尕龙格玛铜锌多金属矿区火山岩特征  

Characteristics of volcanic rocks from Galonggema Cu-Zn polymetallic mining area

作　　者：吴碧娟[1,2] 赖健清[1,2] 郑宗学 吴远安 

机构地区：[1]中南大学有色金属成矿预测教育部重点实验室,湖南长沙410083 [2]中南大学地球科学与信息物理学院,湖南长沙410083 [3]青海有色地质矿产勘查局地质矿产勘查院,青海西宁810007

出　　处：《矿产与地质》2013年第4期283-291,共9页Mineral Resources and Geology

基　　金：中央地质勘查基金项目(编号:2009631002)

摘　　要：尕龙格玛铜锌多金属矿区岩浆活动强烈,火山岩分布广泛,其展布受区域构造的控制作用明显。通过野外地质调查及对尕龙格玛铜锌多金属矿区火山岩系的岩石矿物组合和结构构造、岩石化学成分、地球化学特征的研究,初步确定了矿区的火山机构及其岩相构造的基本特征。通过对该区英安岩地球化学特征的分析,揭示了矿区在三叠纪时期处于岛弧的大地构造背景;英安岩的形成可能是由于古特提斯洋壳俯冲,引起幔源物质与深海沉积岩共同熔融形成的基性岩浆不断分异演化而形成的。Magmation is severe in Galonggema Cu-Zn polymetallic mining area,and volcanic rocks which are controlled by regional tectonics are widely distributed.Based on field geological investigation and indoor re- search on rock constituents and structural tectonics,petrochemical components,and geochemical characteris- tics of volcanic rock series in Galonggema Cu-Zn polymetallic mining area,the characteristics of volcanic edi- fice and its petrographic structure are initially verified.Analysis on geochemical characteristics of dacite in this area indicates that the mining area in the Triassic period was within geotectonic setting of island arcs;the dacite was formed by differential evolution of basic magma which was formed by fusion of mantle-derived ma- terial and deep ocean sediment which was resulted from underthrusting of Paleotethys ocean crust.

关 键 词：火山岩 地球化学 火山机构 尕龙格玛 

分 类 号：P618.4[天文地球—矿床学]