构造体系复合研究及其控矿意义

COMPOUNDING OF STRUCTURE SYSTEMS AND ITS SIGNIFICANCE FOR CONTROLLING ORE DEPOSITS

本文以某矿田为例,在构造体系研究的基础上,着重论述了构造多次活动引起物质组分、地球化学元素和矿物形态的多次变化,并通过光弹性实验,模拟成矿期构造应力在成矿前构造体系基础上的活动。认为,成矿前构造体系格架不但对矿床分布起到控制或影响,而且发现成矿前构造岩物质组分的变化,往往为后期矿化富集创造了有利的条件。

To establish a structural system by use of the geomechanical method in study-ing the structures of an ore field, it is necessary first of all to ascertain the entirehistory of the activity of the ore field structures in connection with the data of theregional geology of the ore field. As the manners of dynamic processes were differ-ent in multiple structural activities, the structural system that controlled the forma-tion of ore deposits is established by means of determining that the metallogenicepoch is mainly related to the structural activity of which dynamic process. Inprospecting and exploration work, one should pay attention not only to the study ofthe structural system during the metallogenic epoch but also to the study anddetermination of pre-ore stuctural systems. Based on the study of the structural system of a certain ore field, this papermainly discusses the variations in material components, geochemical elements andmorphology of minerals caused by multiple structural activities: and the structuralactivity in the metallogenic epoch on the basis of the pre-ore structural systemwere simulated throush experiments by photoelastic methods. It is considered thatthe framework of pre-ore structural systems not only controlled or influenced thedistribution of ore deposits, but also brought about variations of the composition ofpre-ore tectonite, which usually created favomable conditions for mineralization andore concentration.