Optically stimulated luminescence dating of a moraine and a terrace in Laohugou valley, western Qilian Shan, northeastern Tibet

The Qilian Shan is one of the most important mountain ranges for understanding Quaternary glaciation in the northeastern Tibetan Plateau. However, its western part is not well studied. A moraine and an outwash terrace in the Laohugou valley were mapped, using geomorpho-stratigraphy, and dated by opt...

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Bibliographic Details
Published in:Quaternary International
Main Authors: Hu, Gang, Yi, Chao-Lu, Zhang, Jia-Fu, Liu, Jin-Hua, Jiang, Tao, Qin, Xiang
Other Authors: Yi, CL (reprint author), Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Bldg 3,Courtyard 16,Lin Cui Rd, Beijing 100101, Peoples R China., Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China., Peking Univ, Dept Geog, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China., China Univ Geosci, Minist Educ, Key Lab Tecton & Petr Resources, Wuhan 430074, Peoples R China., Chinese Acad Sci, Inst Environm & Engn Cold & Arid Reg, Qilian Shan Stn Glaciol & Ecol Environm, Lanzhou 73000, Peoples R China., Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Bldg 3,Courtyard 16,Lin Cui Rd, Beijing 100101, Peoples R China.
Format: Journal/Newspaper
Language:English
Published: quaternary international 2014
Subjects:
LATE QUATERNARY GLACIATIONS
REGENERATIVE-DOSE PROTOCOL
FLUVIAL SEDIMENTS
NORTHWEST CHINA
MOUNT EVEREST
COSMIC-RAY
ICE CORE
SINGLE
OSL
QUARTZ
Ela
ice core
Online Access:https://hdl.handle.net/20.500.11897/216513
https://doi.org/10.1016/j.quaint.2013.12.019
Description
Summary:The Qilian Shan is one of the most important mountain ranges for understanding Quaternary glaciation in the northeastern Tibetan Plateau. However, its western part is not well studied. A moraine and an outwash terrace in the Laohugou valley were mapped, using geomorpho-stratigraphy, and dated by optically stimulated luminescence. After analyzing the minimum age and central age of coarse- and fine-grained quartz, most of the minimum ages for coarse grains are consistent with geomorpho-stratigraphic sequence, indicating they are closest to the true ages of the sediments. The lateral moraine was initially formed at 20.2 +/- 2.6 ka, during the Last Glacial Maximum, and was modified between 11.6 +/- 2.0 and 12.9 +/- 1.3 ka, in the Late Glacial. The outwash terrace was formed between 10.0 +/- 1.7 and 5.5 +/- 0.7 ka, and coincides with temperature rise in the early Holocene and the Holocene Optimum. At its Last Glacial Maximum, the palaeo-glacier was similar to 13.6 km long with an area of 45.3 km(2), 4.3 km longer and 34% larger than the contemporary glacier. The reconstructed palaeo-glacier equilibrium line altitude (ELA) was 4600 +/- 40 m, or 140 m lower than the present ELA. The glacier advance in the Laohugou valley was less extensive and ELA depression was less than found in the eastern Qilian Shan during LGM and Late Glacial, suggesting a drier climate during the Last Glacial. (C) 2013 Elsevier Ltd and INQUA. All rights reserved. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000331853500006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 Geography, Physical Geosciences, Multidisciplinary SCI(E) 5 ARTICLE clyi@itpcas.ac.cn 37-49 321

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