含金剪切带的类型划分及成矿机理

CLASSIFICATION OF AURIFEROUS SHEAR ZONES AND THEIR METALLOGENIC MECHANISM

含金剪切带型金矿床是一种重要的新型矿床类型。本文系统地总结了含金剪切带的特征,提出了含金剪切带的几何学和运动学分类方案,并以成矿源,成矿场、成矿期和成矿相等方面论述了含金剪切带型金矿床的剪切动力成矿机制,建立了过渡型和叠加型两类动力成矿模式。

Auriferous shear zones, consisting of ductile shear zones and brittle-ductile shear zones that formed and controlled gold deposits, show conspicuous structural, evolutionary and mineralization characteristics. The ductile shear zone and brittle-ductile shear zone as well as their R. R'. P. D. T. fissures make up a multigrade structural system, commonly being products of multiphase tectonic activity. According to their geometry and kinematics, the auriferous shear zones might be divided into harmonic type and inharmonic type as well as normal fault style, thrust fault style and strike-slip style, their associations being mainly parallel, network and conjugated forms. Shear zones not only serve as the ore-controlling structure, but also play an important role in metallogenesis. The metallogenic source, field, epoch and facies constitute the important dynamic metallogenic mechanism of the auriferous shear zone type gold deposits. A dynamic metallogenic model for this type of deposits has been established on the basis of mineralization zoning and the relationship between metallogenesis and structural setting.