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矿床地质  2001 

川西农都柯火山岩型低温热液Au-Ag多金属矿床的特征与成因

Keywords: 义敦岛弧,火山岩,低温热液,Au-Ag多金属矿床

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Abstract:

农都柯矿床是在义敦岛弧带中旨次发现的火山岩型浅成低温Au-Ag多金属矿床。该矿床产丁弧后扩张盆地的勉戈组流纹岩巾,受韧性剪切带控制。矿床中发育一套典型的低温热液矿物组合,包括辉锑铅矿、辉锑银铅矿、辉锑矿、砷黝铜矿、自然金、黄铁矿、闪锌矿、雌黄、雄黄、登红石(HgO)等。蚀变作用以硅化和绢云母化为主,伴生重品石化和蒙脱石化。按照现行的火山岩型低温热液金-银矿床的分类原则,该矿床应属丁-高硫的酸性硫酸盐型。流体包裹体研究表明,主要成矿过程发生在221~130℃之间:成矿流体的温度与盐度演化趋势暗示着矿床之下存在一隐伏岩浆房。硫、铅同位素显示成矿物质主要来自弧后火山岩,矿床是岩浆热液与大气降水对含矿火山岩(矿源层)联合作用的结果。

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