辽宁朝阳东五家子金矿床成因类型讨论  

Discussion on genetic type of Dongwujiazi gold deposit of Chaoyang,Liaoning

作　　者：张博文[1] 孙丰月[1] 常国林 陈静[1] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]万华企业集团,辽宁朝阳122642

出　　处：《世界地质》2009年第3期297-304,333,共9页World Geology

基　　金：国家自然科学基金项目(40472050)

摘　　要：东五家子金矿矿脉围岩主要是太古宙建平群变质中基性火山岩。矿脉、围岩、脉岩及区域岩浆岩都具有负Eu异常（8Eu为0．2～0．4），LREE／HREE为3．4～11．6，（La／Yb）N为6．2～40．7，轻重稀土分馏程度较高，配分曲线有右倾趋势，说明在物质来源方面可能有一定的联系。矿石中黄铁矿和方铅矿60。S的变化范围为1．91×10^-3～3．14×10^-3，具有幔源硫的特征。氢、氧同位素组成的投影点介于岩浆水和大气降水之间，成矿流体以岩浆水为主，后期混入大气降水，成矿温度为144．6℃～183℃，成矿压力为（41．8～46．0）×10^6Pa，矿化深度为5．12～5．39km，属造山型金矿中的中浅成金矿床。The surrounding rocks of Dongwujiazi gold ore vein are mainly metamorphic intermediate-basic volcanic rocks in Jianping Group of Archean. Veins, wall rocks, dike rocks and regional magmatic rocks all exhibit negative Eu anomaly （δ Eu is 0. 2 -0. 4）, LREE/HREE is 3.4 - 11.6, （La/Yb）N is 6.2 -40. 7. The differential degree of light-heavy REE is high, and the distribution pattern is right incline, which indicate an inheritance relationship in material sources. The δ34S in pyrite and galena range from 1.91 × 10^-3 to 3.14× 10^-3, showing the mantle sulfur feature. Projection points of δD and δ18O locate between magmatie water and meteoric water, presenting the characteristic of magmatic water plays a dominant role, and meteoric water mixed in later stage. Forming temperature is 144. 6℃ - 183℃, mineralizing pressure is 41.8 ×10^6-46.0 × 10^6 Pa, and mineralizing depth is 5. 12 -5.39 km, it is recognized that the deposit belongs to middle-hypabyssal deposit of orogenic gold deposit.

关 键 词：东五家子金矿床 流体包裹体 稀土元素 稳定同位素 造山型金矿 

分 类 号：P618.5[天文地球—矿床学]