| 云南北衙表生金矿形成与保存探讨 |
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| 引用本文：.2003.Formation and Conservation of Beiya Epigenetic Deposit, Yunnan Province[J].Mineral Deposits,22(4):401~407 |
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| 基金项目:云南省省院省校合作项目(编号：YK98008)的部分成果，并得到国家自然科学基金项目(编号：40272090) |
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| 中文摘要:通过对云南北衙地区表生金矿形成的地质背景、矿床特征等的研究， 重点探讨了其特殊的形成与保存条件。认为北衙地区的表生金矿是“古砂矿”，它的巨大蕴 藏量主要得益于其特殊的形成与保存条件：丰富的原生金矿为其提供充足的成矿物质，特别 发育的古喀斯特洞穴为“古砂矿”提供了特殊的储存空间，强烈的气液爆破作用形成的热水 角砾盖层为其提供了良好的保存条件。 |
| 中文关键词:地质学 喀斯特洞穴 火山气液爆破 热水角砾岩 古砂矿 北衙 |
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| Formation and Conservation of Beiya Epigenetic Deposit, Yunnan Province |
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| Abstract:In Beiya district, the epigenetic gold deposits are actually “paleoplacer” dep osits. Their formation has no essential difference from that of modern placer de posits in South China. The preservation of large quantities of gold resources is attributed to the special conservation conditions in Beiya. Various karst caves provided the necessary sites for epigenetic mineralization, while the breccias produced by gas_liquid explosion provided the excellent conservation environment . In this paper, the epigenetic gold deposits are divided into three main types, i.e., paleoplacer deposits of river_lake phase, paleoplacer deposits of surface -covered karst fracture_caves, and paleoplacer deposits of paleo_weathering crus t. The genesis of each kind of paleoplacer deposits is investigated, and the con servation of the paleoplacer deposits is emphatically discussed. |
| keywords:geology, karst caves, volcanic gas_liquid explosion, hydrothermal breccia, paleoplacer, Beiya |
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