This　study　presents　zircon　U-Pb　geochronology　and　Hf　and　O　isotope　data　for　granitic　rocks　in　the　Zijinshan　ore　field,　southwestern　Fujian　Province,　China.　The　intrusive　rocks　comprise　monzogranite,　granite　and　granodiorite.　The　magmatic　zircon　U-Pb　ages　from　these　granitic　rocks　can　be　divided　into　four　episodes:　episodes　1　(157.9-159.9　Ma)　and　2　(141　Ma)　in　the　Late　Jurassic　and　episodes　3　(108.1-103.2　Ma)　and　4　(97.5-99.7　Ma)　in　the　Middle　and　Late　Cretaceous,　respectively.　Patterns　of　rare-earth　elements　(REE)　show　enrichment　in　light　REE　and　obvious　negative　Eu　anomalies.　These　rocks　are　also　enriched　in　Rb,　Th,　U,　La,　Ce,　Nd　and　Hf,　and　depleted　in　Ba,　Nb,　Sr,　P　and　Ti.　The　increasing　La/Yb　ratio　and　decreasing　heavy　REE　content　with　decreasing　age　may　imply　an　increasing　contribution　of　mantle-derived　materials　from　the　Late　Jurassic　to　Cretaceous.　The　zircon　epsilon　(Hf)(t)　and　delta　O-18　values,　ranging　from　-37.7　to　-2.8　and　12.0　parts　per　thousand　to　6.3　parts　per　thousand,　respectively,　indicate　that　the　lower　crust　is　an　important　source　of　granitic　rocks.　There　was　a　significant　increase　in　epsilon　(Hf)(t)　values　and　a　decrease　in　delta　O-18　values　in　the　younger　magmatic　episodes　(3　and　4),　which　ranged　from　-11.4　to　-0.6　and　10.7　to　6.3　parts　per　thousand,　respectively.　This　suggests　an　increasing　contribution　of　mantle-derived　magma　to　the　crustal　melts　from　the　Late　Jurassic　to　late　Early　Cretaceous　in　response　to　the　changing　regional　tectonic　setting　from　compression　to　extension　and　an　increasing　interaction　between　the　crust　and　mantle.