OSL Dating of the Holocene Paleoflood Events: A Case Study of the Lintong Segment in the Lower Weihe River Valley
详细信息
- 责任者：Wang Hengsong (College of Tourism and Environmental Sciences ; Shaanxi Normal University ; Xi’an ; Shaanxi 710062 ; China) ; Huang Chunchang
- 刊名：Acta Geoscientica Sinica
- 出版年：2012
- 卷期：33(2)
- 关键词：全新世 ; Holocene ; 光释光测年 ; optical stimulated luminescence dating ; 渭河 ; Weihe River
- 页码：p.227-235
- 图表：7 illus., 1 table, 39 refs.
- 分类号：1400
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
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.
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