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矿床地质  2005 

柴北缘地区的两类块状硫化物矿床——Ⅱ.青龙滩式VHMS型Cu_S矿床

Keywords: 地质学,VHMS型Cu_S矿床,青龙滩式,柴北缘

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Abstract:

文章综述了柴北缘地区的VHMS型Cu_S矿床——青龙滩式矿床,指出其容矿岩石为加里东造山带中被改造过的岛弧火山岩,该矿床中含铜硫化物矿层形成后不但遭受过构造的强烈改造,而且也受后期矽卡岩化的改造和叠加。放射性同位素测年结果表明,青龙滩矿床的主岩——安山岩形成于晚寒武世(514.2±8.5)Ma,后期的矽卡岩矿化大约发生在290Ma。柴北缘加里东造山带中既产有VHMS型Cu_S矿床(如青龙滩矿床),也产有SEDEX型Pb_Zn矿床(如锡铁山矿床),两者的成矿地质构造背景和形成年龄不相同。柴北缘地区的早古生代洋(海)盆于晚寒武世俯冲消减,出现岛弧,并形成青龙滩等VHMS型Cu_S矿床,之后(早奥陶世),发生弧后拉张,形成弧后盆地及锡铁山等SEDEX型铅锌矿床。

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