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中国沙漠  2012 

阿拉善地区湖泊岩芯磁性特征记录的全新世环境变化

Keywords: 全新世,环境磁学,居延海,阿拉善

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Abstract:

对居延海G36钻孔进行了系统磁性特征分析,并结合总有机碳含量和粒度等环境代用指标,在精确测年的基础上,探讨了居延海地区全新世时期以来的环境变化。结果显示,居延海岩芯磁性矿物主要存在于粗颗粒的沉积物中,载磁矿物为颗粒较粗的多畴磁铁矿;磁化率变化机制比较复杂,与干湿环境变化没有简单正(反)关系。根据G36沉积物环境代用指标的变化,大致可以将其分为4个干湿交替时期:6700~4600aBP干旱时期,4600~3100aBP湿润时期,3100~2500aBP干旱时期以及1800aBP以来湖泊干涸。在这4个时期中,磁学参数记录了两次显著湿润事件和两次显著干旱事件。

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