秦巴地区金矿物自然重砂异常形成机理及其找矿意义

FORMATION MECHANISM OF GOLD HEAVY MINERALS ANOMALY AND ITS INDICATION OF QINBA AREA

重砂法是一种古老而有效的找矿方法,迄今已有两千年的历史。以秦巴地区金矿为背景,收集大量原生金矿床、砂金矿床和金矿物自然重砂等资料的基础上,从砂金矿床金粒特征、岩金矿金粒特征、自然重砂金矿物特征几个方面对含金矿物种类、自然金粒大小、成色、结构构造等进行对比分析,运用现代物理及化学搬运、沉淀机理,深入剖析水动力情况下水的流速与岩屑或自然金粒粒径的关系,氧化环境或氯离子存在的溶液中金的络合物形成、分解、沉淀的过程,对金矿物异常与含金地质体(金矿床点)之间的内在联系和规律进行了分析探讨,并划分了金矿物异常种类,为预测金矿产类型提供依据。

Heavy mineral method is an ancient and effective prospecting method, it had been adopted since two thousand years ago. This paper based on Qinba＇ s primary gold deposits, placer gold deposits and gold heavy minerals data, analyzes gold-bearing minerals, gold particle size, grade, and texture from placer gold deposit, primary gold deposit and gold heavy minerals, uses physical and chemical transportation, sedimentary mechanism to study the relation between flow speed and debris or natural gold particle size under water dynamics, formation, decomposition and sedimentary process of gold complex in oxidized environment or in chloride ion solution, and discusses the relation between gold minerals anomaly and gold deposits （gold-bearing geological units） , and classifies gold minerals anomaly types, providing references for predicting gold types.