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与区域变质作用有关的钨矿床及控矿因素
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  • 英文篇名:TUNGSTEN DEPOSITS RELATED TO REGIONAL METAMORPHISM AND ORE—CONTROLLING FACTORS
  • 作者:王发宁
  • 英文作者:Wang Faning Jiangxi Institute of Geological Sciences,Xiangtang, Jiangxi
  • 中文刊名:地质论评
  • 英文刊名:Geological Review
  • 机构:江西地质科学研究所 向塘
  • 出版日期:1989-06-30
  • 出版单位:地质论评
  • 年:1987
  • 期:05
  • 语种:中文;
  • 页:28-30
  • 页数:3
  • CN:15-1228/S
  • ISSN:1672-5190
摘要
区域变质和超变质作用是受变质岩石中钨元素聚集定位而形成矿床的重要地质因素。在华南地区,按变质成矿作用的不同特点,可划分为变质热液钨矿床、混合岩化热液钨矿床和花岗岩化钨矿床三大类型。中元古界—古生界中的含钨沉积建造,是变质成矿的物质基础;含矿流体的形成,是变质成矿的重要环节;有利的控矿构造和地球化学障,是促使成矿流体中矿质聚集淀积的重要因素;混合岩化前锋外缘,是成矿物质汇聚的重要场所;印支—燕山期花岗岩化,在区域成矿中有重大意义;多期变质作用叠加的复变质带,为成矿的有利地区。
        Regional metamorphism and ultrametamorphism are important geological fac-tors for concentration and localization of tungsten in metamorphic rocks and theformation of ore deposits of commercial value. According to different features ofmetamorphic metallization, tungsten deposits in South China can be grouped intothree broad classes: hydrothermal deposits related to metamorphism, hydrothermaldeposits related to migmatization and hydrothermal deposits related to granitiza-tion. In the South China region, the tungsten-bearing sedimentary formation of mid-die Proterozoic to Palaeozoic ages are the material basis of metamorphic metalli-zation; the formation of metamorphic hydrothermal solutions and migmatized hy-drothermal solutions and other ore fluids are the important links of metamorphicmineralization; tectonic fractured zones, fissure zones, ductile shear zones, "saddle"space formed by detachment of adjacent layers commonly seen in the core of ananticline, "acid-alkaline barrier" and "oxidizing-reducing barrier" between rocks ofdifferent chemical properties and "enrichment barrier" in rocks containing elementspossessing chemical affinity to tungsten, all these are important factors facilita-ting the accumulation and deposition of ore materials in ore fluid; the outer mar-gin of the migmatization front is commonly the important site for the concentra-tion of ore materials and the margins of a migmatite field is a favourable zone forminerallzation; the In?osinian-Yanshanian period is an impor tantmetallogenic epochfor endogenic tungsten deposits in South China, and intense granitization plays avital role in regional metallization; composite metamorphic zones superimposed by polyphase metamorphism are commonly distributed in a folded-faulted uplift regionwhere tungsten had undergone relatively complete differentiation and evolution,thusreadily forming metamorphic tungsten deposits of various types, and where tungs-ten deposits derived from crustal anatectic granites that bear a ceratin internal con-nection with regional metamorphism are distributed.
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