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Growing pattern of mega-dunes in the Badain Jaran Desert in China revealed by luminescence ages
Liu, SiWen1,2; Lai, ZhongPing3; Wang, YiXuan4; Fan, XiaoLu5; Wang, LuLin5; Tian, MingZhong5; Jiang, YaDong6; Zhao, Hua7
AbstractSand dunes up to 400 m high are common in the Badain Jaran Desert in China, but how and why megadunes grow remains unclear. Timing is the most critical to clarify this issue. The chronological data are still limited with only a few C-14 ages from carbonate, not the direct age of the dune, and a few thermoluminescence (TL) ages whose unbleachable residual signals may result in uncertainty in age. Optically stimulated luminescence (OSL) dating uses quartz or feldspars and thus directly dates the sands. It could also be completely reset by daylight with no residual signals. We here report for the first time a batch of OSL ages, and discuss the pattern of the mega-dune growth. Field observation showed that wet sand layers could be exposed in the slope surface and could be easily seen due to its wetness and calcareous cement, causing stronger resistance to wind deflation relative to the adjacent sands. Wet sand layers are normally situated on the mega-dune windward slope, and sometimes could even be seen near the top of a mega-dune, with well-preserved original bedding layers, making them the ideal locations for collecting luminescence samples. Our four OSL samples collected from the Barunbaoritaolegai sand mountain (BSM) show that OSL ages are 4.4 +/- 0.5, 5.6 +/- 0.5, 11.9 +/- 0.9, and 125 +/- 11 ka, respectively, from top to bottom. These ages are concentrated in the early to middle Holocene and the Last Inter-glaciation (corresponding to MIS 5e). Based on field observation and OSL ages, we propose that the mega-dunes grow mostly during humid periods with water as cementing agents to build up the sands. The issues, such as the source of the water, how the water seeps into the high sand dunes, how the loose sands could build up to mega-height, etc., require further study. (C) 2015 Elsevier Ltd and INQUA. All rights reserved.
KeywordMega-dunes In The badaIn Jaran Desert In chIna Osl Dating Pattern Of Mega-dune Growth
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaPhysical Geography ; Geology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000383790700010
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Document Type期刊论文
Affiliation1.Natl Res Ctr Geoanal, Beijing 100037, Peoples R China
2.Minist Land & Resources, Key Lab Ecogeochem, Beijing 100037, Peoples R China
3.China Univ Geosci, Sch Earth Sci, Wuhan 430074, Peoples R China
4.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
5.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
6.Inner Mongolia Geol Environm Monitoring, Hohhot 010020, Peoples R China
7.CAGS, Inst Hydrogeol & Environm Geol, Shijiazhuang 050061, Peoples R China
Recommended Citation
GB/T 7714
Liu, SiWen,Lai, ZhongPing,Wang, YiXuan,et al. Growing pattern of mega-dunes in the Badain Jaran Desert in China revealed by luminescence ages[J]. QUATERNARY INTERNATIONAL,2016,410:111-118.
APA Liu, SiWen.,Lai, ZhongPing.,Wang, YiXuan.,Fan, XiaoLu.,Wang, LuLin.,...&Zhao, Hua.(2016).Growing pattern of mega-dunes in the Badain Jaran Desert in China revealed by luminescence ages.QUATERNARY INTERNATIONAL,410,111-118.
MLA Liu, SiWen,et al."Growing pattern of mega-dunes in the Badain Jaran Desert in China revealed by luminescence ages".QUATERNARY INTERNATIONAL 410(2016):111-118.
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