四川牦牛坪稀土矿床地幔流体成矿的碳、氢、氧、硫同位素证据

Mantle Fluids Involved in the Ore-forming Process of the Maoniuping REE Deposit,Sichuan:Evidence of C,H,O and S Isotopes

选取 2种主要矿石类型———碳酸岩伟晶岩型矿石和重晶石伟晶岩型矿石进行了成矿流体的C、H、O、S同位素测试 ,获得δ13 CV PDB值为 - 3.0‰～ - 5 .6‰ ,δDV SMOW 值为 - 5 7‰～ - 88‰ ,δ18OH2 O VSMOW 值为 8.0‰～ 13.3‰ ,δ3 4 SV CDT值为3.3‰～ 5 .9‰ ,以及方解石的δ13 CV PDB值为 - 6 .9‰和δ18OV SMOW 值为 7.3‰～ 7.4‰。所有这些数据表明 。

The two most important types of ores, i.e., barite pegmatite ores and carbonatite pegmatite ores, were chosen to analyze the carbon, hydrogen, oxygen and sulfur isotopic components of the ore-forming fluids.δ 13C V-PDB ratios are -3.0‰～-5.6‰, δD V-SMOW ratios are -57‰～-88‰,δ 18O H 2O-VSMOW ratios are 8.0‰～13.3‰,δ 34S V-CDT ratios are 3.3‰～5.9‰, and δ 13C V-PDB and δ 18O V-SMOW ratios of calcite are -6.9‰ and 7.3‰～7.4‰, respectively. The data obtained suggest that large quantities of mantle fluids were involved in the ore-forming process of the Maoniuping REE deposit.