• journal_title：The Canadian Mineralogist
• Contributor：Ru Cheng Wang ; François Fontan ; Xiao Ming Chen ; Huan Hu ; Chang Shi Liu ; Shi Jin Xu ; Philippe de Parseval
• Publisher：Mineralogical Association of Canada
• Date：2003-
• Format：text/html
• Language：en
• Identifier：10.2113/gscanmin.41.3.727
• journal_abbrev：Can Mineral
• issn：0008-4476
• volume：41
• issue：3
• firstpage：727
• section：Articles

The Xihuashan granitic complex (southern China) is mainly composed of coarse-grained porphyritic biotite granite (G–a), medium-grained porphyritic biotite granite (G–b), and medium- to fine-grained porphyritic biotite granite (G–c). The G–a granite is characterized by monazite-(Ce) and xenotime-(Y), in addition to commonly observed zircon and uranoan thorite. In the G–b and G–c intrusive units, monazite-(Ce) becomes very scarce, whereas Y-bearing minerals, including Y-bearing spessartine, xenotime-(Y), gadolinite-(Y), fergusonite-(Y), and yttrian fluorite (up to 15 wt% Y₂O₃), are concentrated to various extents. Spessartine exhibits chemical zoning, which is displayed, in the core, by elevated contents of Y and heavy REE (HREE) (up to 2.32 wt% Y₂O₃ and 1.51% HREE₂O₃) and micrometric inclusions of Y-bearing minerals. Similarly, zircon from the G–b and G–c granites contains polymineralic micro-inclusions in the core. Overall, the accessory minerals point to a magmatic environment of crystallization for the G–a granite. In contrast, the crystallization of the G–b and G–c granites involved magmatic and hydrothermal stages. The late- to postmagmatic fluid is enriched in F and CO₂, and appeared as a result of the final oversaturation of the granitic melt in a fluid phase.