| 全新世古洪水事件光释光测年研究——以渭河下游临潼段为例 |
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| 关键词:OSL dating palaeoflood Holocene Weihe River |
| 基金项目:国家自然科学基金重点项目(编号: 41030637)；中央高校基本科研业务费专项基金(编号: GK200901007; GK200902020) |
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| OSL Dating of the Holocene Paleoflood Events: A Case Study of the Lintong Segment in the Lower Weihe River Valley |
| Field investigation was carried out in the lower Weihe River valley and, as a result, a Holocene loess-soil profile interbedded with flood slackwater deposits (SWD) was found in Lintong segment. The analytical results of grain-size distribution and magnetic susceptibility indicate that this profile has recorded the information of palaeoflood events that occurred during the Holocene. OSL dating of the samples from the profiles using the post-IR technique with the SAR protocol shows a linear relationship between the age and the depth. The extraordinary palaeofloods on the Weihe River were therefore dated at 3200-3000 a B.P. In combination with the stratigraphic correlation and climate proxy of grain-size distribution and magnetic susceptibility, the authors hold that extraordinary palaeofloods occurred just at the turning point from the middle Holocene climatic optimum to late Holocene dry conditions at about 3100 a B.P. The palaeofloods occurred because of the frequent climatic variation and the unstable atmospheric system in relation to the global climatic change. The catastrophic climate has resulted in both the extreme aridity and great palaeofloods. |
| WANG Heng-song,HUANG Chun-chang,ZHOU Ya-li,PANG Jiang-li,ZHA Xiao-chun,GU Hong-liang.2012.OSL Dating of the Holocene Paleoflood Events: A Case Study of the Lintong Segment in the Lower Weihe River Valley[J].Acta Geoscientica Sinica,33(2):227-235. |
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