《Table 2 Comparison of the composition of rhyolites in this study and some other A-type rhyolites/gr

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《"Geochemistry,petrogenesis and tectonic implication of Early Cretaceous A-type rhyolites in Hailar Basin,NE China"》

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According to data in Table 1，the Early Cretaceous rhyolites in research area have total REE abundances（ΣREE）of（176.4-347.6）×10-6，obviously lower than granitoids formed in continental rifting and breakup，such as Brandberg and Paresis complex in the Damaraland of west-central Namibia（Schmitt et al.，2000；Trumbull et al.，2004）and Corsica peralkaline granites in France（Poitrasson et al.，1995），but similar to that of post-collisional granitoids，such as alkaline granitoids from the Djebel Drissa ring complex of Algeria（Kahoui&Mahdjoub，2004），and Baicha and Yaokeng granites in eastern China（Wang，2009；Xiao et al.，2007）.The main characteristics of the samples show LREEs enrichment and HREEs depletion with（La/Yb）Nratios of 6.63--17.56.The fractionations of LREEs are higher than HREEs with（La/Sm）Nratios of 3.33-4.94 and（Gd/Yb）Nratios of 1.50-2.36.Significant negative Eu anomalies withδEu=0.09-0.58 suggest that samples underwent intense fractional crystallization of plagioclase.Chondrite-normalized REE diagram shows uniform REE pattern and is similar to that of the other coeval A-type rhyolites in the Hailar Basin，Baicha and Yaokeng A-type granites，and the Djebel Drissa ring complex of Algeria（Fig.3a；Table 2）.