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《Journal of Jiling University (Earth Science Edition)》 2004-04
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Geochemical characteristics of Qinglongcun Group in Wolong area, Yanbian

QIU Dian-ming, ZHANG Xing-zhou,ZHANG Chun-yan(College of Earth Sciences, Jilin University, Changchun130061, China)  
The Qinglongcun Group is located at the eastern part of the north of North China Plate. It consists mainly of schist, gneiss and amphibolite. The group underwent the degraded metamorphism from amphibolite to greenschist facies. Its parental rocks belong to an assemblage of calc-alkaline andesite and rhyolite. Geochemical characteristics of the group indicate an island arc setting. The magma of same derivation experienced differentiation of basaltic magma in island arc, and this basaltic magma was formed by moderate degree of partial melting of the enriched MORB. That Ti depletion related to Zr and Y is probably linked with the depth of subduction of the island arc. The result shows that the Qinglongcun Group can not be correlated to the surrounding groups and may represent subduction of the Paleo-Asian Ocean underneath the northern margin of the North China Plate.
【Fund】: 国家教育部博士点科学基金项目(200001870)
【CateGory Index】: P593
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