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Subject: 地理学::自然地理学
Title: Cosmogenic Be-10 constraints on Little Ice Age glacial advances in the eastern Tian Shan, China
Author: Li, YA (Li, Yanan)1; Li, YK (Li, Yingkui)2; Harbor, J (Harbor, Jon)3; Liu, GN (Liu, Gengnian)4; Yi, CL (Yi, Chaolu)5; Caffee, MW (Caffee, Marc W.)3, 6
Corresponding Author: Li, YK
Source: QUATERNARY SCIENCE REVIEWS
Issued Date: 2016
DOI: 10.1016/j.quascirev.2016.02.023
Volume: 138, Issue:0, Pages:105-118
Indexed Type: SCI
Cooperation Status: 国际
DOC Type: Article
English Abstract: Presumed Little Ice Age (LIA) glacial advances, represented by a set of fresh, sharp-crested, boulder covered and compact moraines a few hundred meters downstream from modern glaciers, have been widely recognized in the Central Asian highlands. However, few studies have constrained the formation ages of these moraines. We report 31 Be-10 exposure ages from presumed LIA moraines in six glacial valleys in the Urumqi River headwater area and the Haxilegen Pass area of the eastern Tian Shan, China. Our results reveal that the maximum LIA glacial extent occurred mainly around 430 +/- 100 yr, a cold and wet period as indicated by proxy data from ice cores, tree rings, and lake sediments in Central Asia. We also dated a later glacial advance to 270 +/- 55 yr. However, Be-10 exposure ages on several presumed LIA moraines in front of small, thin glaciers are widely scattered and much older than the globally recognized timing of the LIA. Historical topographic maps indicate that most glaciers were more extensive in the early 19605, and two of our Be-10 sample sites were located close to the ice front at that time. Boulders transported by these small and thin glaciers may be reworked from deposits originally formed prior to the LIA glacial advances, producing apparently old and widely scattered exposure ages due to varied nuclide inheritance. Other published ages indicated an earlier LIA advance around 790 +/- 300 yr in the easternmost Tian Shan, but in our study area the more extensive advance around 430 +/- 100 yr likely reworked or covered deposits from this earlier event. (C) 2016 Elsevier Ltd. All rights reserved.
Language: 英语
WOS ID: WOS:000374369700009
Citation statistics:
Content Type: 期刊论文
URI: http://ir.itpcas.ac.cn/handle/131C11/7717
Appears in Collections:图书馆_期刊论文

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description.institution: 1.S Dakota State Univ, Dept Geog, Brookings, SD 57007 USA
2.Univ Tennessee, Dept Geog, Knoxville, TN 37996 USA
3.Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA
4.Peking Univ, Coll Urban & Environm Sci, Beijing 100871, Peoples R China
5.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China
6.Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA

Recommended Citation:
Li, YA ,Li, YK ,Harbor, J ,et al. Cosmogenic Be-10 constraints on Little Ice Age glacial advances in the eastern Tian Shan, China[J]. QUATERNARY SCIENCE REVIEWS,2016,138(0):105-118.
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