湖泊沉积物Rb/Sr比值在古气候/古环境研究中的应用与展望
Advance and Porspective of Rb/Sr Ratios in Lake Sediments as an Index of Paleoclimate/Paleoenvironment
查看参考文献26篇
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文摘
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Rb和Sr在赋存矿物和表生地球化学行为等方面存在显著差异,因而各种记录体中的Rb/ Sr比值被广泛应用于古气候/古环境研究。湖泊沉积物中的Rb、Sr主要包括2部分来源:一是流域物理侵蚀直接带来的陆源碎屑组分,在沉积物中多以残渣态(碎屑矿物)形式存在;二是流域化学风化带来的溶解态物质,在湖泊水体中通过物理吸附、化学沉淀和生物吸收等过程沉降至湖泊沉积物中,多以非残渣态形式存在(包括可交换态、碳酸盐结合态、铁锰氧化物结合态和弱有机结合态等)。沉积物中不同赋存形态的Rb、Sr记录了不同的环境过程与信息,笼统地利用沉积物全样的 Rb/Sr比值来反演古气候/古环境往往存在偏差,尤其是在物理风化和化学风化呈反向变化的地区,采用沉积物全样Rb/Sr比值反演的古环境信息可能是混淆的,甚至是错误的。开展湖泊沉积物不同赋存形态Rb/Sr比值的研究可有效解决上述问题,并可提供更加全面、准确的流域物理搬运与化学风化信息:非残渣态Rb/Sr比值反映流域化学风化作用,适用于相对低分辨率(10年际)的研究;而残渣态Rb/Sr比值反映了流域物理搬运作用,可用于年际甚至更高分辨率的研究 |
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其他语种文摘
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Rb and Sr tend to disperse in different minerals,and they are significantly different in geochemical behavior under the Earth surface conditions,which makes Rb/Sr ratios of natural records used as a proxy of paleoclimate change.Under natural conditions,lake sediments include two material sources.One is the terrigenous debris directly caused by physical erosion,existing in the sediments mainly as the residual(detrital minerals)form.The other is dissolved substance caused by chemical weathering in the catchment,depositing in lake sediments through physical adsorption,chemical precipitation and biological uptaking,existing in the sediments as the non-residual(exchangeable,carbonate,Fe-Mn oxide and organic fraction)form.Rb and Sr of various forms record different environmental processes and information.It would exert effect on the accuracy of the research result to use Rb/Sr ratios of bulk sediment samples to reflect paleoclimate/paleoenvironment change.Especially in the catchment,where the changes of physical weathering and chemical weathering are inverse,it would cause confusion or even misreading of the result to use Rb/Sr ratios of bulk sediment samples to reflect paleoclimate/paleoenvironment change.However,it can effectively solve these problems and provide comprehensive information on the physical removal and chemical weathering in the catchment to carry out the study of Rb/Sr ratios of different forms of lake sediments:Non-residual Rb/Sr ratios reflect the chemical weathering in the basin,for relatively coarse resolution(10a international)research;and residual Rb/Sr ratios reflect watershed physical removal,for annual or even higher resolution. |
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来源
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地球科学进展
,2011,26(8):805-810 【核心库】
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关键词
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湖泊沉积物
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Rb/Sr比值
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古气候/古环境
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化学风化
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物理风化
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地址
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中国科学院地球化学研究所, 中国科学院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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文献类型
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综述型 |
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ISSN
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1001-8166 |
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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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国家科技支撑计划项目
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文献收藏号
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CSCD:4307573
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