钦杭成矿带东段钨成矿规律

Mineralization of the tungsten deposits in the eastern part of the Qinzhou-Hangzhou metallogenic belt in Jiangxi and Hunan

关键词:  钦杭成矿带东段  钨矿  成矿规律  区域找矿潜力

Key words:  eastern part of the Qinzhou-Hangzhou metallogenic belt  tungsten deposit  mineralization  exploration potential

摘要:

钦杭成矿带是我国一条重要的金属矿产成矿带，近年来随着朱溪和大湖塘两个世界级钨矿床的探明，更是引起了广泛关注。在综合分析已有资料的基础上，结合最新找矿勘查和研究成果，初步总结了钦杭成矿带东段钨矿成矿规律。认为区内钨矿床可划分为石英脉型、接触交代型、蚀变花岗岩（云英岩）型、斑岩型和复合型5种类型。在空间展布上具有区-带-田结构，在成岩-成矿时间上以燕山期为主（120~162 Ma），印支期（~225 Ma）次之，壳源重熔（S型）花岗岩与钨成矿关系尤为密切，次为I型花岗质岩浆。钨主要来源于岩浆岩，少部分亦来源于地层。完善了钦杭成矿带东段钨矿成矿模式，并分析了区内找矿潜力。

Abstract:

The Qinzhou-Hangzhou metallogenic belt is an important metallogenic belt in China. In recent years, much attention has been given to the Qinzhou-Hangzhou metallogenic belt for the discovery of two world-class Zhuxi and Dahutang tungsten deposits. The combination of the existing data and latest results of research, the present paper focuses on the mineralization in the eastern part of the Qinzhou-Hangzhou metallogenic belt. The tungsten deposits in the study area may be classified into five types:quartz vein type, contact metasomatic type, altered granite (greisen) type, porphyry type and composite type. These tungsten deposits are characterized by the distribution of ore district-ore belt-ore field patterns. The diagenesis-mineralization ages are assigned primarily to the Yanshanian (120 to 162 Ma) and subordinately to the Indosinian (ca. 225 Ma). The tungsten mineralization has the affinity to the crust-derived remelted (S-type) granitic magmas, and also to the I-type granitic magmas, and the element tungsten is derived mainly from the magmatic rocks and basement strata composed of the marine volcanic-sedimentary formations. The eastern part of the Qinzhou-Hangzhou metallogenic belt is interpreted to have the great potential of the exploration of the tungsten deposits.