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《Geochimica》 1998-01
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RARE-EARTH ELEMENT MOBILITY DURING ORE-FORMING PROCESS OF DONGPING GOLD DEPOSIT

Bao Zhiwei; Zhao Zhenhua(Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640)  
Although the rare-earth elements are often considered to be relatively immobile,they are significantly mobile during hydrothermal alteration, metasomatism and chemical weathering. The investigation on the REE compositions of the source rocks,altered wall rocks, ores and the gangue minerals of Dengping gold deposit suggests that the REE are mobilized and differentiated during hydrothermal alteration. Because of the severe hydrothermal alteration, the altered wall rocks show positive Ce anomaly and higher LREE / HREE ratios comparing to unaltered rocks. The Chondrite-normalized REE patterns of the quartz vein-type gold ores are similar to those of the wall rocks;the gangue quartz and K-feldspar show relative lower LREE / HREE ratios. The most interesting phenomia is that the gangue quartz show significant positive Eu anomalies,while the secondary K-feldspars show less or no positive Eu anomalies. The data derived from this inveshgation and other workers' indicate that the REE are mobile during hydrothermal alteration in the ore-forming process of the Dongping gold deposit under conditions of mid-high temperature, mildly acidic to mildl basic,and high f_o. The REE fluoride complexes and REE fluorocarbonate complexes might be important during the rock-flind interaction, which results in the preferentialy HREE transporting into the fluid phase. Due to the oxidation of part of the Ce~(3+) to Ce~(4+) and Eu~(2+) to Eu~(3+) under high f_o, some of the Ce~(4+) precipitated, whereas Eu~(3+) retains in the fluid rather than into the secondary K-feldspar. Thus the altered wall rocks show HREE depleted patterns and the gangue quartz (hydrothermal fluid) shows HREE enriched patterns.
【Fund】: 国家科委攀登B资助!85-34-05A-03
【CateGory Index】: P595
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