福建紫金山矿床流体运移-反应模式及其氧同位素示踪研究  

FLUID MIGRATION-REACTION MODEL OF ZIJINSHAN DEPOSIT AS TRACED BY VARIATION OF OXYGEN ISOTOPE COMPOSITIONS

作　　者：华仁民[1] 胡金化[1] 黄耀生[1] 李振敏 

机构地区：[1]南京大学内生金属矿床成矿机制研究国家重点实验室,南京210093

出　　处：《地球化学》1998年第2期187-195,共9页Geochimica

基　　金：国家自然科学基金!49372108

摘　　要：根据紫金山矿床不同位置和深度的蚀变岩石氧同位素组成变化特征，以及流体氢氧同位素和包裹体测温数据，讨论了成矿流体的来源及运移-反应机制。认为该矿床主要由大气降水的环流形成。大气降水下渗和上升排泄过程中，在不同的温度和W／R比条件下与围岩反应，发生氧同位素交换，从而造成了蚀变岩石氧同位素的空间变化。对岩石δ18O值的反演计算结果较好地证实了这-流体运移-反应成矿模式。Based on the variation of oxygen isotope compositions of altered rocks from different sites and depths in Zijinshan epithermal An-Cu deposit as well as data from hydrogen and oxygen isotope compositions of ore solution and fluid inclusion studies,the present paper discusses the source and migration-reaction mechanism of the ore-forming fluid. It is concluded that Zjinshan deposit formed mainly by the convective circulation of meteoric water. During the recharge and discharge processes of meteoric water, water-rock reaction and associated isotOPe exchange took place under different temperature and W / R conditions, resulting in the spaital variation of oxygen isotope compositions of altered rocks. An inversion calculation of δ13O values of altered rocks is conducted, which is in good accordance with measured values, also proving the fluid migration-reaction model of meteoric water in the ore formation.

关 键 词：氧同位素 铜矿床 流体运移 金矿床 反应模式 

分 类 号：P618.410.4[天文地球—矿床学] P618.510.4[天文地球—地质学]