Two Periods Rare Metal Mineralization of the Pegmatite in Jiulong Area, Western Sichuan

Western Sichuan is one of the important rare metal producing areas in China. There are Lijiagou, Yelonggou, Jiajika and other super-large lithium beryllium deposits, which are formed at the age of 220~200 Ma. The paper summarizes the characteristics of rare metal deposit, the diagenetic and metallogenic ages of the related granites in Jiulong area. Jiulong is dominated by beryllium deposit, and the lithium deposits are mainly related to the Early Yanshanian A-type granite in Jiulong area. There may be two periods rare metal mineralization (165~150 Ma and 200~180 Ma) in Jiulong area, which is obviously different from that rare metal ore concentration area in the Jiajika, keeryin, Zhawulong. The absence of lithium in Jiulong area due to deep cut and denudation suggests that beryllium-niobium and tantalum ore bodies may be mainly located in the deep of Jiajika ore concentration area in Yajiang Basin. This discovery poses a challenge to the traditional view that rare metals mineralization is associated with S- and I- Type granite, enriched the theory of granite and rare metal mineralization and pointing out the direction of rare metal prospecting in the Jiulong region.