The　Cretaceous　igneous　rocks　experienced　a　strong　crust-mantle　interaction　and　widely　developed　along　the　coast　of　Fujian　Province,　but　the　details　of　this　tectonic-magmatic　event　are　still　controversial.　We　report　detailed　petrography,　geochronology,　and　geochemistry　of　the　Changanshan　diorite　and　rhyolite　in　Fuzhou　University,　which　provided　new　evidence　for　the　correlation　between　crust-mantle　interaction.　Zircon　U-Pb　geochronology　of　diorites　and　rhyolites　yield　ages　of　107.　2　+/-　0.　3Ma　and　ca　98.　6Ma,　respectively.　It　indicated　that　they　were　formed　in　the　late　Early　Cretaceous　to　early　Late　Cretaceous.　The　zircon　epsilon(Hf)　(t)　values　in　the　diorites　and　rhyolites　are　-2.　1　similar　to　+　0.　5　and　-2.　7　similar　to　+　1.　1　,　respectively.　The　rhyolites　are　characterized　by　rich　silicon　and　alkali,　poor　calcium　and　magnesium,　high　fractionation　indexes,　and　thus　belonging　to　weakly　peraluminous　rocks.　The　rhyolites　samples　show　prominent　pattern　of　relative　enrichment　in　LREE,　and　strong　negative　Eu　anomalies,　similar　chemically　to　typical　A-type　rhyolite.　The　magma　source　of　the　rhyolites　was　likely　produced　by　interaction　of　asthenosphere　melts　with　subduction-influenced　enriched　mantle　wedge,　and　experienced　fractional　crystallization　in　the　crust.　The　petrogenesis　of　diorite　may　be　the　mixing　of　water　rich　mantle　magma　and　felsic　crust　magma　produced　by　mantle　magma　underplating.　In　combination　with　the　regional　tectonic　setting,　these　rocks　were　probablely　formed　in　continental　arc　setting　related　to　the　subduction　of　oceanic　crust.