划分金矿化集中区的基本准则

THE DELIMITING CRITERIA OF THE CONCENTRATED REGIONS OF GOLD MINERALIZATION

在划分和确认金矿化集中区时需研究的重要问题之一就是集中区的范围和界限.在现有的技术经济条件下,确定金矿化集中区的范围和边界应当以已知金矿床(点)的分布范围作为直观标志,以金的地球化学块体和各类含金建造的空间分布作为划分的基础,以控制各类含金建造和与金成矿关系密切的构造-岩浆活动等成矿要素的区域构造带或构造界面作为金矿化集中区的边界.利用上述准则确认了北山金矿化集中区.

The concentrated regions of gold mineralization,as the basic gold mineralizing units in the crust,are the geochemical provinces of gold element.They are the comprehensive expression of the material fields,energy fields and metallogenic spaces of the crust, reflecting the heterogeneity of gold distribution in the crust.In a concentrated region,accompanied by various geologic events during the geologic history,different types of gold deposits with dissimilar ages have formed.Even for a single deposit, there are multi stage superimpositions with different genesis.Thus in some regions, gold deposits display congenesis and inheritance.The gold bearing formations developed in concentrated regions are the important foundation for mineralization.One of the most important matters in identifying and delimiting the concentrated regions of gold mineralization is to study the range and boundary of the region. To achieve that,the distribution of known gold deposits and occurrences should be considered as the direct indicator. The base for delimitation is the range of gold geochemical blocks and auriferous formations.The boundaries of concentrated regions should be the regional tectonic belts or contacts that control the gold formations and the structural magmatic activities closely related to gold metallization.By such criteria,the Beishan concentrated region of mineralization is identified as an example.