安徽铜陵鸡冠石银(金)矿床地质地球化学特征  

GEOLOGY AND GEOCHEMISTRY OF THE JIGUANSHI SILVER (GOLD) DEPOSIT IN TONGLING, ANHUI

作　　者：储国正[1] 吴言昌 刘光华[2] 史东方[2] 郭祥焱[2] 周道玉[2] 胡富娥 

机构地区：[1]中国地质大学,北京100083 [2]安徽省地矿局,合肥230001

出　　处：《地质地球化学》2000年第3期31-39,共9页Geology-Geochemistry

摘　　要：鸡冠石银 (金 )矿床是铜陵地区一个具中型规模的银 (金 )矿床 ,在整个长江中、下游地区都有其代表性。矿床分四个主要成矿阶段 :夕卡岩阶段、氧化物 -硫化物阶段、石英 -硫化物阶段和石英多金属硫化物-碳酸盐阶段。对矿床的微量元素分析结果表明 ,独立的银、金矿物和含Au、Ag低的硫化物、含Ag硫盐矿物 ,主要形成于热液成矿期中晚阶段 ;矿床的轻、重稀土元素总浓度比值与辉石二长闪长岩相近 ,反映出二者的同源特征 ;稳定同位素和流体包裹体成分分析结果 ,反映出该矿床以岩浆热液为主的成因标志 ;成矿热液以岩浆水为主 ,但在成矿晚期有大气降水和地层成分加入 ;成矿流体为NaCl-KCl -H2 O体系 ;矿床成因属夕卡岩 -中低温热液充填The Jiguanshi deposit is a medium\|sized silver (gold) deposit recently discovered in the Tongling area, Anhui. Orebodies are complicated in mineral composition, with 51 metallic minerals already identified. The formation of the deposit might be divided into three metallogenic periods and four ore\|forming stages. This paper deals mainly with the trace element, hydrogen, oxygen, sulfur and carbon isotopic compositions of the Jiguanshi silver (gold) deposit. The results show that Ag and Au minerals were formed in the middle and late stages of the hydrothermal metallogenic period; the metallogenic material mainly came from pyroxene monzodiorite; magmatic water was dominant at the major stage of mineralization and meteoric water was dominant at the late stage. Metallogenic fluid is of the Na\|KCl\|H\-2O type. The Jiguanshi is a deposit of the skarn moderate-low temperature hydrothermal filling metasomatic type

关 键 词：微量元素 银矿床 稳定同位素 金矿床 地球化学 

分 类 号：P618.510.5[天文地球—矿床学] P618.520.5[天文地球—地质学]