杨恺,李华

• 1:中煤地质工程总公司

摘要(Abstract)：

Forrestania绿岩带(FGB)位于西澳大利亚Yilgarn克拉通东南部,是澳大利亚重要的Ni-Cu-Au成矿带,属于澳大利亚一级Ni、Cu成矿远景区和三级Au成矿远景区。FGB地区的Ni-Cu矿床主要与带内的超镁铁质岩墙有关,属于富硫化物接触交代型成矿,主要以巨厚层状产出在基底长英质碎屑沉积岩和上覆的科马提岩之间。FGB地区金矿的形成主要与北北西向和北北东向构造内的石英脉有关,属于石英脉型金矿,是含镍硫化物富集(Ni)、多期后成矿构造运动、岩浆活动、变质作用和热液交代(Au)等多种地质活动长期复杂混合的产物。其形成过程主要分为以下几个阶段:早期Ni的沉积阶段、早期区域构造运动阶段、持续构造活动阶段、Ni矿体解体和Au元素富集阶段、Au矿脉的形成阶段。根据上述理论指导,笔者分析成矿特征后,选出Au成矿远景区,进行物化探综合勘查,圈定出异常区域,并在异常区内发现了较好的矿化线索。通过实践证明了理论推断的可信度。

关键词(KeyWords)： Forrestania绿岩带;Ni-Cu-Au成矿带;富硫化物接触交代型成矿

Abstract:

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基金项目(Foundation):

作者(Author): 杨恺,李华

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