Abstract
The Xihuashan granitic complex is characterized by enrichment in rare-earth elements (REE). In particular, the second-stage granite (G-b) is markedly enriched in yttrium, and therefore contains complex associations of Y-bearing minerals. In this granite, garnet displays specific yttrium zoning with an Y-rich core and a “clean” rim. Besides minute inclusions of Y-bearing minerals, garnet involves a striking amount of Y and HREE in its central area. It is suggested that enrichment in Y in the garnet core accords with that in the melt as a result of REE magmatic fractionation. However, the “clean” rim may be the direct result of accumulation of fluid phases in the magma, which is virtually unfavorable for the entrance of REE in the garnet structure.
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Wang, R., Hu, H., Zhang, A. et al. Yttrium zoning in garnet from the Xihuashan granitic complex and its petrological implications. Chin. Sci. Bull. 48, 1611–1615 (2003). https://doi.org/10.1007/BF03183970
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DOI: https://doi.org/10.1007/BF03183970