粤西北庞西垌银（金）矿床控矿断裂特征与控矿规律

从成矿学角度,控矿断裂一方面起到了容矿空间的作用,另一方面也是成矿物质发生迁移、富集和沉淀的重要原因.从成矿预测角度,查明和获得找矿信息或找矿标志,尤其是那些容易识别的宏观找矿标志是找矿人更加关心的问题.庞西垌银(金)矿床是粤西北地区构造蚀变岩型银(金)矿床的典型代表之一.矿床产出受前寒武系及下古生界混合片麻岩与燕山晚期花岗岩之间的接触带断裂构造控制,矿体呈脉状、透镜状严格产于断裂带内部.断裂的形态、产状变化对矿体空间定位有明显的控制作用,多组控矿断裂的交叉复合是矿体加大变厚的直接原因.矿体产出与断裂构造内部特定的断裂构造岩、蚀变岩及其分带有关.

ORE-CONTROLLING STRUCTURES IN PANGXIDONG Ag( Au) DEPOSIT, NORTHWEST GUANGDONG: Characteristics and regularities of structural control to rebodies

Metallogenetically,ore controlling structure plays a role of ore holding space.On the other hand,it is an important reason for the migrateion,concentration and precipitation of ore forming material.For the purpose of metallogenetic prediction,however,prospectors pay more attention to ore searching information or indicators,especially those macroscopical signs that can be simply and easily identified.The Pangxidong Ag(Au) deposit is a representative of its type in Northwest Guangdong Province.It is hosted in the altered rock of ore controlling structure in the contact belt between Precambrian and Lower Paleaozoic compound gneiss and late Yanshanian granite.The orebodies are strictly restricted by the controlling structures in veins or lens.The variation of the forms and attributes of ore controlling structures obviously affect the positioning of orebodies.The intersecting of differently oriented structures is the direct reason for the widened and thickened orebodies.