科研之友
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摘要
Rhenium ( Re) as one of the significant critical metals and essential for national security and military strategies.It has attracted extensive attention in recent years.At present, 90% of Re resources was produced in porphyry deposits in the world.Re is mainly enriched in molybdenite, due to the similar element properties of Re and Mo (molybdenum).However, the nanoscale occurrence and enrichment mechanisms of Re in molybdenite is still need to be further studied.This work focuses on the molybdenite in the newly discovered Zhanling porphyry molybdenum deposit in the Jiangnan uplift belt.The molybdenite is the main rhenium-bearing mineral with two types, such as coarse-grained leaf-shaped molybdenite (Type- I ) and fine-grained aggregate molybdenite (Type-II ) which is slightly later.LA-ICP-MS trace element analysis results showed that the Re average contents in the Type- II (89.4 x 10"°) is significantly higher than that Type- I (50.0 x 10 6 ) , but the Re shows obvious irregular enrichment in the individual grain of Type- I .Generally, the contents of Re is higher in the core (89.4 x 10 6 ) , but lower in the edge (37.6 x 10 6).Through TEM observation on the Re-rich regions in the Type- II , two different characteristics of molybdenite has been recognized in the ADF-TEM photos.The characterization a of molybdenite has a relatively high Re contents.Besides isomorphic substitution in the lattice of molybdenite, Re atoms also occur as Re-S adsorption form exist in molybdenite.While the characterization b of molybdenite shows a relatively lower Re contents and Re mainly exists in the form of isomorphic substitution.Therefore, we emphasize that most of Re substituted Mo in the molybdenite crystal lattice, and few Re can be adsorbed on the surface of the molybdenite crystal as the Re-S form, which resulting the Re microheterogeneity in molybdenite.
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