Geochemical Characteristics of Stable Isotopes and REE at the PHAPUN Gold Deposit in Laos
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摘要: 爬奔金矿位于丰沙里-帕府(泰国)中生代拗陷带与琅勃拉邦-梨府(泰国)华力西褶皱带的交接部位,属于岩浆期后低温热液型矿床.文章通过对爬奔金矿床含金方解石氢、氧、碳同位素组成和稀土元素地球化学特征的研究,探讨成矿溶液中水、碳来源以及成矿溶液的演化问题.研究表明,热液流体来源主要是岩浆水与地层封存的古大气降水.矿石中方解石的碳、氧同位素13CV-PDB(‰)值分布在-4.5~-5.2之间,18OV-SMOW(‰)值分布于20.0~20.8之间, 表明含金方解石矿物为热液流体与二叠纪海相碳酸盐岩相互作用的产物.Abstract: The PHAPUN gold deposit, located at the intersection site of the Fengshali-Pafu(Thailand) Mesozoic depression belt and Luangprabang(Laos)-Lifu(Thailand) Hercynian fold belt, belongs to post-magmatic epither-mal type gold deposit. Through a detailed study on characteristics of hydrogen, oxygen, carbon isotopic composi-tions and the REE distribution patterns of ore-bearing calcites in PHAPUN gold deposit, we try to figure out the resources of H2O and C in the ore-forming fluids and evolution of ore-forming fluids. The results reveal that ore-forming fluids are mainly derived from magmatic water and ancient meteoric water. The C and O isotopic compositions of The 13CV-PDB(‰) and 18OV-SMOW(‰) of calcites in ores range from-4.5~-5.2 and 20.0~20.8, re-spectively, which show that ore-bearing calcites were the interacted products of hydrothermal fluids and the Perm-ian marine carbonate rocks.
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Key words:
- geochemistry /
- stable isotope /
- rare earth element /
- PHAPON gold deposit /
- Laos
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