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地球科学进展  2011, Vol. 26 Issue (8): 805-810    DOI: 10.11867/j.issn.1001-8166.2011.08.0805
综述与评述     
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
曾艳1,2,陈敬安1*,朱正杰1,李键1
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;2.中国科学院研究生院,北京100049
Advance and Porspective of Rb/Sr Ratios in Lake Sediments as an Index of Paleoclimate/Paleoenvironment
Zeng Yan1,2,Chen Jing′an1,Zhu Zhengjie1, Li Jian1
1.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China;
2. Graduate University of Chinese Academy of Sciences,Beijing 100049,China
 全文: PDF(922 KB)  
摘要:

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。

关键词: 湖泊沉积物Rb/Sr比值古气候/古环境化学风化物理风化    
Abstract:

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.

Key words: Lake sediments    Rb/Sr ratios    Paleoclimate/paleoenvironment    Chemical weathering    Physical weathering
收稿日期: 2010-08-25 出版日期: 2011-08-10
:  P595  
基金资助:

国家自然科学基金项目“湖泊沉积物不同赋存状态Rb/Sr比值与古环境研究”(编号:40873084);国家科技支撑计划项目“草海湿地生态系统恢复与重建关键技术研究与示范”(编号:2011BAC02B02)资助.

通讯作者: 陈敬安(1973-),男,湖北麻城人,研究员,主要从事环境地球化学研究.     E-mail: chenjingan@vip.skleg.cn
作者简介: 曾艳(1983-),女,陕西汉中人,博士研究生,主要从事湖泊沉积物元素地球化学研究. E-mail:zyan-2004@163.com
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引用本文:

曾艳,陈敬安,朱正杰,李键. 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[J]. 地球科学进展, 2011, 26(8): 805-810.

Zeng Yan,Chen Jing′an,Zhu Zhengjie, Li Jian. Advance and Porspective of Rb/Sr Ratios in Lake Sediments as an Index of Paleoclimate/Paleoenvironment. Advances in Earth Science, 2011, 26(8): 805-810.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2011.08.0805        http://www.adearth.ac.cn/CN/Y2011/V26/I8/805

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