干旱区生态环境知识资源中心(Arid): Alluvial plains formation in response to 100-ka glacial-interglacial cycles since the Middle Pleistocene in the southern Tian Shan, NW China

Arid

DOI	10.1016/j.geomorph.2019.05.013
	Alluvial plains formation in response to 100-ka glacial-interglacial cycles since the Middle Pleistocene in the southern Tian Shan, NW China
	Huang, Weiliang 1,2,3; Yang, Xiaoping 3; Jobe, Jessica A. Thompson 4; Li, Shengqiang 3; Yang, Haibo 3; Zhang, Lin 3
通讯作者	Huang, Weiliang ; Yang, Xiaoping
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2019
卷号	341 页码:86-101
英文摘要	The tenet of the Milankovitch theory is that Northern Hemisphere solar insolation, controlled by Earth's orbital is responsible for cyclic climate variations. Eccentricity in this context is responsible for cyclic variability of 100 ka and may drive periodicity in climate change during the middle and late Pleistocene. Although abundant evidence exists for 100 ka cyclic climatic fluctuations driving glacial-interglacial cycles, our knowledge about the record of cyclic climatic changes preserved in terrestrial landscapes remains limited, especially over multi-millennial (several glacial-interglacial) timescales. The intermontane Yanqi Basin in the southeastern Tian Shan, Central Asia, preserves at least seven generations of alluvial surfaces spanning multiple glacial cycles and yields insights into the record of climatic fluctuations that lead to aggradation and incision of river systems. We complement existing chronologic data with two new cosmogenic Be-10 depth profiles and four surface exposure ages of alluvial surface abandonment in the south Tian Shan piedmont within the Yanqi Basin. New surface-exposure dating reveals the successive abandonment of these surfaces with a 100 ka cyclicity between 5.1 +/- 0.9 and similar to 550 ka and indicates that there were multiple aggradation-incision cycles. The superimposed 100 ka cycles of aggradation-incision are best explained by eccentricity-driven climate change. Within these cycles, sediment is produced during glaciations by glacial and periglacial erosion. However, due to the dry and cold conditions of the glacial periods in central Asia, there is little discharge available to transport and evacuate the sediment from the valleys to the piedmont. Later, during the glacial to interglacial transition, higher precipitation and high discharge due to glacial melt water resulted in higher transport capacity of the river beyond a threshold to evacuate sediment. Subsequent rapid incision occurs after the upstream sediment reservoir is depleted and its timing corresponds to the glacial to interglacial transition period in our study area. Compared with the aggradation and incision of the northern piedmont of the Tian Shan governed by the Westerlies, the sedimentary systems of the South Tian Shan piedmont within the Yanqi Basin are mainly controlled by eccentricity-driven glacial-interglacial cycles. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	Be-10 depth-profiles Glacial-interglacial cycles Tian Shan 100 ka-eccentricity Milankovitch cycle
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000476965100007
WOS关键词	BE-10 SURFACE EXPOSURE ; FLUVIAL TERRACE FORMATION ; DIGITAL ELEVATION MODELS ; DRIVEN VALLEY INCISION ; ROCK-VARNISH EVIDENCE ; ARID CENTRAL-ASIA ; LATE QUATERNARY ; TIEN-SHAN ; CLIMATE-CHANGE ; EROSION RATES
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216016
作者单位	1.Changan Univ, Coll Geol Engn & Surveying, Xian 710054, Shaanxi, Peoples R China; 2.Key Lab Western China Mineral Resources & Geol En, Xian 710054, Shaanxi, Peoples R China; 3.China Earthquake Adm, Inst Geol, Key Lab Act Tecton & Volcano, Beijing 100029, Peoples R China; 4.Colorado Sch Mines, Dept Geol & Geol Engn, Golden, CO 80401 USA
推荐引用方式 GB/T 7714	Huang, Weiliang,Yang, Xiaoping,Jobe, Jessica A. Thompson,et al. Alluvial plains formation in response to 100-ka glacial-interglacial cycles since the Middle Pleistocene in the southern Tian Shan, NW China[J],2019,341:86-101.
APA	Huang, Weiliang,Yang, Xiaoping,Jobe, Jessica A. Thompson,Li, Shengqiang,Yang, Haibo,&Zhang, Lin.(2019).Alluvial plains formation in response to 100-ka glacial-interglacial cycles since the Middle Pleistocene in the southern Tian Shan, NW China.GEOMORPHOLOGY,341,86-101.
MLA	Huang, Weiliang,et al."Alluvial plains formation in response to 100-ka glacial-interglacial cycles since the Middle Pleistocene in the southern Tian Shan, NW China".GEOMORPHOLOGY 341(2019):86-101.