Abstract
Ore-forming solutions and the origin of mineralizing material in the Dalucao rare earth deposit were studied by means of H, O, C, and Si isotope analyses. The δ13C of the bastnasite range narrowly from −8.1‰ to−8.0‰, while the δD values range from −89‰ to −79‰. The quartz δ30Si of the orebody is −0.3‰, and the δD and δ180 of the quartz-fluid inclusion range from −87‰ to +6.0‰, respectively. The δD and δ180 values of the fluorite-fluid inclusion in the ore body are −99‰ to −11.6‰, respectively. The study shows that the compositions of hydrogen and oxygen isotopes in oreforming fluid of Dalucao rare earth deposit lie in the region between magmatic water and meteoric water. Therefore the ore-forming fluid was mixed from magmatic and meteoric water. The carbon isotopic features suggest that carbon of the bastnasite was from the mantle, carbon of fluorite-fluid inclusions in the ore body was from a mixture carbon source, and carbon of quartz-fluid inclusions was from the mantle.
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