORTHERN TIBET ; THRUST BELT ; CONTINENTAL SUBDUCTION ; LATE OLIGOCENE ; LHASA BLOCK ; SHEAR ZONE ; EVOLUTION ; UPLIFT ; REGION
WOS研究方向	Geology
语种	英语
出版者	WILEY-BLACKWELL
WOS记录号	WOS:000335451300004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41074]
专题	中国地质科学院
作者单位	1.Chinese Acad Geol Sci, Beijing 100037, Peoples R China 2.Barosh, Patrick J.] PJ Barosh & Associates, Bristol, RI 02809 USA 3.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China 4.中国地质科学院（院部）
推荐引用方式 GB/T 7714	Wu Zhenhan,Yang Yan,Barosh, Patrick J.,et al. Tectonics and Topography of the Tibetan Plateau in Early Miocene[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2014,88(2):410-424.
APA	Wu Zhenhan,Yang Yan,Barosh, Patrick J.,Wu Zhonghai,&Zhang Yaoling.(2014).Tectonics and Topography of the Tibetan Plateau in Early Miocene.ACTA GEOLOGICA SINICA-ENGLISH EDITION,88(2),410-424.
MLA	Wu Zhenhan,et al."Tectonics and Topography of the Tibetan Plateau in Early Miocene".ACTA GEOLOGICA SINICA-ENGLISH EDITION 88.2(2014):410-424.