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21kaB.P.以来大兴安岭中段月亮湖沉积物全岩有机碳同位素组成变化及其古气候意义

, PP. 1069-1077

Keywords: 月亮湖,全岩有机碳同位素,古气候,有效湿度

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Abstract:

月亮湖是位于大兴安岭中段阿尔山-柴河火山区的一个火山口湖,地处现今季风/非季风影响的过渡地带,对气候环境变化反应敏感。月亮湖长约9m的沉积岩芯记录了21cal.kaB.P.来的古气候演化历史。月亮湖沉积物全岩有机碳同位素组成(δ13Corg)、总有机碳含量(TOC)和总氮含量(TN)分析结果表明:δ13Corg值分布范围为-34.3‰~-24.8‰,具有9.5‰的变化幅度,但总体仍然在陆生C3植物的变化范围内。TOC含量分布范围为1.04%~23.55%,TN含量分布范围为0.08%~1.78%,TOC与TN含量变化趋势相同,呈正相关性,两者都显示出末次冰期晚期时含量特别低的特征。沉积物的TOC/TN比值(原子比)分布范围为6.3~28.2,其中末次冰期晚期的值比较低,说明沉积物中有机质以内源水生生物为主,其后TOC/TN比值明显升高且多>14,说明大部分有机质来源于汇水盆地中的陆生植物。根据多个指标综合分析,有效湿度的影响很可能是δ13Corg变化的主导因素。因此,近2万年来月亮湖全岩有机碳同位素组成变化与古气候变化的对应关系是:暖湿气候对应着偏负的δ13Corg值,冷干气候对应着偏正的δ13Corg值,全新世期间因植被变化不大,其δ13Corg值变化幅度也不大。

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