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木落寨稀土矿床在构造上位于西南新生代陆内造山带的锦屏山北缘。文章通过对木落寨2个坑道的矿石样品的C、H、O、S同位素组成的系统研究,探讨了木落寨稀土矿床成矿流体的来源及其与深部过程的关系。研究表明,石英和萤石的δ13CV_PDB值为-2.5‰～-9.0‰,方解石、石英、萤石和氟碳铈矿的δDV_SMOW值为-63‰～-87‰,萤石和石英的δ18O水V_SMOW为10.0‰～15.5‰,重晶石和方铅矿的δ34SV_CDT值分别为0.1‰～2.2‰和-8.6‰～-9.3‰,方解石的δ13CV_PDB和δ18OV_SMOW分别为-6.6‰～-6.8‰和8.4‰～9.1‰。所有这些数据均显示木落寨稀土矿床在成矿过程中有大量地幔流体的参与,表明其成矿作用与深部过程有关。
Muluzhai rare earth deposits are structurally located in the northwestern margin of Jinping Mountain in the southwestern Cenozoic intracontinental orogenic belt. In this paper, we systematically studied the C, H, O and S isotopic composition of ore samples from two tunnels in Muluzhai, and discussed the source of ore-forming fluid and its relationship with deep process in Muluzhai REE deposit. The results show that the δ13CV_PDB values of quartz and fluorite range from -2.5 ‰ to -9.0 ‰, the δDV_SMOW values of calcite, quartz, fluorite and bastnaesite are -63 ‰ ~ -87 ‰, and the δ18O water V_SMOW of fluorite and quartz is 10.0 ‰ ~ 15.5 ‰. The δ34SV_CDT values of barite and galena range from 0.1 ‰ to 2.2 ‰ and -8.6 ‰ to -9.3 ‰, respectively. The δ13CV_PDB and δ18OV_SMOW of calcite are -6.6 ‰ -6.8 ‰ and 8.4 ‰ -9.1 ‰ respectively . All of these data show that Muluzhai rare earth deposit has a large amount of mantle fluid during the mineralization process, indicating that its mineralization is related to the deep process.