DOI:
矿床地质:2001,Vol.>>Issue(4):378-384

滇黔桂地区卡林型金矿床成因探讨
中国科学院地球化学研究所矿床地球化学开放实验室
Analysis of Genesis of Carlintype Gold Deposits in Yunnan-Guizhou-Guangxi Triangle Area
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中文摘要:矿化剂和沉淀富集剂是成矿物质中的重要组成部分,也是人们分析成矿作用和建立成矿模式的基础。在分析滇黔桂地区金矿成矿地质特征和成矿流体的基础上,提出该类矿床的矿质主要来源丁被动陆缘沉积建造,促使金活化、迁移的矿化剂主要是盆地热卤素流体和有机质流体,促使金局部沉淀富集的沉淀富集剂则主要是沉积建造内和深源富硫的流体和热液改造的有机质。认为矿质、矿化剂和沉淀富集剂在有利容矿空间的耦合是形成滇黔桂地区卡林型金矿的主要成矿机制,并在此基础上讨论了卡林型金矿的成因和成矿模式。
Abstract:Metallogenic materials usually contain metals, liquid, minerlizers and precipitation enrichment reagents. Among them, the mineralizer and the precipiation enrich ment reagent play important roles in the ore-forming process and constitute the basis of analysing ore genesis and metallogenic model. Based on an analysis of the metallogenic characteristics and the metallogenic fluids of Carlin- type gold deposits in Yunnan- Guizhou- Guangxi triangle area, the authors hold that the metallogenic metals are mainly derived from ore-bearing formations in the passive continental margin, controlled by lithology and lithofacies. The mineralizers that mobilize metallogenic metals and make the m migrate are hot halogen and organic matters in sedimentary basin. F-, C- and organic matters can extract and adsorb metals from the ore-bearing formation to form metallic complexes and organo- metallic compounds. These metallic complexes and organo-metallic compounds can be transported into the host structure and concentrate the metallognic metals. The precipitation enrichment reagents that cause local enrichment and precipitation of metallogenic metals are sulfur-rich fluids and hydrothermal alteration organic matters, which may come either from the sedimentry basin or from the mantle (deep source). The entry of sulfur- rich fluids can change the physical-chemicial conditions of the transportation and migration of solutions. The pH, Eh variations cause the decomposition of the metallic complex and the organo-metallic compound. The Au3+ may be reduced into native gold and be trapped to form microinclusive gold in pyrite and arsenopyrite. Au+ and As+, Sb+, Hg+ can be combined with H2S to form gold-bearing sulfides or be adsorbed at the surface of pyrite and arsenopyrite with the change of physical-chemicial conditions. All these factors result in the local precipitation and enrichment of the metallogenic metals. The mineralization of Carlin-type gold deposit results from the coupled action of mineralizers and precipitation enrichment reagents with metallogenic metals in favourable host structures. On the basis of the above understanding, the ore genesis and the metallogenic model of Carlin-type gold deposits are discussed.
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基金项目:国家杰出青年基金项目( 49925309)、中国科学院知识创新工程项目(KZC X2-102)和中国科学院矿床地球化学开放研究实验室基金(2000)
引用文本:
贾大成,胡瑞忠.2001.滇黔桂地区卡林型金矿床成因探讨[J].矿床地质,20(4):378~384
.2001.Analysis of Genesis of Carlintype Gold Deposits in Yunnan-Guizhou-Guangxi Triangle Area[J].Mineral Deposits20(4):378~384
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