铁同位素体系及其在矿床学中的应用

被引：34

作者：

王跃

朱祥坤

机构：

[1] 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,大陆构造与动力学国家重点实验室

来源：

岩石学报 | 2012年 / 28卷 / 11期

关键词：

含铁矿物; 铁同位素; 流体出溶; 流体演化; 成矿物质来源;

D O I：

暂无

中图分类号：

P597.2 [];

学科分类号：

070902 ;

摘要：

本文报道了世界范围内不同含铁矿物的Fe同位素组成,进一步了解了铁同位素在不同含铁矿物中的基本分布特征;系统总结了铁同位素在不同储库和不同类型矿床中的分布特征,构筑了铁同位素体系的基本框架;结合最新的研究成果,较全面地总结了铁同位素在矿床学领域的应用,得出了铁同位素可以用来示踪流体出溶、流体演化、表生蚀变作用和成矿物质来源的基本认识。在流体出溶过程中,相对于岩体,出溶的流体富集铁的轻同位素;成矿流体体系的演化过程中,矿物的结晶沉淀会导致铁同位素发生分馏,随着Fe(Ⅲ)矿物的结晶沉淀,流体逐渐富集铁的轻同位素,随着Fe(Ⅱ)矿物的结晶沉淀,流体逐渐富集铁的重同位素,随着矿物的结晶沉淀,流体的Fe同位素组成随时间发生演化;在成矿后的表生蚀变作用过程,高温蚀变作用形成的产物相对于原矿物富集铁重同位素,低温蚀变作用形成的产物基本保留了原矿物的铁同位素组成;Fe同位素在示踪成矿物质来源具有应用潜力,流体出溶、流体演化等重要成矿作用过程中Fe同位素组成的变化规律是利用Fe同位素示踪Fe来源的关键所在。

引用

页码：3638 / 3654

页数：17

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