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矿床地质  2006 

云南澜沧江南段火山岩演化及其铜多金属矿床的成矿特点

Keywords: 地质学,火山岩,岛弧,铜多金属,成矿作用,澜沧江

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Abstract:

澜沧江南段火山岩十分发育,它们基本沿澜沧江河谷两岸分布。火山岩带形成于漫长的地质历史时期,主要有元古代、石炭纪、二叠纪和三叠纪火山岩。它们的主体形成于洋壳向大陆俯冲消减而产生的岛弧环境中。伴随火山岩浆喷溢,也从深部带来了大量有用元素,在火山岩中形成了众多矿床(点),其中以大平掌、三达山、民乐、文玉—官房等4类铜多金属矿床最有代表性,它们分别形成于不同构造环境的火山活动中,从早到晚,总体是从岛弧中心向大陆边缘,甚至向板内裂谷转移。环境不同,因而成矿作用各有其特点,这在西南三江构造_岩浆带中是十分少见的,对该带的深入研究有助于扩大区域找矿远景。

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