| 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。 |
| 关键词: 爬立山铁矿 二长花岗斑岩 矽卡岩型 老挝 |
| DOI： |
| 附件 |
| 投稿时间：2015-04-22修订日期：2015-06-29 |
| 基金项目: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 |
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| Geochemistry and mineralization of the monzonite granite-porphyry from the PhuPhaLek iron deposit, Laos |
| GAO Jian-hua, FAN Wen-yu, WU Zhen-bo, WANG Hong |
| (Chengdu Center, China Geological Survey, Chengdu 610081, Sichuan, China) |
| Abstract: |
| The PhuPhaLek iron deposit, Laos in the northwestern part of the Truongson fold belt occurs as a large-sized 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. |
| Key words: PhuPhaLek iron deposit monzonite granite porphyry skarn-type Laos |
