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• 基础地质·矿床·盆地 • 上一篇    下一篇

富湾超大型银矿床Ar-Ar年龄、铅同位素特征及形成条件分析

梁华英1,喻亨祥2,曾提1,夏萍1   

  1. 1.中国科学院 广州地球化学研究所成矿动力学重点实验室,广州 510640;2.桂林工学院,广西 桂林 541004
  • 收稿日期:2006-07-14 修回日期:1900-01-01 出版日期:2006-09-26 发布日期:2006-09-26
  • 通讯作者: 梁华英

Studies on the Ar-Ar Age, Pb Isotope Features and Key Factors for the Formation of Fuwan Superlarge Silver Deposit in Guangdong Province

LIANG Hua-ying1,YU Heng-xiang2,ZENG Ti1,XIA Ping1   

  1. 1.Key Laboratory for Metallogenic Dynamics, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2.Guilin Institute of Technology, Guilin, Guangxi 541004,China
  • Received:2006-07-14 Revised:1900-01-01 Online:2006-09-26 Published:2006-09-26
  • Contact: LIANG Hua-ying

摘要: 富湾超大型银矿床主要为脉状,产于下石炭统灰岩与长坑赋金硅质岩接触带及其下的破碎带中。银矿床矿化石英40Ar-39Ar年龄为(64.3±0.1) Ma。矿床铅同位素μ值(10.67~10.95)与赋矿地层的μ值(9.79~10.33)不同,而与粤西地区元古宇基底中矿床的μ值(10.62~10.66)相似。富湾超大型银矿床成矿物质主要来自元古宙变质基底,矿床形成与三水盆地晚白垩世到早第三纪强烈火山活动形成的有利成矿环境有关。有利于形成富湾超大型银矿床地质条件包括:(1)深大断裂构造交汇及盆地边缘同生断裂构造组成的连通网;(2)特殊岩性组合形成的聚矿-圈闭环境;(3)丰富成矿物质源区、多期矿化及成矿元素多次活化迁移;(4)多期次火山活动形成的循环地热系统。

关键词: 银矿床, 超大型矿床, 矿床成因, 粤中

Abstract: The Fuwan superlarge silver deposit is hosted in the Early Carboniferous limestones along a contact fault zone between the limestone and the overlying Changkeng Au-hosting siliceous rocks. The 40Ar-39Ar age of the ore-related quartz veins from the Fuwan silver deposit is (64.3±0.1) Ma. The silver deposit is characterized by high μ values (10.67~10.95) in Pb isotopic composition, being much higher than those of the Paleozoic ore-hosted strata and being similar to those of ores hosted in Preterozoic metamorphic base in the Western Guangdong Province. It is concluded that the ore-forming material of the superlarge silver deposit came primarily from the Proterozoic basement. The superlarge silver deposit owns its origin to the Himalayan volcanic activities in the region of the Sanshui Basin.The formation of Fuwan superlarge silver deposit is controlled by the following favorable geological conditions: The intersection of deep faults and contemporaneous faults at the margins of the Sanshui Basin served as excellent passageways for ore fluids; the special ore-hosted rock association served as the ore-concentration and ore-trapping structures; the silver-rich basement,multiple stages of mineralization and of mobilization of silver and related elements; geothermal convection system related to multiple episodes of volcanic activities.

Key words: silver deposit, superlarge deposits, ore genesis, Central Guangdong Province

中图分类号: 

  • P618.52
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