Zircon Hf-O Isotopes of the Gangdese Porphyry Cu Deposits:Implication for Generation of Porphyry Cu Deposits in Collisional Orogenic Setting

1 Introduction Porphyry Cu deposits mostly occur in island-arc and continental arc settings worldwide in association with subduction-related calc-alkaline intermediate-felsic magmas(Richards,2003;Cooke et al,2005;Sillitoe,2010).Recent studies have documented that such deposits also occur in post-subduction setting,such as Miocene1 Introduction Porphyry Cu deposits mostly occur in island-arc and continental arc settings worldwide in association with subduction-related calc-alkaline intermediate-felsic magmas(Richards,2003;Cooke et al,2005;Sillitoe,2010).Recent studies have documented that such deposits also occur in post-subduction setting,such as Miocene中国地质调查局、国际矿床成因协会2Vol.8