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《GEOCHIMICA》 1997-01
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GEOCHEMISTRY AND ORIGIN OF THE BAERZHE REE Nb-Be-Zr SUPERLARGE DEPOSIT

Wang Yixian Zhao Zhenhua (Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640)  
The Baerzhe ore deposit in Jarud Qi,Nei Mongol Autonomous Region is a REE Nb Be Zr superlarge deposit.The ore bodies occur in the riebechite granites.The REE Nb Be Zr are mainly partitioned into xinanite,columbite,pyrochlore and zircon.The deposit is located in Huolinhe east west fault,which is between Da Hinggan Ling Linxi fault and Nen Jiang Balihan fault and gravity gradient belt of Da Hinggan Ling Taihang Shan Wu Ling Shan.Riebeckite granites emplaced in Jurassic volcanic basin of Da Hinggan Ling and its Rb Sr isochron age is 125 Ma.Ore bodies are intensively metasomatized by albitization and silicification.Riebeckite granites are the products of strong magmatic differentiation.They have V type REE patterns with intense Eu depletion,positive Ce anomalies and M tetrad effect.The contents of Rb and F are high in the granites whereas Sr and Ba are low.Ratios of K/Rb and Zr/Hf are low and Rb/Sr is high.On the basis of isotopic composition(ε Nd (T)=1.88—2.47, 87 Sr/ 86 Sr) i0.705,δ 18 O=5.2‰—6.0‰),we conclude that riebeckite hranites were derived fron the enriched mantle. Ore—forming mechanism is that magma formed by low degree or paartial melting of enriched mantle underwint strong differetiation with the presence of water and volatile leading to the formation of riebeckite granites.The granites were then repeatedly autometasomatized at late stage of magma,resulting in the formation of the superlarge deposit.
【CateGory Index】: P618.7
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