摘要
南坡金矿区地处印支陆块群墨江—黎府—罗文真火山弧带的北段,区内地质构造复杂,岩浆活动频繁。火山活动为金矿床的形成提供了丰富的物源,区域构造和派生裂隙是区内含金热液迁移的通道和容纳矿源成矿的场所。文章通过对区内矿床地质、控矿构造、矿石矿物蚀变组合特征等成矿地质条件的分析,将测区矿床成因类型暂定为地下热卤水参与的浅层低温热液黄铁矿脉构造蚀变岩型金矿床和二长花岗岩黄铁矿脉构造裂隙带蚀变岩型金矿床;从物源、成矿热动力、构造和围岩圈闭等4个成矿有利条件对南坡金矿床成因进行阐述,确立了找矿标志。
The Nanpo gold deposit is located in the northern part of Mojiang - Lifu - Luowenzhen island arc belt which belongs to Indo - Chinese continental plate group with complexity of geological structures and frequent magmatic activities. Volcanic activities provide a rich material sources for the formation of gold deposits, the regional structures and derived fractures provide the fluid moving channel and deposition space for the hydrothermal fluids. In this paper, the authors conducted the integrated analysis on metallogenic geological conditions such as regional mineral deposits, ore-controlling structures, ore mineral alteration assemblages etc. in this area, and concluded that the genesis of mineral deposits is an epithermal structure - controlling pyrite - vein altered type gold mineralization by the hot brines and the monzogranite - hosted fissure - controlling pyrite - vein altered type gold mineralization. Finally, the author discussed the genesis of Nanpo gold deposit in aspects of mineralization source, metallogenetic thermal engine, structures and countyrock trap structure. Based on the study results, the gold prospecting criteria were established in this area.
出处
《矿产勘查》
2012年第6期836-844,共9页
Mineral Exploration
关键词
南坡金矿
地质特征
矿床成因
找矿标志
老挝
Nanpo gold deposit
geological characteristics
deposit genesis
prospecting criteria
Laos
