地理研究 ›› 2012, Vol. 31 ›› Issue (10): 1837-1848.doi: 10.11821/yj2012100010

• 地球信息科学 • 上一篇    下一篇

关中盆地杨官寨遗址古洪水事件释光测年

顾洪亮1,2, 黄春长2, 周亚利2, 庞奖励2, 查小春2, 张玉柱2   

  1. 1. 安庆师范学院资源环境学院, 安庆246002;
    2. 陕西师范大学旅游与环境学院, 西安710062
  • 收稿日期:2011-12-13 修回日期:2012-06-02 出版日期:2012-10-10 发布日期:2012-10-10
  • 通讯作者: 黄春长(1954-),男,陕西人,教授,博士生导师,主要从事全球变化与环境演变研究。E-mail:cchuang@snnu.edu.cn E-mail:cchuang@snnu.edu.cn
  • 作者简介:顾洪亮(1986-),男,四川人,助教,硕士,研究方向为资源开发与环境演变。E-mail:ufoghl@126.com
  • 基金资助:

    国家自然科学基金资助项目(41030637、40930103、40771018);中央高校基本科研业务费专项基金(GK200902020)

OSL dating study on the palaeoflood events recorded in the Yangguanzhai Neolithic ruins in the Guanzhong Basin

GU Hong-liang1,2, HUANG Chun-chang2, ZHOU Ya-li2, PANG Jiang-li2, ZHA Xiao-chun2, ZHANG Yu-zhu2   

  1. 1. School of Resources and Envinonment, Anqing Normal University, Anqing 246002, China;
    2. College of Tourism and Environmental Sciences, Shaanxi Normal University, Xi'an 710062, China
  • Received:2011-12-13 Revised:2012-06-02 Online:2012-10-10 Published:2012-10-10

摘要: 通过对泾河下游的野外考察, 在高陵县杨官寨仰韶文化遗址东南部发现夹有典型的古洪水滞流沉积层的全新世黄土-古土壤剖面。利用单片再生剂量法(SAR)测定了40~63μm粒径石英的光释光(OSL)年龄。从剖面获得的样品年龄数值处在2.27±0.06ka到14.26±0.58ka之间, 且与地层深度表现出良好的对应关系。通过样品OSL年龄与其埋深的关系, 结合粒度和磁化率数据地层对比, 以及文化层考古年龄, 确定了该全新世剖面的基本年代框架。研究结果表明, 在4.20~4.00ka泾河流域发生了第一期多次古洪水事件, 在3.20~2.80ka发生了第二期特大古洪水事件。这些古洪水事件与全球性气候突变事件同时发生, 是泾河流域气候水文系统对于全球变化的响应。

关键词: 全新世, 古洪水, 气候事件, 光释光测年, 泾河

Abstract: On the basis of field investigations along the Jinghe River valley, a typical Holocene loess-soil profile with interbedded palaeoflood slackwater deposits was found at the Neolithic Yangshao Culture site near Yangguanzhai village, Gaoling county.OSL ages for the quarts grains at a size of 40-63μm were measured by using the single aliquot regenerative- dose(SAR)protocol.The optical ages of these samples ranged from 2.27±0.06ka BP to 14.26±0.58ka BP, showing agood relation with the depth in the YGZ profile.According to the age-depth function, the archaeological ages, grain-size distribution and the magnetic susceptibility in the YGZ profile, a Holocene chronological framework is established. The first episode of palaeoflood events is therefore dated to 4.20-4.00ka BP, and the second episode is dated to 3.20-2.80ka BP on the Jinghe River.These extraordinary floods occurred during the global abrupt climatic events.They represent a regional response of river system to global change.

Key words: Holocene, palaeoflood, climatic event, OSL dating, Jinghe River