矿床结构模型与某些类型金矿床定位预测

TEXTURE MODEL OF ORE DEPOSITS AND POSITIONING PROGNOSIS OF SOME TYPES OF GOLD DEPOSITS

矿床结构模型是基于多种地质背景下，对以热液成因为主的金矿床的大量找矿实践工作经验的理论思考，是对矿床的４维构架和矿体在矿床３维结构框架内占位规律研究方法的归纳。其主要目的是更有效地开展隐伏矿床的定位预测，从实践和理论上建立起一种有序化、可操作的预测方法。指出隐伏金矿床的“定位预测”实质上是确定深部最有利的成矿、赋矿构造部位。合理采用多种预测方法是必需的，但最主要的方法是控矿构造分析。矿床结构模型研究的思想方法也适用于其它类型的矿床和区域成矿预测。以团结沟金矿为例，阐述了建立金矿床结构模型的基本思路和建立模型的操作程序。

Although the development of theories and methods for positioning prognosis of concealed gold deposits is difficult,they are being widely explored by geoscientists in the world.The paper introduces a kind of new idea and method:“texture model of ore deposits” which is theoretically based on a great deal of geologic prospecting experience of gold deposits,chiefly of hydrothermal genesis,under different kinds of geologic background.As a combined concept of dynamic metallogenic processes and static prospection mode,the model consists of three basic parts:the rank of ore control structures,the time sequence of ore control structures,the spatial allocation pattern of ore bodies.This can be regarded as the practical description of knowledge on the 3Dt framework of ore deposits,the emplacing geometrical regularities of ore bodies in 3D texture framework of ore deposits,the distribution pattern of element geochemical fields,ect.The main goal of the model is to carry out the positioning prognosis of concealed ore deposits more effectively and to establish a kind of orderly and operational predicting procedure both in theory and practice.The connotation,significance,scope of application and four main points of the model have been discussed.The key aspect of “positioning prognosis” of concealed gold ore bodies is to propose the most favorable metallogenic and exiting structural positions.It is necessary to properly use all kinds of predicting methods,but the main method should be the analysis of ore control structures.The ideas of texture model of ore deposits can be applied in other kinds of ore deposits and regional metallogenic prognosis.Taking Tuanjiegou gold deposit as an example,the paper describes the basic thought and the operating procedure of establishing texture model of gold ore deposit.