Abstract
Fluorites are one of the main vein minerals in the Maoniuping REE deposit, Sichuan Province, China. This paper analyzes the Sr and Nd isotopic compositions of fluorites in the orefield. Their ( 87Sr/ 86Sr)o and ( 143Nd/ 144Nd) 0 (0.706031–0.706237 and 0.512370–0.512412, respectively) are similar to those of carbonatites (0.706074–0.706149 and 0.512383–0.512406, respectively) and syenites (0.705972–0.706302 and 0.512378–0.512405, respectively) in the orefield and all lie in the narrow range between EM I and EM II in the diagram of ( 87Sr/ 86Sr) i vs. ( 143Nd/ 144Nd) i. In combination with other geological and geochemical data, we suggested that the ore-forming fluids of the Maoniuping REE deposit mainly came from syenitecarbonatite magmas.
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