地球科学进展 ›› 2017, Vol. 32 ›› Issue (8): 800 -809. doi: 10.11867/j.issn.1001-8166.2017.08.0800

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镁同位素体系在河流中的研究进展
董爱国( ), 韩贵琳 *( )   
  1. 中国地质大学(北京)科学研究院,北京 100083
  • 收稿日期:2017-03-23 修回日期:2017-05-31 出版日期:2017-10-20
  • 通讯作者: 韩贵琳 E-mail:aiguo.dong@cugb.edu.cn;hanguilin@cugb.edu.cn
  • 基金资助:
    国家自然科学基金项目“环境地质”(编号:41325010);国家自然科学基金国际合作项目“泰国Mun河流域物质循环的生物地球化学过程及水环境效应”(编号:41661144029)资助

A Review of Magnesium Isotope System in Rivers

Aiguo Dong( ), Guilin Han *( )   

  1. School of Scientific Research, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2017-03-23 Revised:2017-05-31 Online:2017-10-20 Published:2017-08-20
  • Contact: Guilin Han E-mail:aiguo.dong@cugb.edu.cn;hanguilin@cugb.edu.cn
  • About author:

    First author:Dong Aiguo(1982-), male, Xilinhaote City,Nei Monggol Autonomous Region, Lecturer. Research areas include stable isotope geochemistry.E-mail:aiguo.dong@cugb.edu.cn

  • Supported by:
    Project supported by the National Natural Science Foundation of China “Environmental geology” (No.41325010) and “Biogeochemical processes of the material cycle and the effect of the water environment in Mun River, Thailand” (No.41661144029)

近年来风化过程中镁同位素的研究取得了一系列重要进展,这些进展不仅有利于准确理解河流中镁同位素组成变化的机理,还为深入探讨镁同位素地球化学循环奠定了基础。河流既是风化过程中镁的汇,也是海洋中镁的源。流域河水的镁同位素组成主要与物源和迁移过程中镁同位素分馏有关。河水的镁主要来源于流域的岩石,也受风尘沉积、地下水、植物残骸、降雨降雪等因素的影响。河水迁移过程中镁同位素分馏过程主要为碳酸盐矿物沉淀和溶解、硅酸盐矿物水解、矿物或胶体物质的吸附作用以及植物的吸收作用。此外,水体中次生矿物的形成还可能反映了河流水化学参数(主量元素、CO2溶解度、pH等)的突变。因此,分析河水的镁同位素组成,探讨其主要的分馏过程,不仅是应用镁同位素示踪地表物质循环的基础,还对深入认识镁同位素的地球化学循环具有重要意义。

In recent years, a series of important progresses have been made in the aspect of magnesium isotopes behavior in weathering processes. These progresses are not only favorable to understand the change of the magnesium isotopic compositions in rivers, but also establish the foundation to further reveal the magnesium isotope geochemical cycle. The magnesium in rivers is both magnesium sink for weathering and magnesium source for the ocean. The Mg isotopic compositions in rivers are dominated by the magnesium sources and Mg isotope fractionations processes. The sources of magnesium in rivers originate mainly from draining rocks, as well as less contribution from the eolian deposition, groundwater, plant debris, and precipitation. The Mg isotope fractionations in rivers are mainly related to precipitation and dissolution of carbonate minerals, silicate mineral hydrolysis, adsorption on mineral or colloidal matter surface, and plant uptake. Generally, the contribution of carbonate minerals dissolution or precipitation is equal to add or reduce magnesium from carbonate endmember, which has a remarkably negative δ26Mg value. Based on the fact that most clay minerals are rich in 26Mg during nature silicate mineral hydrolysis, then it is possible to infer that residual weathering products enrich in 26Mg. However, there is no significant Mg isotope fractionation causing by the adsorption on mineral or colloidal matter surface during river water migration. For the plant uptake, the root prefers to have 26Mg, leading the plant itself rich in heavier Mg isotopic composition. In addition, formation of secondary minerals in rivers could also reflect the changes of chemical parameters in rivers (such as major elements, CO2 solubility, pH, etc.). Hence, Mg isotopic composition in rivers and associated isotope fractionations are not only the basis for the application of magnesium isotope to trace surface material cycle, but also have important significance for the further understanding the geochemical cycle of magnesium isotopes.

中图分类号: 

图1 部分河流及其相关储库的镁同位素组成
(a)~(e)数据来源于参考文献[2];(f)数据来源于参考文献[23,30];(g)数据来源文献[31~34];(h)数据来源于参考文献[4,6,33~37];(i)来源于参考文献[31~35,38];(j)~(t)数据来源于参考文献[6~10,31,34,39~42]
Fig.1 Magnesium isotopic compositions of some rivers and their associated reservoirs
Data source (a)~(e)from reference[2];(f)from references[23,30];(g)from references[31~34];(h)from references[4,6,33~37]; (i)from references[31~35,38];(j)~(t)from references[6~10,31,34,39~42]
图2 河水镁同位素组成的主要影响因素
Fig.2 The controlling factors for the Mg isotopic composition of river water
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