Zijinshan　is　a　large　porphyry-epithermal　Cu-Au-Mo-Ag　ore　system　located　in　the　Zijinshan　mineral　field　(ZMF)　of　southwestern　Fujian　Province,　China.　Although　it　is　commonly　accepted　that　the　early　Cretaceous　magmatism　and　the　metallogenesis　of　the　mineral　field　are　closely　related,　the　tectonic　setting　for　the　ore-forming　event(s)　has　been　controversial　and　regarded　as　either　extensional　or　subduction-related.　New　U-Pb　zircon　geochronology,　Sr-Nd-Pb　isotopic　systematics,　and　geochemical　data　presented　here　from　granites　and　volcanic　rocks　in　the　mineral　field　help　to　clarify　this　uncertainty.　LA-MC-ICP-MS　U-Pb　zircon　analyses　yield　weighted　mean　ages　of　between　ca.　165　and　157　for　the　monzogranite,　ca.　112　Ma　for　granodiorite,　and　between　ca.　111　and　102　Ma　for　nine　samples　of　volcanic　units　in　the　study　area.　These　dates,　integrated　with　previous　geochronological　data,　indicate　that　there　were　two　magmatic　events　in　the　area　during　the　Middle　to　Late　Jurassic　and　the　Early　Cretaceous.　Major　and　trace　element　geochemistry　indicates　that　these　rocks　are　high-K,　calc-alkaline　granites,　are　enriched　in　LREE　and　Th,　U,　Ta,　Nd,　Sm　and　Yb,　and　depleted　in　Ba,　K,　Sr,　P,　Ti　and　Y.　These　features　are　characteristic　of　volcanic-arc　granites　or　active-continental　margin　granites.　The　Middle　to　Late　Jurassic　monzogranitic　plutons　in　the　region　have　initial　Sr-87/Sr-86　ratios　of　0.7096　to　0.7173,　epsilon　Nd-T　values　of　-10.1　to　-7.6,　Pb-206/Pb-204　isotope　ratios　of　18.51-18.86,　Pb-207/Pb-204　isotope　ratios　of　15.64-15.73,　and　Pb-208/Pb-204　isotope　ratios　of　38.76-39.18.　The　Early　Cretaceous　granodiorite　and　volcanic　rocks　are　distinctly　different　with　initial　Sr-87/Sr-86　ratios　of　0.7055-0.7116,　epsilon　Nd-T.　values　of　-8　to　0.5,　Pb-206/Pb-204　ratios　ranging　between　18.49　and　19.77,　Pb-207/Pb-204　ratios　of　15.63-15.71,　and　Pb-208/Pb-204　ratios　of　38.71-40.62.　These　characteristics　suggest　that　the　source　for　the　Middle　to　Late　Jurassic　monzogranitic　plutons　is　a　partially　melted　Mesoproterozoic　substrate,　with　a　minor　component　from　Paleozoic　material,　whereas　the　Early　Cretaceous　granodiorite　and　volcanic　rocks　may　represent　mixing　of　crustal　and　mantle-derived　melts.　It　is　therefore　suggested　that　the　Middle　to　Late　Jurassic　monzogranitic　plutons,　and　the　Early　Cretaceous　granodiorite　and　volcanic　rocks　in　the　ZMF　are　the　result　of　an　active　continental-margin　setting　related　to　the　subduction　of　the　Paleo-Pacific　Plate　beneath　the　Eurasian　continent.　Given　that　the　mineralization　and　the　early　Cretaceous　granodiorite　and　volcanic　rocks　in　the　area　are　genetically　related,　the　Zijinshan　porphyry-epithermal　ore　system　formed　in　the　subduction-related　tectonic　setting.　(C)　2013　Elsevier　B.V.　All　rights　reserved.