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地理科学  2012 

江汉平原12.76cal.kaB.P.以来环境干湿变化的高分辨率研究

, PP. 878-884

Keywords: 江汉平原,Ti元素含量,Rb/Sr,磁化率,干湿变化

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Abstract:

选择位于江汉平原的JZ-2010湖相沉积剖面为研究对象,利用AMS14C测年建立江汉平原12.76cal.kaB.P.以来环境演变的时间序列。对湖相沉积物中元素Rb和Sr的差异分布、Rb/Sr值、Ti元素含量以及磁化率等多项环境代用指标的综合分析表明江汉平原12.76cal.kaB.P.以来环境干湿变化经历了晚冰期由偏干转向偏湿波动、全新世开始湿度增强、全新世中期偏湿到湿润再至干湿波动,全新世晚期至现代偏湿到偏干的过程。磁化率波动与江汉平原新石器时代各文化类型出现或转型相关。江汉平原环境干湿变化体现东亚季风环流影响,驱动机制主要是北半球夏季太阳辐射变化;还受到东北、北、西三面环山而东南面向夏季风倾斜开放的地势影响。

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