黄陵背斜中南部月亮包金矿床流体成矿作用及矿床成因探讨  

Fluid inclusion mineralization and genesis of Yueliangbao gold deposit in the medium-south part of Huangling anticline

作　　者：曹锐[1] 李德威[1] 易顺华[1] 曹圣华[2] 李芳 

机构地区：[1]中国地质大学(武汉)地球科学学院 [2]江西省地质调查研究院 [3]湖北宜昌地质与矿产研究所

出　　处：《黄金》2009年第2期14-19,共6页Gold

基　　金：国家地质学理科基地创新人才培养基金项目(DXTZS0613)

摘　　要：黄陵背斜中南部的月亮包金矿床赋存于三斗坪岩体英云闪长岩(794 Ma)中,矿体主要受北北西向次级断裂构造控制,矿床形成经历了成矿前金初步富集、热液成矿作用、金次生富集3个成矿作用过程。流体包裹体岩相学、热力学及拉曼光谱研究表明:成矿热液总体属中-低温、中-低盐度且含有有机质的H2O-NaC l-CO2(CH4)体系类型。通过研究并综合分析前人资料初步认为:脆-韧性复合剪切带为其控矿构造;岩浆是成矿物质的主要来源;基性岩墙群侵位引起的加热升温作用配合挤压向伸展转换过程中压力突然释放,是引起成矿流体沸腾和成矿的重要因素;丰富的H2O、CO2、CH4等挥发组分是该区成矿的有利条件。As one of the typical gold deposits in the medium-south part of the Huangling anticline, the Yueliangbao gold deposit is located in Sandouping quartz-biotite diorite（794 Ma）, and the occurrence of ore bodies was controlled by secondary NNW striking faults. The forming of the deposit has experienced three main phase, i. e. （ 1 ） gold pre-enrichment, （2） the hydrothermal gold mineralization which resulted in the formation of primary ores, and （3） the re-enrichment of gold by supergene oxidation process. The researches on fluid inclusion petrography, thermodynamic and Raman spectra show that the ore-forming solutions are of H20-NaCI-CO2 （CH4 ） organic-matter type and featured by medium to low temperature, medium to low salinity condition. Finally, this paper draw out conclusions for Yueliangbao gold deposit： brittle-ductile shear belts are the structure which controlls the ore deposit. Enough crystallization, the heating and the decrease of pressure caused by the shallow intrusion are the key points for mineralization ; abundant volatile components including H2O, CO2 and CH4 are favorable conditions for mineralization in the region.

关 键 词：流体包裹体 作用成矿 矿床成因 黄陵背斜 月亮包金矿床 

分 类 号：P618.51[天文地球—矿床学]