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湘中龙山金-锑矿床氧同位素异常的发现与找矿意义
THE DISCOVERY OF OXYGEN ISOTOPIC ANOMALIES AND THEIR GEOLOGICAL SIGNIFICANCE FROM THE LONGSHAN Au-Sb DEPOSIT,CENTRAL HUNAN
【摘要】 系统分析了龙山金-锑矿床矿石、蚀变围岩与未蚀变围岩的氧同位素组成,其变化范围分别为13.1‰~13.5‰、14.5‰~15.3‰与19.2‰~20.0‰,显示矿石与蚀变围岩中存在明显的氧同位素负异常。氧同位素负异常可以作为该区寻找隐伏矿体的一种新的手段,其矿石与蚀变围岩氧同位素负异常的形成是大气降水与围岩水/岩反应的结果。
【Abstract】 In this work we systematically measured the oxygen isotopic compositions of ores,altered wall rocksand unaltered wall rocksfrom the Longshan Au-Sb deposit.The results showed that the oxygen isotopic compositions of ores((13.1‰)～13.5‰) and altered wall-rocks(14.5‰～15.3‰) are much lower than those of unaltered wall-rocks(19.2‰～(20.0‰)).Negative oxygen isotopic anomalies of ores and altered wall-rocks might be caused by water-rock reaction,and negative oxygen isotopic anomalies could be used as a new approach tolooking for deep-sited orebodies in this area.
【Key words】 Au-Sb deposit； oxygenisotopic composition； negative anomaly； geologicalsignificance； Longshan；
- 【文献出处】 矿物学报 ,Acta Mineralogica Sinica , 编辑部邮箱 ,2005年03期
- 【分类号】P618.2;P597;
- 【被引频次】2
- 【下载频次】176