澜沧老厂多金属矿床成矿地质体特征  

Geological Characteristics of Ore-bearing Rocks in Laochang Polymetallic Deposit,Lancang County

作　　者：刀艳[1] 杨帆 李峰[1] 余璨[1] 

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]中国有色金属工业昆明勘察设计研究院,云南昆明650093

出　　处：《金属矿山》2015年第5期145-148,共4页Metal Mine

基　　金：云南省自然科学基金项目(编号:2011FZ035)

摘　　要：澜沧老厂矿区广泛分布的火山岩和花岗斑岩被分别作为火山喷流沉积成矿系统和深部斑岩热液成矿系统的主要成矿地质体。对火山岩中的橄榄玄武岩中的钛磁铁矿进行能谱分析,对杏仁状钠粗面质熔岩不同矿物和杏仁状钾质粗面质熔岩微晶钾长石分别进行电子探针分析,并对矿区火山岩年代、岩石学等特征,花岗斑岩年代、成因、源区及围岩蚀变进行全面总结。结果表明:1火山岩成岩时代为早石炭世,是矿区Ag-Pb-Zn矿重要的含矿岩性,矿区火山作用控制着矿床的时空分布,为成矿提供了物质基础以及重要的热源驱动力;2隐伏花岗斑岩为矿区斑岩型钼矿成矿母岩,花岗斑岩的侵入时期属于喜山早期岩浆活动事件;3早石炭世火山作用以及喜山期岩浆活动,为叠加成矿系统的形成提供了非常有利的条件。上述研究成果对于深入探究矿区成矿系统具有一定的参考价值。The Volcanic rocks and granite porphyry are widely distributed in Laochang mining area, Lancang county,which are regarded as the main metallogenic geological body of volcanic gush flow depositing metallogenic system and deep por-phyry hydrothermal metallogenic system. The titanium magnetite in the olivine basalt of the volcanic rocks is conducted onspectrum analysis, the different minerals of amygdaloidal sodium trachyte lava and the microcrystaline potassium feldspar of al-mond-shaped potasium trachyte lava are analyzed by electron microprobe respectively. Besides that, the times and petrologicalcharacteristics of volcanic rock, the times, cause, source area and wall rock alteration characteristics of granite porphyry in min-ing area are summarized comprehensively. The analysis results show that （1）the volcanic diagenetic age is the early carbonifer-ous epoch, and it owns the important ore-bearing lithology of the Ag-Pb-Zn mine in mining area, the space-time distribution ofthe ore deposit is controlled by the mining volcanism, which provides materials basis and important driving force of heat sourcefor metallogenic activity;（2）concealed granite porphyry is the porphyry molybdenum ore-forming parent rock in mining area, andthe granite porphyry intrusion period belongs to the early himalayan magmatic activity;（3）the early carboniferous volcanism andmagmatism in himalayan period provide favorable conditions for the formation of metallogenic system. The above research re-sults have some certain reference value for analyzing the metallogenic system.

关 键 词：火山岩 隐伏花岗斑岩 成矿岩体 叠加成矿系统 

分 类 号：TD11[矿业工程—矿山地质测量]