西藏多龙矿集区波龙斑岩铜矿床蚀变与脉体系统  

Mineralization,alteration and vein systems of the Bolong porphyry copper deposit in the Duolong ore concentration area,Tibet

作　　者：杨毅[1] 张志[1] 唐菊兴[2] 陈毓川[2] 李玉彬 王立强[2] 李建力 高轲[1] 王勤[1] 杨欢欢[1] 

机构地区：[1]成都理工大学地球科学学院,四川成都610059 [2]中国地质科学院矿产资源研究所,北京100037 [3]西藏自治区地质矿产勘查开发局第五地质大队,青海格尔木816000

出　　处：《中国地质》2015年第3期759-776,共18页Geology in China

基　　金：青藏专项优选项目(12120113037400);国家自然科学基金项目(41172077);国家重点基础研究发展规划"973"项目(2011CB403103)联合资助

摘　　要：波龙铜矿床是多龙矿集区继多不杂斑岩铜矿床后发现的又一大型斑岩铜矿床。文章在详细的野外地质编录及室内镜下鉴定基础上,对波龙斑岩矿床蚀变与脉体系统进行系统梳理。结果表明,波龙矿床发育明显的蚀变分带,从深部(或核部)往浅部(或外侧)具有钾化带→黄铁绢英岩化带→泥化叠加黄铁绢英岩化带→角岩化带(或外侧的青磐岩化带)的蚀变分带特征。共识别出M、A、B、D 4种脉体类型,以A、B脉最为发育。与成矿关系密切的主要为钾化带、黄铁绢英岩化带及A、B脉。与国内外典型斑岩矿床蚀变特征相比,波龙矿床蚀变特征总体与"二长岩"模式相似,特征矿物组合与阿根廷Bajo de la Alumbrera矿床,国内驱龙铜矿、多不杂铜矿等都具有相似之处。但波龙矿床从钾化带至黄铁绢英岩化带都大量发育的稀疏-稠密浸染状及脉状磁铁矿是该矿床的独有特色。The Bolong copper deposit is another large-size porphyry deposit discovered after the Duobuza porphyry copper depositin the Duolong ore district. In this paper, the authors systematically investigated the alterations and vein systems in the Bolong copper deposit based on field geological records and indoor microscopic identifications. The results show that the Bolong copper deposit is characterized by obvious alteration zonation of potassic zone→pyrite phyllic zone→argillation superimposed pyrite phyllic zone→hornfels zone（or propylitization zone on the outer side） from the deep part（core） to the shallow part（or the outer side）. Four types of veins（M, A, B, D） can be recognized in the deposit, with A B veins being most developed. the potassic zone,pyrite phyllic zone and A, B veins are related to the mineralization. A comparison with the typical alteration features of porphyry deposits both in China and abroad shows that the alteration features of the Bolong copper deposit are similar to features of the＂monzonite＂model, and the characteristics of the mineral assemblages are similar to those of the Bajo de la Alumbrera porphyry Cu deposit in Argentina and the Qulong copper deposit and Duobuza copper deposit in Tibet. However, the Bolong deposit has its unique feature that it possesses a large number of sparsely- densely disseminated and veined magnetites from the potassic zone to the pyrite phyllic zone.

关 键 词：蚀变 脉体 斑岩铜矿 波龙 多龙矿集区 

分 类 号：P618.41[天文地球—矿床学]