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地球学报  2010 

西藏班公湖-怒江成矿带及邻区铋矿化带的发现与意义

DOI: 10.3975/cagsb.2010.02.07

Keywords: 铋矿化,铋矿物,拉屋,舍索,班公湖-怒江成矿带

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Abstract:

铋是一种稀有金属,在世界分布很不均匀,全世界铋资源绝大部分赋存在中国,我国的铋资源主要集中在湖南的柿竹园。本文通过系统的野外调查与样品采集、室内ICP-MS与扫描电镜及电镜能谱方法分析,确定班公湖-怒江成矿带12个矿床(点)单件样品铋含量达到边界品位的要求,9个矿床(点)单件样品达到工业品位的要求,最高达到9575×10?6。铋含量高的地质体东西向呈带状展布,为一铋的成矿带。确定材玛矽卡岩型铁矿、尕尔穷矽卡岩型铜矿、舍索矽卡岩型铜铅锌多金属矿-社样多金属矿-更乃矽卡岩型铜铁矿、拉屋矽卡岩型铜矿-尤卡浪脉状铅矿共4个铋矿找矿远景区。铋矿物种类为硫铜铋矿、自然铋、硫铋铜铅矿、硫铋银矿共4种。铋含量较高的样品主要分布于矽卡岩型矿床中,斑岩型矿床的铋含量较低。班公湖-怒江成矿带铋的矿化时代应为燕山期,为班公湖-怒江向南(即冈底斯地块)俯冲使之闭合后碰撞阶段所形成的。拉屋多金属矿床正在开采,其矿石含有较高的铋含量,由于铋的单位价值远远大于正在开采的铜与铅锌等资源,因此,该矿床开采时需加强铋资源的评价,以提高其资源的综合利用价值。

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