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JYZ11A钻孔记录的居延泽演化历史

DOI: 10.11928/j.issn.1001-7410.2015.01.17, PP. 180-191

Keywords: 居延泽,末次冰期,全新世,湖泊演化,粒度,OSL测年

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Abstract:

我国内陆干旱区在末次冰期(含深海氧同位素第3阶段)是否存在古大湖近年来持续存在争论。居延泽是黑河的尾闾湖之一,位于我国典型干旱区,是开展这项研究的理想区域。依据居延泽盆地最低处的JYZ11A钻孔(全孔长61.13m,本文侧重上部27m岩芯),使用石英光释光测年获得3个可靠释光年龄并据此建立年代框架。全孔10cm间距测量沉积物粒度,钻孔上部16.7m以2cm间距测量低频磁化率,本文侧重分析JYZ11A钻孔上部10m的指标记录。综合岩性地层、沉积物粒度分布特征和粒度、磁化率指标记录,并与前人已有研究进行对比,本研究发现末次冰期时居延泽盆地主要堆积棕色冲洪积物和风沙沉积物,早全新世为风沙沉积,中全新世出现浅灰色湖相沉积与风沙交替沉积,而稳定湖泊只在约3ka时才逐渐形成,可能存在多次湖面波动并留下古湖岸堤。因此,居延泽盆地在末次冰期包括深海氧同位素第3阶段晚期并不存在稳定大湖。居延泽早全新世干涸、中晚全新世湖泊较稳定发育的全新世成湖模式与季风区湖泊演化模式明显不同,而与许多中亚干旱区的湖泊、风成沉积等古环境记录相似,它们可能共同指示了一种有别于中国季风区的全新世区域湿度演化模式。

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