气候变化领域集成服务门户(CCPortal): Geological records of the Lhasa-Qiangtang and Indo-Asian collisions in the Nima area of central Tibet

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DOI	10.1130/B26033.1
	Geological records of the Lhasa-Qiangtang and Indo-Asian collisions in the Nima area of central Tibet
	Kapp, Paul; DeCelles, Peter G.; Gehrels, George E.; Heizier, Matthew; Ding, Lin
发表日期	2007
ISSN	0016-7606
EISSN	1943-2674
起始页码	917
结束页码	932
卷号	119 期号:7-8
英文摘要	A geological and geochronologic investigation of the Nima area along the JurassicEarly Cretaceous Bangong suture of central Tibet (similar to 32 degrees N, similar to 87 degrees E) provides well-dated records of contractional deformation and sedimentation during mid-Cretaceous and mid-Tertiary time. Jurassic to Lower Cretaceous (:<= 125 Ma) marine sedimentary rocks were transposed, intruded by granitoids, and uplifted above sea level by ca. 118 Ma, the age of the oldest nonmarine strata documented. Younger nonmarine Cretaceous rocks include ca. 110-106 Ma volcanic-bearing strata and Cenomanian red beds and conglomerates. The Jurassic-Cretaceous rocks are unconformably overlain by up to 4000 m of Upper Oligocene to Lower Miocene lacustrine, nearshore lacustrine, and fluvial red-bed deposits. Paleocurrent directions, growth stratal relationships, and a structural restoration of the basin show that Cretaceous-Tertiary nonmarine deposition was coeval with mainly S-directed thrusting in the northern part of the Nima area and Ndirected thrusting along the southern margin of the basin. The structural restoration suggests > 58 km (> 47%) of N-S shortening following Early Cretaceous ocean closure and similar to 25 km shortening (similar to 28%) of Nima basin strata since 26 Ma. Cretaceous magmatism and syncontractional basin development are attributed to northward low-angle subduetion of the Neotethyan oceanic lithosphere and Lhasa-Qiangtang continental collision, respectively. Tertiary syncontractional basin development in the Nima area was coeval with that along the Bangong suture in west-ernmost Tibet and the Indus-Yarlung suture in southern Tibet, suggesting simultaneous, renewed contraction along these sutures during the Oligocene-Miocene. This suture-zone reactivation immediately predated major displacement within the Himalayan Main Central thrust system shear zone, raising the possibility that Tertiary shortening in Tibet and the Himalayas may be interpretable in the context of a mechanically linked, composite orogenic system.
关键词	HOH XIL BASIN FOLD-THRUST BELT TECTONIC EVOLUTION K-FELDSPAR TERTIARY DEFORMATION STRUCTURAL EVOLUTION SYSTEMATIC ANALYSIS MANTLE SUBDUCTION SOUTHERN TIBET EASTERN MARGIN
英文关键词	Tibet; plateau; thrust belt; Indo-Asian; collision; suture zone; basin development
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000247896000010
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/257496
推荐引用方式 GB/T 7714	Kapp, Paul,DeCelles, Peter G.,Gehrels, George E.,et al. Geological records of the Lhasa-Qiangtang and Indo-Asian collisions in the Nima area of central Tibet[J]. 中国科学院青藏高原研究所,2007,119(7-8).
APA	Kapp, Paul,DeCelles, Peter G.,Gehrels, George E.,Heizier, Matthew,&Ding, Lin.(2007).Geological records of the Lhasa-Qiangtang and Indo-Asian collisions in the Nima area of central Tibet.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,119(7-8).
MLA	Kapp, Paul,et al."Geological records of the Lhasa-Qiangtang and Indo-Asian collisions in the Nima area of central Tibet".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 119.7-8(2007).