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矿床地质  2003 

湖南东坡矿田金船塘锡铋矿床铅同位素地球化学及成矿年龄

Keywords: 地球化学,Pb-Pb等时线年龄,分步酸淋滤,硫化物,金船塘锡铋矿床

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Abstract:

文章选取金船塘锡铋矿床中的辉铋矿-黄铁矿矿石及长石样品进行了铅同位素分析,并对其中两个放射成因铅含量较高的黄铁矿进行了单矿物分步酸淋滤铅同位素分析。结果表明矿床的Pb-Pb等时线成矿年龄为(164±12)Ma,该年龄与千里山岩体燕山早期第一期的岩浆侵入年龄在误差范围内相同,说明矿化的发生与该期花岗岩的侵入关系非常密切。金船塘矿床铅同位素的构造演化模式研究表明铅来源于上地壳,说明千里山花岗岩体是由于上地壳发生部分熔融而形成的S型花岗岩。

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