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矿床地质  2005 

吉林红旗岭铜镍硫化物矿床的成矿时代讨论

Keywords: 地球化学,成矿年龄,印支期,铜镍硫化物矿床,红旗岭,吉林

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Abstract:

通过对红旗岭铜镍硫化物矿床1号含矿超镁铁质岩体和8号不含矿镁铁-超镁铁质岩体进行单矿物40Ar-39Ar法测年,得到与铜镍硫化物矿床相关的角闪石与黑云母结晶年龄分别为250Ma和225Ma,这一结果与前人所报道的K-Ar法年龄有明显的差异。结合与热液矿化相关的斜长伟晶岩锆石SHRIMP法年龄216Ma,认为镁铁-超镁铁质岩形成于250Ma左右的印支早期,铜镍硫化物矿床的形成时间晚于含矿岩体,大约为225Ma前后的印支中期。216Ma前后的岩浆期后热液叠加对成矿具有积极作用。

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