| 安徽晓天中生代火山岩盆地金矿成矿地质条件 |
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| 引用本文： | 杜建国.安徽晓天中生代火山岩盆地金矿成矿地质条件[J].地质与资源,1992,1(4):207-213. |
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| 作者姓名： | 杜建国 |
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| 作者单位： | 安徽省地质矿产局313地质队 |
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| 摘 要： | 本文依据区内金矿床地质特征、矿化与火山作用、矿物流体包裹体的研究,阐明区内金矿成矿条件:火山岩基底变质岩是金矿"原始矿源岩";中生代岩浆部分熔融了"原始矿源岩"所形成的后生矿源岩"为金矿成矿提供了物质来源;毛坦厂组形成时期的火山活动及与之有关的火山(次火山)热液使金发生活化、迁移,并在有利部位富集成矿;火山构造及与火山活动有关的断裂构造控制了矿化部位.流体包裹体和稳定同位素研究结果表明,成矿热液主要来自天水,少量来自岩浆.成矿物质是在低fO2、fS2,pH≈7的弱还原条件下沉淀的.
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| 关 键 词： | 安徽 金矿 火山岩 |
GEOLOGICAL CONDITIONS OF GOLD DEPOSITS IN XIAOTIAN MESOZOIC VOLCANIC BASIN, ANHUI PROVINCE |
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| Du Jianguo.GEOLOGICAL CONDITIONS OF GOLD DEPOSITS IN XIAOTIAN MESOZOIC VOLCANIC BASIN, ANHUI PROVINCE[J].Geology and Resources,1992,1(4):207-213. |
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| Authors: | Du Jianguo |
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| Institution: | No. 313 Geological Party, BGMR, Anhui Province |
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| Abstract: | Studies of geological characteristics, mineralization and volcanism, fluid inclusion show that: 1. the basement of metamorphic rocks is the" Primary source rocks" and the "secondary source rocks" are derived from partly melted "primary source rocks" with Mesozoic magma; 2. Mesozoic Maotanchang-stage volcanic activity, as the important factor of the gold mineralization, activated gold to be migrated in volcanic hydrothermal solution and to be concentrated in favorable places forming gold deposits; 3. basement structures control certainly gold minerogenesis, volcanic structures control directly mineralization zonation and mineralization positions, e.g. gold deposits of subvolcanic hydrothermal type occurring around the crater of central type volcano and ones of volcanic hydrothermal type in one side of the crater of fissure-type volcano, and type of fault controls the kind, fineness, and zone of ores in a gold deposit; 4. the ore-forming hydrothermal solution consisting of mainly meteoric water and somefew magmatic water.
Studing the controlling conditions of gold minerogenesis of various genie types, the author proposes a minerogenetic series and minerogenetic model of gold and ore-reaching direction in this area. |
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| Keywords: | Anhui gold deposit volcanic rock |
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