锂同位素与大陆风化
Lithium isotopes and continental weathering
查看参考文献103篇
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文摘
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气候变化与大气二氧化碳浓度息息相关。大陆岩石圈风化是影响大气二氧化碳浓度的重要过程。通过还原陆壳古风化信息,我们可以有效地了解地球气候条件的演化历史。传统方法上,前人曾使用锶同位素示踪大陆风化,但其解释尚有不足。例如,海水锶同位素比值会受到海洋热液的影响,而河流锶同位素比值则易受风化岩石类型的影响。此外,只有硅酸盐风化被认为在长时间尺度控制着大气碳汇,但锶的碳酸盐风化却与硅酸盐风化很难分辨。因此,我们需要一种更理想的同位素体系作为示踪大陆风化历史的介质。锂,作为微量元素,主要集中在岩石圈的硅酸盐矿物中,在碳酸盐岩含量较少。所以,硅酸盐风化可以使用锂同位素予以记录。同时,锂同位素受生物分馏效应影响较小,可以在海相碳酸盐岩中保存良好。这些优势为海相碳酸盐岩的锂同位素信号示踪大陆风化历史提供了有力支撑,但我们仍需对风化、迁移和结晶等过程的锂同位素地球化学行为有清晰的认识。为此,本文回顾不同储库的锂同位素组成以及各物相间锂元素配分和同位素分馏特征,总结了近年来锂同位素在重建大陆风化历史方面的进展,并详述了有待解决的关键问题。 |
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其他语种文摘
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Climate change is strongly affected by the concentration of CO_2 in the atmosphere.Weathering of continental lithosphere is an important process controlling the variation of atmospheric CO_2 concentration.By rebuilding the information of paleo-continental weathering profile,we can effectively understand the evolution history of Earth's climate.Traditionally,strontium(Sr)isotopes were used to trace the continental weathering,but there are still some deficiencies in the interpretation of Sr isotope records.For example,the Sr isotope ratios of seawater can be affected by hydrothermal fluids,while the Sr isotope ratios of waters in rivers can be easily affected by different types of weathered rocks.In addition,only the weathering of silicates is considered to control the atmospheric CO_2 sink over the geological time scale,but it is difficult to distinguish Sr isotope records of the carbonate weathering from those of the silicate weathering.Therefore,another suitable tracer of isotope system is required to reconstruct the history of continental weathering.Lithium(Li),a trace element,is mainly concentrated in the silicate minerals of the lithosphere,but very limited in carbonates.Thus,Li isotope system can be a promising tracer for the silicate weathering.Meanwhile,Li isotope ratios are less affected by vital biofractionation effects,and can be recorded well in marine carbonates.These advantages of Li isotope ratios in marine carbonates have provided strong support for tracing the continental weathering history.More importantly,it is necessary to clearly understand the geochemical behaviors of lithium isotopes related to the weathering,transport,and crystallization processes.Therefore,in this paper,we have introduced the Li isotope compositions of different reservoirs,and Li partitioning and isotope fractionation behaviors between various substances and phases,reviewed the recent progresses of lithium isotopes applied for tracing and reconstructing the continental weathering history,and given details of the key problems to be solved in the future. |
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来源
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矿物学报
,2021,41(2):127-138 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2021.41.054
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关键词
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锂同位素
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大陆风化
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同位素分馏
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地址
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1.
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550081
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中国科学院大学, 北京, 100049
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贵州民族大学, 贵州, 贵阳, 550025
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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文献收藏号
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CSCD:6933839
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