川滇黔接壤区拉一木玄武岩铜矿流体包裹体

发布时间：2018-02-11 12:07

  本文关键词： 峨眉山玄武岩 地幔柱 自然铜 流体包裹体 拉一木　出处：《现代地质》2016年03期 　论文类型：期刊论文

【摘要】：扬子地台西南缘形成的大面积自然铜矿化是峨眉地幔柱成矿系统的重要组成部分。以四川省昭觉县拉一木玄武岩铜矿流体包裹体为研究对象,通过与自然铜矿共生的石英和方解石中各类型包裹体测定,将该自然铜矿成矿过程划分为两个阶段,其中早阶段成矿流体具有中-低温、高盐度的盆地热卤水与有机流体的混合作用特征,流体组成为H_2O,含少量甲烷、烃类及沥青,液态烃以荧光性强的芳烃为主,包裹体均一温度140~306℃,w(NaCl)值分布在3%~10%、11%~14%、21%~24%三个区间,平均盐度为8.6%;晚阶段流体表现为低温低盐度特征,均一温度80~190℃,w(NaCl)值0.2%~8%,平均值4.8%,表明流体是由地表下渗的大气降水经水岩反应后转变而成。研究区自然铜矿流体包裹体与滇东北昭通地区玄武岩铜矿流体包裹体特征基本一致。无机物与有机物反应、地幔流体促成不同类型流体与其混合以及缺硫条件和有机质的还原作用是导致本区自然铜沉淀富集成矿的主要机制。
[Abstract]:A large area of natural copper mineralization in the southwestern margin of the Yangtze platform is an important part of the mantle plume metallogenic system in Emei. The fluid inclusions of the Tarim basalt copper deposit in Zhaojue County Sichuan Province are studied. Through the determination of the inclusions in quartz and calcite coexisting with the natural copper deposit, the metallogenic process of the natural copper deposit is divided into two stages, in which the ore-forming fluid in the early stage is of medium-low temperature. The mixing characteristics of hot brine and organic fluids in high salinity basin are characterized by the composition of H _ 2O, containing a small amount of methane, hydrocarbons and bitumen, the liquid hydrocarbon being mainly aromatics with strong fluorescence, the homogenization temperature of inclusions at 140 ~ 306 鈩，

本文编号：1503024