科研之友
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摘要
The Guilinzheng Mo-W deposit is located in the northern part of Jiangnan tungsten mineralization belt (JWB), and its ore minerals are mainly high-Mo-bearing scheelite. Research shows that rare earth elements are enriched in high-Mo scheelite, in order to explore its enrichment mechanism, in-situ LA-ICP-MS trace elements analysis and mapping of orderly-stage high-Mo scheelite grains were conducted in this study. The results show that the total rare earth elements concentrations (∑REE) of the three-stage high-Mo scheelite ranged from 28.59× 10-6 to 4863.82×10-6, with average value of 789.21×10-6 (n=122), and the ∑REE gradually increased from 28.59× 10-6~1059.18×10-6, (Sch-Ⅰ, Avg.=203.19×10-6, n=55), 533.54×10-6~2536.51×10-6 (Sch-Ⅱ, Avg.=928.79×10-6, n= 30) to (117.21×10-6~4863.82×10-6 (Sch-Ⅲ, Avg.=1547.13×10-6, n=37). From Sch-Ⅰ to Sch-Ⅱ to Sch-Ⅲ, the LREE/HREE ratios decrease from 13.99~143.90 (Avg.=53.53), 22.38~70.08 (Avg.=33.74) to 7.44~69.86 (Avg.= 27.54). In Guilinzheng deposit, the high-Mo scheelite was formed in F-rich magmatic hydrothermal system with high oxygen fugacity, the alternative mechanism of REE entered into high-Mo scheelite is dominantly of Ca2++ Mo6+=REE3++(1-x) Mo5++xNb5+ (0≤x≤1). Decreasing Cl, increasing F concentrations and lowering f(O2) degree in ore-forming fluid evolution are favorable factors for high-Mo scheelite with enriching REE during its formation. After systematically comparative study from the JWB representative W- polymetallic deposits, it shows that the high-Mo scheelite have visible higher REE concentrations than those Mo-poor scheelite, REE resources in Guilinzheng the high-Mo scheelite ore has the prospect of comprehensive utilization in the future mining industry. ? 2022 Editorial Department of Mineral Deposits.
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