气候变化领域集成服务门户(CCPortal): Preservation of a large-scale bedrock peneplain suggests long-term landscape stability in southern Tibet

CCPortal

DOI	10.1127/0372-8854/2010/0054-0023
	Preservation of a large-scale bedrock peneplain suggests long-term landscape stability in southern Tibet
	Strobl, M.; Hetzel, R.; Ding, L.; Zhang, L.; Hampel, A.
通讯作者	Strobl, M (通讯作者)
发表日期	2010
ISSN	0372-8854
起始页码	453
结束页码	466
卷号	54 期号:4
英文摘要	Extensive areas with low relief constitute the dominant geomorphic element of the central and southern Tibetan Plateau and were previously interpreted to result from the progressive filling of internally drained basins with sediments derived from adjacent mountain ranges that have been largely eroded. Here we document a completely different low-relief landscape in the Lhasa block of southern Tibet (similar to 31 degrees N, similar to 90 degrees E), where a large-scale peneplain carved into Cretaceous granitoids is well preserved north of lake Nam. Around the town of Bangoin this bedrock peneplain occurs at a constant elevation of similar to 5,300 m in a region not affected by active faulting. The main planation surface has been incised by streams resulting in a local relief of up to 700 m. Progressive fluvial incision generated additional flat bedrock surfaces of limited extent that occur at lower elevations than the peneplain. Local hillslope gradients in the peneplain region increase with decreasing elevation, which is in marked contrast to the morphology of nearby mountain ranges that are uplifted in the footwall blocks of active normal faults. The subsiding hanging walls of these normal faults provide the necessary accomodation space for the sediment produced by erosion of the peneplain region. These relations demonstrate that the bedrock peneplain is the most stable geomorphic element present in southern Tibet.
关键词	LHASA BLOCK PLATEAU MIOCENE GEOTRAVERSE ELEVATION MAGMATISM HISTORY BASINS GOLMUD UPLIFT
英文关键词	Tibetan Plateau; peneplain; landscape evolution
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000285173700003
来源期刊	ZEITSCHRIFT FUR GEOMORPHOLOGIE
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/257808
推荐引用方式 GB/T 7714	Strobl, M.,Hetzel, R.,Ding, L.,et al. Preservation of a large-scale bedrock peneplain suggests long-term landscape stability in southern Tibet[J]. 中国科学院青藏高原研究所,2010,54(4).
APA	Strobl, M.,Hetzel, R.,Ding, L.,Zhang, L.,&Hampel, A..(2010).Preservation of a large-scale bedrock peneplain suggests long-term landscape stability in southern Tibet.ZEITSCHRIFT FUR GEOMORPHOLOGIE,54(4).
MLA	Strobl, M.,et al."Preservation of a large-scale bedrock peneplain suggests long-term landscape stability in southern Tibet".ZEITSCHRIFT FUR GEOMORPHOLOGIE 54.4(2010).