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地球学报  2006 

甘肃代家庄铅锌矿的地质特征与找矿意义

DOI: 10.3975/cagsb.2006.06.11

Keywords: 甘肃,铅锌矿床,密西西比河谷型,硫同位素地球化学

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Abstract:

位于甘肃宕昌县的代家庄矿床曾被认为是西成矿田铅锌找矿的重大进展,矿床产于秦岭西成盆地西北端泥盆系浅海相的富含生物化石的细碎屑岩—灰岩中。矿体不规则受NW向断裂的控制,呈角砾状分布于下部碎屑岩与上部厚层灰岩界面附近灰岩一侧。矿石的矿物共生组合为闪锌矿方铅矿少量黄铁矿少量白铁矿方解石,不含石英。硫化物发育大量的胶状、球粒状、草霉状微晶结构,部分显现出微生物化石结构特点。对代家庄与西成主要类型铅锌矿床地质地球化学特征的对比发现,二者在容矿围岩沉积环境、矿石形态、结构构造以及同位素地球化学等多方面存在明显的差异,代家庄矿床成因属于碳酸盐岩容矿的低温热液矿床,不同于西成矿田的主要SEDEX类型。主要控矿因素为灰岩—碎屑界面附近、NW向断裂等。

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