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Paleoenvironmental implications of new OSL dates on the formation of the "Shell Bar" in the Qaidam Basin, northeastern Qinghai-Tibetan Plateau
文献类型：期刊论文
| 作者 | Lai, ZhongPing1,2 ; Mischke, Steffen3,4; Madsen, David5
|
| 刊名 | JOURNAL OF PALEOLIMNOLOGY
 |
| 出版日期 | 2014-02-01 |
| 卷号 | 51期号:2页码:197-210 |
| 关键词 | Osl Dating Depositional Origin Paleoenvironmental Change Late Pleistocene Shell Bar Qaidam Basin Qinghai-tibetan Plateau (Qtp) |
| 文献子类 | Article |
| 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. |
| WOS关键词 | CHINESE LOESS PLATEAU ; REGENERATIVE-DOSE PROTOCOL ; MARINE ISOTOPE STAGE-3 ; LATE QUATERNARY ; WESTERN CHINA ; GROWTH-CURVE ; LUMINESCENCE CHRONOLOGY ; NORTHWESTERN CHINA ; LATE PLEISTOCENE ; NORTHERN CHINA |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Marine & Freshwater Biology |
| 语种 | 英语 |
| WOS记录号 | WOS:000330734400004 |
| 源URL | [http://ir.isl.ac.cn/handle/363002/5659]  |
| 专题 | 青海盐湖研究所_青海盐湖研究所知识仓储 中国科学院青海盐湖研究所 |
| 作者单位 | 1.Chinese Acad Sci, Qinghai Inst Salt Lakes, CAS Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China 2.Chinese Acad Sci, State Key Lab Cryosphere Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China 3.Univ Potsdam, Inst Earth & Environm Sci, D-14476 Potsdam, Germany 4.Free Univ Berlin, Inst Geol Sci, D-12249 Berlin, Germany 5.Univ Texas Austin, Texas Archeol Res Lab, Austin, TX 78712 USA |
| 推荐引用方式 GB/T 7714 | Lai, ZhongPing,Mischke, Steffen,Madsen, David. Paleoenvironmental implications of new OSL dates on the formation of the "Shell Bar" in the Qaidam Basin, northeastern Qinghai-Tibetan Plateau[J]. JOURNAL OF PALEOLIMNOLOGY,2014,51(2):197-210. |
| APA | Lai, ZhongPing,Mischke, Steffen,&Madsen, David.(2014).Paleoenvironmental implications of new OSL dates on the formation of the "Shell Bar" in the Qaidam Basin, northeastern Qinghai-Tibetan Plateau.JOURNAL OF PALEOLIMNOLOGY,51(2),197-210. |
| MLA | Lai, ZhongPing,et al."Paleoenvironmental implications of new OSL dates on the formation of the "Shell Bar" in the Qaidam Basin, northeastern Qinghai-Tibetan Plateau".JOURNAL OF PALEOLIMNOLOGY 51.2(2014):197-210. |
入库方式： OAI收割
来源：青海盐湖研究所
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