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REE CHARACTERISTICS AND ORE SOURCE STUDIES OF LONGBAOSHAN COMPLEX |
XIA Qing-lin1, CHEN Yong-qing2 |
1. China University of Geosciences, Wuhan 430074, China;
2. China Geological Survey, Beijing 100083, China |
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Abstract In Mesozoic, Longbaoshan intermediate-alkaline complex was formed as a result of two stages of magmatic intrusion. As shown by statistical analysis of REEin the complex, the total content of w ΣREEis nearly 2.5 times as high as the Clarke value, the ratio of w LREE/w HREEis nearly 9 times that of the crust, and light REEis greatly enriched, whereas Eu and Ce are slightly depleted. The REEdistribution patterns of various stages of intrusives and auriferous quartz veins are basically similar to each other, all dipping steeply towards the right. Nevertheless, ΣREEand LREEare richer in auriferous quartz veins than in magmatite. Combined with the geological and geochemical characteristics, the authors conclude that magma and metallogenetic materials of the complex were derived mainly from the same magma chamber in the upper mantle, and assimilated and mixed with the wall rocks during the intrusion of magma into the crust.
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Received: 01 March 2001
Published: 24 April 2002
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