气候变化领域集成服务门户(CCPortal): A 10Be-based paleo-erosion record for the Qilian Shan (NE Tibet) over the past 4.2 Ma from a drillcore in the Hexi Corridor

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DOI	10.1016/j.geomorph.2023.108657
	A 10Be-based paleo-erosion record for the Qilian Shan (NE Tibet) over the past 4.2 Ma from a drillcore in the Hexi Corridor
	Zhang, Jian; Hetzel, Ralf; Pan, Baotian; Geng, Haopeng; Wolff, Reinhard; Chen, Dianbao
发表日期	2023
ISSN	0169-555X
EISSN	1872-695X
卷号	430
英文摘要	Knowledge of erosion rates through time is of great importance to understand the effects of tectonics and climate on the topographic evolution of mountain belts. In this study, we present a 10Be-based paleo-erosion record for the northern Qilian Shan (NE Tibet) during the last 4.2 Ma. This new record is based on samples from a mag-netostratigraphically dated drillcore from the foreland of the northern Qilian Shan (i.e., the Hexi Corridor). The 10Be-based paleo-erosion rates obtained from the drillcore lie between-40 and-150 m/Ma, with the exception of two transient peaks at-3.4 Ma (-330 m/Ma) and-2.0 Ma (-220 m/Ma). These high values may result from transitions to a generally cooler climate with more pronounced changes between glacial and interglacial periods. Apart from these peak values, erosion rates during the period from 4.2 to 2.8 Ma are rather low (-40 to-70 m/ Ma; mean: 50 m/Ma), whereas erosion rates over the last-1.5 Ma are higher, ranging from-80 to-150 m/Ma (mean:-112 m/Ma). We attribute the slower erosion between 4.2 and 2.8 Ma to a warmer climate, with more rainfall than today, and a lower relief in the sediment-source region. These factors led to a stabilization of hillslopes and caused erosion rates to be low. Subsequently, progressive cooling, aridification, and enhanced glacial and periglacial processes reduced the vegetation cover and increased hillslope erosion. In addition, ongoing rock uplift and concomitant river incision in the Qilian Shan may have increased the local relief. These factors explain the higher erosion rates in the past-1.5 Ma. Available evidence on tectonic boundary conditions, drainage evolution, sedimentary environment, and paleo-climate conditions suggest that the geomorphology of the northern Qilian Shan has not significantly changed over that period.
关键词	Paleo-erosion rate Cosmogenic (10) Be Qilian Shan Hexi corridor Tibet
英文关键词	WESTERN QAIDAM BASIN; DENUDATION RATES; CLIMATE-CHANGE; TECTONIC EVOLUTION; COSMOGENIC RADIONUCLIDES; PALEOEROSION RATES; GLACIAL EROSION; PLATEAU; BE-10; GROWTH
WOS研究方向	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000966141500001
来源期刊	GEOMORPHOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282975
作者单位	Lanzhou University; University of Munster
推荐引用方式 GB/T 7714	Zhang, Jian,Hetzel, Ralf,Pan, Baotian,et al. A 10Be-based paleo-erosion record for the Qilian Shan (NE Tibet) over the past 4.2 Ma from a drillcore in the Hexi Corridor[J],2023,430.
APA	Zhang, Jian,Hetzel, Ralf,Pan, Baotian,Geng, Haopeng,Wolff, Reinhard,&Chen, Dianbao.(2023).A 10Be-based paleo-erosion record for the Qilian Shan (NE Tibet) over the past 4.2 Ma from a drillcore in the Hexi Corridor.GEOMORPHOLOGY,430.
MLA	Zhang, Jian,et al."A 10Be-based paleo-erosion record for the Qilian Shan (NE Tibet) over the past 4.2 Ma from a drillcore in the Hexi Corridor".GEOMORPHOLOGY 430(2023).