广东河台金矿构造特征及剪切带型金矿模式探讨

广东河台金矿的区域、矿田和矿床构造都是属于不同规模、级次及不同变形域类型的韧性剪切带,特别是控制矿床和矿体的是发育良好的深层韧性剪切带。河台金矿是典型的剪切带型金矿,所谓“剪切带型金矿”是受多级韧性剪切带构造控制,并以剪切作用为主要成矿机制的金矿床,可划分为剪切带糜棱岩型和剪切带脉型金矿,这两类是剪切带递进变形的产物。

ON THE STRUCTURAL CHARACTERISTICS OF HETAI GOLD-DEPOSIT GUANGDONG AND THE GOLD-DEPOSIT MODEL OF SHEAR ZONE TYPE

In Hetai gold-deposit, the regional tectonics, the ore-field structures, andthe ore-deposit structures are controlled by ductile shear zone (DSZ), especiallyby deep-seated DSZ with well-developed ore-deposit structures. In the DSZ, var-ious kinds of macro- and micro-structures have their own characteristics; my-lonites are well developed; the marks of structural elements and deformationenvironments are distinct; and the occurrence of Au-deposit is closely related tothe structures of DSZ. Hetai gold-deposit is classified as an Au-deposit of DSZ type. The so-called"Au-deposit of Shear Zone Type" suggests that its occurrence is strictly control-led by DSZ with shearing as main metallogenic mechanism, and it may be sub-divided into two categories, namely the shear-zone dissemination-mylonite typeand the sheear-zone vein type. These two types of Au-deposit are products fromdifferent stages of progressive shear deformation, and restricted within differentorders of structures in the shear zone.