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地球科学进展  2016, Vol. 31 Issue (1): 43-58    
综述与评述     
表生环境中镁同位素的地球化学循环
董爱国, 朱祥坤*
中国地质科学院地质研究所 国土资源部同位素地质重点实验室/大陆动力学国家重点实验室,北京 100037
Mg Isotope Geochemical Cycle in Supergene Environment
Dong Aiguo, Zhu Xiangkun
MLR Key Laboratory of Isotope Geology, State Key Laboratory of Continental Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
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摘要:

近些年表生环境中镁同位素分馏取得了一系列重要研究进展,这些新认识为深入理解表生环境中镁同位素地球化学循环奠定了基础.表生环境中镁同位素的地球化学循环主要涉及风化,河流搬运,碳酸盐沉淀,水岩反应等重要地质过程.风化过程中镁同位素发生显著分馏,硅酸盐风化产物中富集重的镁同位素,轻的镁同位素易进入水体.河流搬运过程中,镁同位素不发生分馏,但外源输入可能影响水体的镁同位素组成.河水汇入海洋后,碳酸盐沉淀过程可导致轻的镁同位素以碳酸盐的形式从海水中移出.在海底高温水岩反应过程中,海水中绝大多数的镁(80%~87%)都进入岩石,循环后的热液可能富集轻的镁同位素.海底低温水岩反应过程中海水的镁可以进入岩石并形成次生矿物,此过程的镁同位素分馏主要与次生矿物的形成有关.此外,海水中的镁易与黏土矿物发生交换反应,此过程黏土矿物倾向于吸附轻的镁同位素.总之,在表生环境中上地壳的镁(26Mg约为-0.22‰)经历风化作用,河流搬运,海洋贮存,最终以碳酸盐岩(26Mg一般小于-1‰)或与玄武岩发生反应的形式重新回到岩石圈.

关键词: 碳酸盐岩沉淀镁同位素水岩反应风化作用地球化学循环    
Abstract:

Mg isotope fractionation in the supergene environment have been obtained many important advances in recent years, and these new knowledge supply the clues for further understanding Mg isotope geochemical cycle in the supergene environment. Mg isotope geochemical cycle in the supergene environment involves some important geological processes, such as weathering, river transportation, carbonate sedimentation and water-rock reaction. Mg isotope fractionates dramatically in weathering process. Silicate weathering products enrich in 26Mg (secondary clay minerals prefer to combine with 26Mg) and 24Mg prefer to be into the aqueous phase. Although there is not significant Mg isotope fractionation during river transportation, Mg isotope of river water could still be affected by the supplement of external sources. Most magnesium from river water are transported into the ocean, and then the carbonate precipitation prefers to remove 24Mg from ocean as carbonate minerals. Submarine low temperature waterrock reaction could transport less magnesium from ocean into the rocks during secondary mineral formation, which is associated with Mg isotope fractionation. However, most of magnesium (80%~87%) in seawater prefer to combine with the rock in high temperature waterrock reaction and recirculated hydrothermal fluid may be enriched in 24Mg. In brief, magnesium from upper crust (δ26Mg about -0.22‰) experiences weathering and transports by river water to ocean in the supergene environment. The magnesium in ocean could recycle into the rocks by the process of carbonate precipitation (δ26Mg is less than -1‰) or reacting with submarine basalt to form secondary mineral.

Key words: Carbonate sedimentation    Weathering    Water-rock reaction    Geochemical cycle.    Mg isotope
收稿日期: 2015-08-30 出版日期: 2016-01-10
:  P595  
基金资助:

*国家自然科学基金项目"辽东裂谷带菱镁矿镁同位素特征及其对矿床成因的制约"(编号:41203004); 国土资源部行业专项基金项目"Fe,Mg同位素在辽东裂谷带菱镁矿及硼镁铁矿中的应用研究"(编号:201211074)资助

通讯作者: 朱祥坤(1961-),男,山东沂水人,研究员,主要从事同位素地球化学研究.E-mail:xiangkun@cags.ac.cn   
作者简介: 作者简介:董爱国(1982-),男,内蒙古锡林浩特人,博士后,主要从事金属同位素地球化学研究.E-mail:aiguo.dong@cags.ac.cn
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引用本文:

董爱国, 朱祥坤. 表生环境中镁同位素的地球化学循环[J]. 地球科学进展, 2016, 31(1): 43-58.

Dong Aiguo, Zhu Xiangkun. Mg Isotope Geochemical Cycle in Supergene Environment. Advances in Earth Science, 2016, 31(1): 43-58.

链接本文:

http://www.adearth.ac.cn/CN/        http://www.adearth.ac.cn/CN/Y2016/V31/I1/43

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