| Spatio-temporal distribution of Quaternary loess across Central Asia | |
Song, Yougui1,2 ; Li, Yue1; Cheng, Liangqing1; Zong, Xiulan1; Kang, Shugang1; Ghafarpour, Amin3; Li, Xinzhou1; Sun, Huanyu1; Fu, Xiaofen1; Dong, Jibao1; Mamadjanov, Yunus4; Orozbaev, Rustam5,6; Shukurov, Nosir7; Gholami, Hamid8; Shukurov, Shukhrat7; Xie, Mengping1
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| Corresponding Author | Song, Yougui(ygsong@loess.llqg.ac.cn) |
| 2021-04-01 | |
| Source Publication | PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
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| ISSN | 0031-0182 |
| Volume | 567Pages:23 |
| Abstract | Central Asia (CA) is one of the main loess regions in the world and provides important information for the understanding of paleoclimate and paleoenvironmental changes. However, the spatio-temporal variability of the loess distribution is still not fully understood. Combining previous studies with our recent field investigations, we focus on the spatial distribution and ages of loess sediments in CA. Loess sediments are mainly distributed on the windward piedmonts of Central Asian high mountains, e.g. the Tianshan Mountains, Kunlun Mountains, and river terraces, with distinct pedogenic characteristics. The distribution of loess sediments is not only related to atmospheric circulations and regional climate but also closely related to landforms. Based on field observations and the pedogenic environment, we recommend that the loess distribution should be divided into three subregions (Western CA, Northern CA, and Eastern CA), which are approximately coincident with the 60% and 30% winter-half year's precipitation percentage contours, and also correspond to three loess depocenters with thicknesses over 200 m. Paleomagnetic, luminescence dating and AMS C-14 geochronology indicated that most of the loess outcrops have developed since the last interglacial-glacial period; although CA loess sediments can span the entire Quaternary period and even extend into the Pliocene. AMS C-14 can provide reliable ages for the last 25-30 kyr. Quartz OSL and K-feldspar post-infrared infrared stimulated luminescence (pIRIR) dating techniques, based on well-bleached natural environmental materials, can provide reliable ages younger than 80 ka. The luminescence ages of older samples may be underestimated due to signal saturation problems. Dating of deposits at some elevated locations in CA shows rapid and discontinuous deposition, implying that caution is required in the interpretation of proxies and paleoenvironment. Spatial-temporal distributions of Central Asian loess luminescence ages indicate different clusters in different loess subregions, but generally the periods of strong dust activity occurred during cold glacial periods or stadials. New dating techniques should be developed to enable high-resolution paleoclimate reconstruction. |
| Keyword | Geochronology Palaeomagnetism Luminescence dating AMS C-14 Dust activities Regional differentiation Tianshan Mountains |
| DOI | 10.1016/j.palaeo.2021.110279 |
| Indexed By | SCI ; SCI |
| Language | 英语 |
| Funding Project | Natural Science Foundation of China[41977385] ; Natural Science Foundation of China[41572162] ; Second Tibetan Plateau Scientific Expedition and Research program[2019QZKK0101] ; State Key Laboratory of Loess and Quaternary Geology[SKLLQGPY2006] ; International Partnership Program of the Chinese Academy of Sciences |
| WOS Research Area | Physical Geography ; Geology ; Paleontology |
| Funding Organization | Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research program ; State Key Laboratory of Loess and Quaternary Geology ; International Partnership Program of the Chinese Academy of Sciences |
| WOS Subject | Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology |
| WOS ID | WOS:000636761000035 |
| Publisher | ELSEVIER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ieecas.cn/handle/361006/16244 |
| Collection | 古环境研究室 第四纪科学与全球变化卓越创新中心 |
| Corresponding Author | Song, Yougui |
| Affiliation | 1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 2.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 3.Gorgan Univ Agr Sci & Nat Resources, Dept Soil Sci, Gorgan 4913815739, Golestan, Iran 4.Res Ctr Ecol & Environm Cent Asia Dushanbe, Dushanbe 734063, Tajikistan 5.Res Ctr Ecol & Environm Cent Asia Bishkek, Bishkek 720040, Kyrgyzstan 6.Natl Acad Sci Kyrgyz Republ, Inst Geol, Bishkek 720040, Kyrgyzstan 7.Inst Geol & Geophys, State Comm Republ Uzbekistan Geol & Mineral Resou, Tashkent 100041, Uzbekistan 8.Univ Hormozgan, Agr Engn & Nat Resource, Bandar Abbas, Hormozgan, Iran |
| Recommended Citation GB/T 7714 | Song, Yougui,Li, Yue,Cheng, Liangqing,et al. Spatio-temporal distribution of Quaternary loess across Central Asia[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2021,567:23. |
| APA | Song, Yougui.,Li, Yue.,Cheng, Liangqing.,Zong, Xiulan.,Kang, Shugang.,...&Xie, Mengping.(2021).Spatio-temporal distribution of Quaternary loess across Central Asia.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,567,23. |
| MLA | Song, Yougui,et al."Spatio-temporal distribution of Quaternary loess across Central Asia".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 567(2021):23. |
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