老挝爬立山铁矿二长花岗斑岩地球化学特征及其成矿意义  

Geochemistry and mineralization of the monzonite granite-porphyry from the Phu Pha Lek iron deposit,Laos

作　　者：高建华[1] 范文玉[1] 吴振波[1] 王宏[1] 

机构地区：[1]中国地质调查局成都地质调查中心,四川成都610081

出　　处：《沉积与特提斯地质》2015年第3期102-108,共7页Sedimentary Geology and Tethyan Geology

基　　金：海上丝绸之路经济带境外矿产资源潜力评价项目(编号12120114018701);老挝沙耶武里及邻区优势矿产资源潜力调查与分析

摘　　要：老挝爬立山铁矿位于长山褶皱带北西端,为一个大型矽卡岩型铁矿床。铁矿化产于二长花岗斑岩的内、外接触带。二长花岗斑岩具有富碱,硅、铝过饱和的特征,属钙碱性岩。微量元素配分模式与正常大陆弧花岗岩类似,稀土配分模式为右倾轻稀土富集型,正铕异常,轻重稀土分馏明显,属下地壳重熔被动侵位形成的"S"型花岗岩。岩体U-Pb年龄为283±2.9Ma,侵位时间为早二叠世。爬立山铁矿床潜在资源量巨大,外围地区具有相同类型铁矿床的找矿远景。The Phu Pha Lek iron deposit,Laos in the northwestern part of the Truongson fold belt occurs as a largesized skarn-type iron deposit. The mineralization occurs within the inner-outer contact zone of monzonite granite porphyries. The monzonite granite porphyries have enriched alkali and oversaturated Si and Al,and are assigned to the calc-alkaline rocks. The trace element distribution patterns are similar to those of the normal continental arc granites. The rare earth element distribution patterns display right-leaning LREE-enriched patterns with positive Eu anomaly and marked fractionation of LREE and HREE,suggesting the ＂S＂-type granites created by the remelting and intrusion of the lower crust melts. The SHRIMP U-Pb age of 283 ± 2. 9 Ma indicates that the emplacement took place during the Early Permian.

关 键 词：爬立山铁矿 二长花岗斑岩 矽卡岩型 老挝 

分 类 号：P594.1[天文地球—地球化学]