气候变化领域集成服务门户(CCPortal): Late Cenozoic deformation and uplift of the NE Tibetan plateau: Evidence from high-resolution magneto stratigraphy of the Guide Basin, Qinghai Province, China

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DOI	10.1130/B25727.1
	Late Cenozoic deformation and uplift of the NE Tibetan plateau: Evidence from high-resolution magneto stratigraphy of the Guide Basin, Qinghai Province, China
	Fang, XM; Yan, MD; Van der Voo, R; Rea, DK; Song, CH; Pares, JM; Gao, JP; Nie, JS; Dai, S
发表日期	2005
ISSN	0016-7606
EISSN	1943-2674
起始页码	1208
结束页码	1225
卷号	117 期号:9-10
英文摘要	The Cenozoic intramontane Gonghe-Guide Basin in Qinghai Province, China, is tectonically controlled by the sinistral strike-slip framework of the Kunlun and Altyn Tagh-South Qilian faults in the northeastern Tibetan Plateau. The basin is filled with thick Cenozoic clastic sedimentary formations, which provide important evidence of the deformation of this part of the plateau, although they have long lacked good age constraints. Detailed magnetostratigraphic and paleontologic investigations of five sections in the Guide Basin and their lithologic and sedimentary characteristics allow us to divide a formerly undifferentiated unit (the Guide Group) into six formations (where ages are now magnetostratigraphically well established, they are given in parentheses): the Amigang (1.8-2.6 Ma), Ganjia (2.6-3.6 Ma), and Herjia formations (3.6 to ca. 7.0-7.8 Ma), and the older Miocene Ashigong, Garang, and Guidemen formations. These rocks document a generally upward coarsening sequence, characterized by increasing accumulation rates. Increasing gravel content and sizes of its components, changes of bedding dips and source rock types, and marginal growth faults collectively reflect accelerated deformation and uplift of the NE Tibetan Plateau after 8 Ma, punctuated by a sharp increase in sedimentation rate at ca. 3.2 Ma that reflects the boulder conglomerates of the Ganjia formation. Interestingly, much of the vergence of the compressional deformation in the basin is to the south, accommodated by a sequence of six thrusts (F1-F6), which become active one by one progressively later toward the south, undoubtedly contributing to the uplift of this part of the plateau. F1 likely initiated the Guide Basin due to crustal flexure in the Oligocene, F2 was active in the early Miocene, F4 and FS at ca. 3.6 Ma, and F6 was active in the early Pleistocene. The detailed late Miocene and younger magnetostratigraphy allows us to place much improved time constraints on the deformation and, hence, uplift of northeastern Tibet, which, when compared with ages for events on other parts of the plateau, provides important boundary conditions for the geodynamical evolution of Tibet.
关键词	ALTYN-TAGH FAULT APATITE FISSION-TRACK EASTERN QILIAN SHAN NORTHEASTERN MARGIN AUTONOMOUS REGION HEXI CORRIDOR HAIYUAN FAULT MAGNETOSTRATIGRAPHY GANSU TECTONICS
英文关键词	Tibet; Neogene; magnetostratigraphy; Qinghai Province; plateau uplift
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000231587300007
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257387
推荐引用方式 GB/T 7714	Fang, XM,Yan, MD,Van der Voo, R,et al. Late Cenozoic deformation and uplift of the NE Tibetan plateau: Evidence from high-resolution magneto stratigraphy of the Guide Basin, Qinghai Province, China[J]. 中国科学院青藏高原研究所,2005,117(9-10).
APA	Fang, XM.,Yan, MD.,Van der Voo, R.,Rea, DK.,Song, CH.,...&Dai, S.(2005).Late Cenozoic deformation and uplift of the NE Tibetan plateau: Evidence from high-resolution magneto stratigraphy of the Guide Basin, Qinghai Province, China.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,117(9-10).
MLA	Fang, XM,et al."Late Cenozoic deformation and uplift of the NE Tibetan plateau: Evidence from high-resolution magneto stratigraphy of the Guide Basin, Qinghai Province, China".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 117.9-10(2005).