湖光岩玛珥湖非残渣态Rb/Sr比值研究及其古气候意义
The non-residual Rb/Sr ratio of the Huguangyan Maar Lake and its implications for paleoclimate change
查看参考文献49篇
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文摘
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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AD7041850年存在2个低值,即AD740860年和AD14001750年,表明这两个时段该流域化学风化较强,其中AD15501700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。 |
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其他语种文摘
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The Rb/Sr ratios in lake sediments depend on Sr contents.The chemical weathering of the drainage basin can be better reflected by dissolved Sr2+,which is mainly bound to carbonate and/or to Fe-Mn oxides in lake sediments.Through comparative analysis of Rb/Sr ratios in non-residual,residual and bulk samples,we found that the Rb/Sr ratios in non-residual samples were the closest to the chemical weathering in the catchment basin.The history of chemical weathering of the past 1000 years in the catchment of Huguangyan Maar Lake was reconstructed,on the basis of analyses of non-residual Rb/Sr ratio in the lake sediments.During AD740860 and AD14001750,the non-residual Rb/Sr ratios were much lower,indicating that the chemical weathering of the two periods were relatively strong.Our results showed that chemical weathering in the catchment was dominantly controlled by precipitation,while the effect of temperature was not obvious. |
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来源
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地球化学
,2011,40(3):249-257 【核心库】
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关键词
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沉积物
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Rb/Sr比值
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化学风化
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湖光岩玛珥湖
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地址
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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, 贵州, 贵阳, 550002
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贵州省环境科学研究设计院, 贵州, 贵阳, 550002
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中国科学院地球化学研究所, 外生成矿与矿山环境重庆市重点实验室;;环境地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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ISSN
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0379-1726 |
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学科
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地质学;环境科学基础理论 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:4236915
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