气候变化领域集成服务门户(CCPortal): Late Cretaceous to middle Tertiary basin evolution in the central Tibetan Plateau: Changing environments in response to tectonic partitioning, aridification, and regional elevation gain

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DOI	10.1130/B26074.1
	Late Cretaceous to middle Tertiary basin evolution in the central Tibetan Plateau: Changing environments in response to tectonic partitioning, aridification, and regional elevation gain
	DeCelles, P. G.; Kapp, P.; Ding, L.; Gehrels, G. E.
发表日期	2007
ISSN	0016-7606
EISSN	1943-2674
起始页码	654
结束页码	680
卷号	119 期号:5-6
英文摘要	Located in the Bangong suture zone between the Lhasa and Qiangtang terranes of central Tibet, the Nima basin records Cretaceous-late Miocene sediment accumulation during a period of drastically changing paleogeography and paleoelevation. The Bangong suture zone originally formed during Late Jurassic-Early Cretaceous time as the Lhasa terrane collided with the Qiangtang terrane. During Early to middle Cretaceous time, the region lay at northern near equatorial paleolatitudes, near sea level. By Aptian time the Nima basin was above sea level and was strongly influenced by nearby volcanic activity and crustal shortening in the reactivated Bangong suture zone. In the southern Nima basin, an similar to 50 m.y. (Late Cretaceous-Eocene) depositional hiatus correlates with major crustal shortening and ensuing voluminous ignimbrite eruptions in the Lhasa terrane. In the northern Nima basin, deposition continued during latest Cretaceous time, recording arid paleoclimate in evaporitic lacustrine and eolian dune-field deposits. By Oligocene time the Nima basin comprised two independent depocenters that accumulated coarse-grained alluvial, fluvial, lacustrine (evaporitic), and fan-delta deposits in close association with reactivated thrusts in the Bangong suture zone. Carbon and oxygen isotope data from Oligocene paleosol carbonate, reported elsewhere, indicate that regional paleoelevation during the late Oligocene was > 4.6 km, as it is today. Overall, the depositional record of the Nima basin, combined with ongoing structural and geochronologic studies, demonstrates that the Bangong suture zone was reactivated during middle Cretaceous and middle Tertiary time, that the intervening similar to 50 m.y. interval was a time of regional upper crustal shortening in the Lhasa terrane followed by regional ignimbrite eruptions, and that arid paleoclimate and high paleoelevation were established by the Late Cretaceous and late Oligocene, respectively. Within the context of other data sets from the Lhasa terrane, the record of deposition in the Nima basin is consistent with low-angle subduction of Neotethyan oceanic lithosphere and reactivation of the Bangong suture zone during the Early Cretaceous, followed by shortening within the Gangdese retroarc and northern Lhasa terrane thrust belts during the Late Cretaceous, lithospheric delamination-dripping and regional magmatic flare-up during latest Cretaceous through early Tertiary time, and underthrusting of Indian lower crust and lithosphere as far north as the Bangong suture zone during late Oligocene time.
关键词	EAST-WEST EXTENSION KICKING-HORSE-RIVER FOLD-THRUST BELT SOUTHERN TIBET ALLUVIAL-FAN STRUCTURAL EVOLUTION SUTURE ZONE DEPOSITIONAL SYSTEMS THAKKHOLA GRABEN FAULT SYSTEM
英文关键词	Tibet; arid paleoclimate; paleogeography; Cretaceous; Tertiary; sedimentary basins
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000247630200010
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/257472
推荐引用方式 GB/T 7714	DeCelles, P. G.,Kapp, P.,Ding, L.,et al. Late Cretaceous to middle Tertiary basin evolution in the central Tibetan Plateau: Changing environments in response to tectonic partitioning, aridification, and regional elevation gain[J]. 中国科学院青藏高原研究所,2007,119(5-6).
APA	DeCelles, P. G.,Kapp, P.,Ding, L.,&Gehrels, G. E..(2007).Late Cretaceous to middle Tertiary basin evolution in the central Tibetan Plateau: Changing environments in response to tectonic partitioning, aridification, and regional elevation gain.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,119(5-6).
MLA	DeCelles, P. G.,et al."Late Cretaceous to middle Tertiary basin evolution in the central Tibetan Plateau: Changing environments in response to tectonic partitioning, aridification, and regional elevation gain".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 119.5-6(2007).