Paleoenvironmental implications of new OSL dates on the formation of the "Shell Bar" in the Qaidam Basin, northeastern Qinghai-Tibetan Plateau (SCI)
文献类型：期刊论文
| 作者 | Lai Z. P. ; Mischke S. ; Madsen D. |
| 刊名 | Journal of Paleolimnology
 |
| 出版日期 | 2014 |
| 卷号 | 51期号:2页码:197-210 |
| 英文摘要 | A geological feature in the Qaidam Basin known as the "Shell Bar" contains millions of freshwater clam shells buried in situ. Since the 1980s, this feature in the now hyper-arid basin has been interpreted to be lake deposits that provide evidence for a warmer and more humid climate than present during late marine isotope stage 3 (MIS 3). Global climate during late MIS 3 and the last glacial maximum, however, was cold and dry, with much lower sea levels. We re-investigated the feature geomorphologically and sedimentologically, and employed optically stimulated luminescence (OSL) dating to verify the chronology of the sediments. We interpret the Shell Bar to be a remnant of a river channel formed by a stream that ran across an exposed lake bed during a regressive lake phase. Deflation of the surrounding older, fine-grained lacustrine deposits has left the fluvial channel sediments topographically inverted, indicating the erosive nature of the landscape. Luminescence ages place the formation of the Shell Bar in MIS 5 (similar to 113-99 ka), much older than previous radiocarbon ages of < 40 ka BP, but place the paleoclimatic inferences more in accord with other regional and global climate proxy records. We present a brief review of the age differences derived from C-14 and OSL dating of some critical sections that were thought to represent a warmer and more humid climate than present during late MIS 3. We attribute the differences to underestimation of C-14 ages. We suggest that C-14 ages older than similar to 25 ka BP may require re-investigation, especially dates on samples from arid regions. |
| 收录类别 | SCI |
| 公开日期 | 2015-12-24 |
| 源URL | [http://ir.casnw.net/handle/362004/24905]  |
| 专题 | 寒区旱区环境与工程研究所_中科院寒区旱区环境与工程研究所（未分类）_期刊论文 |
| 推荐引用方式 GB/T 7714 | Lai Z. P.,Mischke S.,Madsen D.. Paleoenvironmental implications of new OSL dates on the formation of the "Shell Bar" in the Qaidam Basin, northeastern Qinghai-Tibetan Plateau (SCI)[J]. Journal of Paleolimnology,2014,51(2):197-210. |
| APA | Lai Z. P.,Mischke S.,&Madsen D..(2014).Paleoenvironmental implications of new OSL dates on the formation of the "Shell Bar" in the Qaidam Basin, northeastern Qinghai-Tibetan Plateau (SCI).Journal of Paleolimnology,51(2),197-210. |
| MLA | Lai Z. P.,et al."Paleoenvironmental implications of new OSL dates on the formation of the "Shell Bar" in the Qaidam Basin, northeastern Qinghai-Tibetan Plateau (SCI)".Journal of Paleolimnology 51.2(2014):197-210. |
入库方式： OAI收割
来源：寒区旱区环境与工程研究所
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