扬子地块东南缘板岩带中韧性剪切带对金矿的控矿作用

扬子地块东南缘板岩带中剪切带金矿床主要有三种成因类型，即糜棱岩型、石英脉型及蚀变岩型，剪切带对其形成具有明显控制作用.矿体主要受控于如下构造：1-4级多级构造，是由韧性剪切带和脆-韧性剪切带或脆性断层所组成，构造形态变化地段，包括弧形剪切带顶部扩容区及剪切带交汇部位；构造强应变及其叠加部位，这些地段系由超糜棱岩、糜棱岩、碎裂岩所组成；构造多期变形地段。本文还建立了板岩带剪切带型金矿床的动力成矿模式；划分了金矿形成四个阶段，即背景岩石形成；成矿物质运移；主期动力成矿及矿床改造、再造阶段。

ORE-CONTROL ACTION OF DUCTILE SHEAR BELT WITHIN SLATE ZONE ON GOLD DEPOSIT ON THE SOUTHERN MARGIN OF YANGTZE PLATFORM

Three genetic types of gold deposit are discerned in the shear belt within the slate zone on the southern margin of Yangtze platform as follows; mylonitic, quartz vein and altered rock types. Gold deposit is obviously controlled by the shear belt. Ore bodies depend mainly on the following structures; multi-order structures of first to fouth orders made up of ductile and brittle-ductile shear belts or brittle faults; structural deformation areas, including dilatio areas of the top of arc shear belt and the conjoining areas of shear belts; areas of strong structural strain and their superimposition composed of ultramylonite, mylonite,; and cataclasite; multideformed areas. Dynamic model of gold deposit is established in the slate shear belts. Four stages of gold deposit are discerned as follows : the formation of background rock, movement of ore-forming materials, major dynamic mineralization and the reworking and reconstruction of the deposits.