湖光岩玛珥湖非残渣态Rb/Sr比值研究及其古气候意义

被引:5
作者
曾艳 [1 ,2 ]
陈敬安 [1 ]
张维 [3 ]
朱正杰 [1 ,4 ]
李键 [1 ]
机构
[1] 中国科学院地球化学研究所环境地球化学国家重点实验室
[2] 中国科学院研究生院
[3] 贵州省环境科学研究设计院
[4] 外生成矿与矿山环境重庆市重点实验室重庆地质矿产研究院
关键词
沉积物; Rb/Sr比值; 化学风化; 湖光岩玛珥湖;
D O I
10.19700/j.0379-1726.2011.03.004
中图分类号
P532 [古气候学];
学科分类号
070903 ;
摘要
湖泊沉积物Rb/Sr比值变化主要受控于Sr含量的变化,而真正反映流域化学风化强度的主要是迁移至集水盆地(湖泊)的溶解态Sr2+,在沉积物中主要以碳酸盐结合态和铁锰氧化物结合态等形式存在。通过对不同赋存状态的Rb/Sr比值与相应的Sr含量之间相关关系的对比分析发现,沉积物非残渣态Rb/Sr比值更好地反映了流域化学风化。根据湖光岩玛珥湖沉积物非残渣态Rb/Sr比值的剖面变化,恢复了该流域一千多年来的化学风化历史。湖光岩玛珥湖非残渣态的Rb/Sr比值在AD704~1850年存在2个低值,即AD740~860年和AD1400~1750年,表明这两个时段该流域化学风化较强,其中AD1550~1700化学风化最强。湖光岩玛珥湖流域的化学风化主要受降水的控制,而温度对它的影响不明显。
引用
收藏
页码:249 / 257
页数:9
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