Comparative Studies of Rare Earth Elements for Early Cretaceous Volcanic Rocks along Southern Segment of Zhangbaling Uplift Belt
来源期刊：Journal of Rare Earths2006年第S2期
论文作者：牛漫兰
文章页码：347 - 352
摘 要：Early cretaceous volcanic rocks in the southern segment of the Zhangbaling uplift belt and those along the eastern part of the north Dabie Mountains, the Luzong basin, the western Shandong Province all belong to the same tectonic setting of lithospheric extension and thinning in eastern China. However, characteristics of rare earth elements show that volcanic rocks in the southern segment of the Zhangbaling Uplift belt originated from the crust-mantle transition zone, those in the eastern part of the north Dabie Mountains were related to crustal material contamination during magma ascending, the magma of the volcanic rocks in the Luzong basin were derived from the partial melting of the enriched mantle related to subducted oceanic-crust minerals, the magma of the volcanic rocks in western Shangdong Province came from the partial melting of the enriched mantle affected by contamination and metasomatism of the subducted continental-crust. Therefore, the research results of the rare earth elements coincide with the studies of tectonic setting, incompatible element and Sr, Nd isotope. It is further indicated that the rare earth elements offer effective approach to tracing the material sources of volcanic rocks. The different origin of magma and effect of the Tan-Lu fault zone should be an important reason for association with Au-mineralization in the Zhangbaling Uplift belt.
牛漫兰
摘 要：Early cretaceous volcanic rocks in the southern segment of the Zhangbaling uplift belt and those along the eastern part of the north Dabie Mountains, the Luzong basin, the western Shandong Province all belong to the same tectonic setting of lithospheric extension and thinning in eastern China. However, characteristics of rare earth elements show that volcanic rocks in the southern segment of the Zhangbaling Uplift belt originated from the crust-mantle transition zone, those in the eastern part of the north Dabie Mountains were related to crustal material contamination during magma ascending, the magma of the volcanic rocks in the Luzong basin were derived from the partial melting of the enriched mantle related to subducted oceanic-crust minerals, the magma of the volcanic rocks in western Shangdong Province came from the partial melting of the enriched mantle affected by contamination and metasomatism of the subducted continental-crust. Therefore, the research results of the rare earth elements coincide with the studies of tectonic setting, incompatible element and Sr, Nd isotope. It is further indicated that the rare earth elements offer effective approach to tracing the material sources of volcanic rocks. The different origin of magma and effect of the Tan-Lu fault zone should be an important reason for association with Au-mineralization in the Zhangbaling Uplift belt.
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