DISCUSSION ON THE IMPORTANCE OF DUCTILE SHEAR DEFORMATION IN GOLD MINERALIZING PROCESS
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摘要: 剪切带型金矿是一种重要的金矿类型.韧性-超韧性深层次剪切变形是促使Au元素活化分异、形成动力变质含金热液的过程,中浅层次的韧脆性、脆性剪切变形区是Au元素聚集成矿部位.韧脆性剪切带的不同变形层次及其构造岩类型决定了剪切带型金矿床的矿化类型.剪切带型金矿床往往具有成矿时代滞后、空间规模差异、物源指示差异、韧性变形强度与Au元素含量反相关等异常特征.长期演化的造山带附近及边缘是寻找大型剪切带型金矿床的有利地区.
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关键词:
- 韧性剪切带 /
- 金矿床 /
- 成矿作用 /
- 演化 /
- 动力分异(变质)热液
Abstract: The ductile shear zone type of gold deposit is one of the most important gold deposit types Deep ductile shear deformation causes Au to reactivate and differentiate from the source rocks,forming Au-bearing tectono metamorphic hydrothermal solution Meso-epizonal ductile-brittle deformation domain is the favourable site for gold ore accumulation The type of gold metallization are controlled by shear deformation level and features of the deformed rocks The important characteristics of the ductile shear zone type of gold deposit are that metallogenesis occurs after the ductile shear deformational stage;gold ore-bodies are mainly developed in some smaller ductile shear zones;metallogenic elements are derived mainly from surounding or deep-seated rocks;and the content of Au is negatively correlated to the ductile deformation intensity of the mylonite The areas near the orogenic belts are the favourable places for finding shear zone type of gold deposits. -
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