Deep xenoliths in alkalic porphyry, Liuhe, Yunnan, and implications to petrogenesis of alkalic porphyry and associated mineralizations

Na-rich microlite-glass is first discovered in deep-source xenoliths in alk ali-rich polphyry, Liuhe village, Heqing County, Yunnan Province. It is sho wn that the ultramafic xenoliths originated from partial melting of primary mantle and the glass resulted from metasomatism between the xenoliths and mantle fluid derived from mantle degassing. Mantle metasomatism not only re sulted in the enrichment of alkaline, large-ion elements, ore metals and vo latiles but also created a favorable condition for the generation of alkali ne magmas. The mantle xenoliths and their characteristics of mantle metasom atism provide important evidence for a better understanding of the petrogen esis and mineralization of the Cenozoic alkali-rich porphyry in western Yun nan.