北京万庄金矿床流体包裹体研究  

FLUID INCLUSION OF WANZHUANG GOLD DEPOSIT,BEIJING

作　　者：续颜[1] 孙丰月[2] 蒋菡[3] 

机构地区：[1]吉林大学博物馆,吉林长春130026 [2]吉林大学地球科学学院,吉林长春130061 [3]吉林大学学报编辑部,吉林长春130026

出　　处：《地质科技情报》2004年第3期47-51,共5页Geological Science and Technology Information

基　　金：吉林大学创新基金资助项目

摘　　要：对北京万庄金矿床流体包裹体的研究发现,同一石英样品中原生流体包裹体的均一温度存在三个明显不同的温度区间,即90.8～169.7,276.8～298.8,335.2～376.4°C,各温度区间对应流体的平均盐度w(NaCl)分别为4.39%,7.13%,12.83%,流体包裹体温度和盐度的特点反映在石英生长过程中捕获了不同来源的流体;稳定同位素的研究结果表明,前、后两种流体分别代表了大气降水和岩浆水的特点,中间为两者的混合体,说明万庄金矿床在成矿过程中有大气水和岩浆水两种流体的参与;利用流体包裹体特征,计算出成矿压力,由压力值估算成矿深度为2.00～2.42km,从而确定该矿床属造山型金矿床中的浅成金矿床。The study on the fluid inclusions within quartz of Wanzhuang gold deposit in Beijing shows that there are three distinctive groups of primary fluid inclusions in one quartz sample. They have different homogenizating temperatures,90.8-169.7,276.8-298.8,335.2-376.4°C, corresponding to different average fluid salinities of 4.39%, 7.13% and 12.83% w(NaCl), respectively. It is suggested that quartz captured different sources of water during its crystallization. Combined with stable isotope data, the authors have concluded that the low temperature, low salinity fluid inclusions represent meteoric water and the inclusions with high temperature and salinity are derived from magmatic water while the fluid inclusions with transitional parameters are the mixture of the former two sources of water. Therefore, meteoric and magmatic water was involved in the gold mineralization in Wanzhuang gold deposit. Meanwhile, pressure data are also obtained from fluid inclusion study. Based on pressure and the relationship between pressure and depth in fracture zones, mineralizing depth of 2.00-2.42 km has been gotten, which helps to suggest that Wanzhuang gold deposit should belong to the epizonal one in orogenic type gold deposits should proposed by Groves et al.in 1998.

关 键 词：万庄金矿床 流体包裹体 成矿流体 成矿深度 造山型金矿床 

分 类 号：P618.51[天文地球—矿床学]