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水-岩反应过程中的锂硼同位素分馏变化规律
Lithium-boron isotopic fractionation variation in the water-rock interaction process
投稿时间:2017-01-06  修订日期:2017-11-24
中文关键词:水-岩反应  硼同位素  锂同位素  地球化学示踪工具
英文关键词:water-rock interaction  boron isotope  lithium isotope  geochemical tracer
基金项目:国家自然科学基金面上基金(41573038)
作者单位E-mail
翁梅茂 中国地质科学院 矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室, 北京 100037  
杨丹 中国地质科学院 矿产资源研究所, 国土资源部成矿作用与资源评价重点实验室, 北京 100037 yangd-2013@163.com 
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中文摘要:
      作为热液体系中成矿的一个重要前提,水-岩反应一直以来都是矿床学的重要研究内容,亦是国际地学界的前沿问题。该过程伴随着同位素的交换,使流体和岩石的同位素组成发生变化。硼和锂同位素作为非传统的稳定同位素示踪工具,常用于限定流体和岩石的热液反应过程。本文对水-岩反应过程中影响硼和锂同位素分馏的因素作了较全面概述,包括温度、pH值、溶解过程、表面交换反应以及次生矿物的沉淀过程,并取得了一些主要认识:①一般地,低温或者高pH值时流体更快速富集11B并且在反应结束时有更高的δ11B值;低温(<150℃)时锂进入次生矿物中,高温(>200℃)时锂从岩石中萃取出来。②初始物质的溶解过程与表面交换反应对锂同位的分馏几乎没有影响。③一般而言,次生矿物的形成使7Li优先丢失进入溶液而富集重同位素。最后简单陈述了水-岩反应过程中硼和锂同位素组成的质量平衡模拟计算以及反映流体和岩石的同位素组成的变化。
英文摘要:
      As an essential precondition of ore-forming process in the hydrothermal system, water-rock interaction is not only an important subject of metallogeny but also an international geological trend. This process is along with isotopic exchange, which changes the isotopic compositions of fluid and rock. As tracers of non-traditional stable isotopes, boron and lithium isotopes are often used to constrain fluid-basalt hydrothermal interaction process. This paper gives a detailed review of factors of boron and lithium isotopic fractionation variation, which include temperature, pH values, primary phase dissolution, surface exchange and secondary mineral formation. Some conclusions have been reached:① Generally, the fluids in equilibrium become more quickly enriched in 11B and end with higher δ11B; At low temperatures (<150℃) Li is taken into secondary minerals and at high temperatures (>200℃) it is leached from the rocks. ② Primary phase dissolution and surface exchange hardly have influence upon lithium isotope fractionation. ③ Usually, the heavier isotope 7Li preferentially goes into solution and finally the solution tends to be with higher δ7Li. Simulation of mass balance equilibrium of the evolution of isotopic compositions in the fluid and the bulk rock with the reaction progress was also made in this paper.
翁梅茂,杨丹,2018,水-岩反应过程中的锂硼同位素分馏变化规律[J].岩石矿物学杂志,(1):128~142.
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