The　Mesozoic　magmatic　activities　of　the　Zijinshan　orefield　included　Late　Jurassic　and　Early　Cretaceous　Episodes.　The　first　episode　of　magmatic　activity　occurred　in　Late　Jurassic(154~149　Ma)in　a　compression　environment,　characterized　by　the　intrusion　of　Zijinshan　composite　granite　body　and　Caixi　pluton　of　S-type　granite.　The　Zijinshan　composite　granite　body　has　3　pulsations,　which　occurred　in　154　Ma,　150　Ma　and　149　Ma.　Caixi　pluton　intrusion　occurred　around　150　Ma.　The　magmatic　activity　of　the　second　episode　was　composed　of　four　stages　during　125~93　Ma　in　Early　Cretaceous　in　a　tension　and　mantle　upwelling　environment,　forming　a　series　of　I-type　granites　and　their　cogenetic　heterophase　volcanic　rocks　and　subvolcanic　rocks　and　providing　metallogenic　material　and　heat.　The　volcanic　eruption　and　super-hypabyssal　magmatic　intrusion　of　the　first　stage　finds　expression　in　the　formation　of　dacite　of　the　Lower　Member　in　Shimaoshan　Group　and　the　Zijinshan　subvolcanic　rocks　(125~118　Ma).　The　volcanic　eruption　and　intrusion　of　the　second　stage　are　characterized　by　the　andesite　eruption　of　Shimaoshan　Group　and　Sifang　pluton　intrusion　as　well　as　the　formation　of　dacite　porphyrite(109~103　Ma).　The　volcanic　eruption　and　intrusion　of　the　third　stage　are　characterized　by　the　dacite　eruption　as　well　as　the　porphyraceous　granodioritic　porphyry　intrusion　in　Luoboling-Zijinshan　together　with　the　formation　of　quartz　dioritic　porphyrite　near　Longjiangting　and　Ermiaogou(103~100　Ma).　The　volcanic　eruption　and　intrusion　of　the　fourth　stage　are　characterized　by　the　intrusion　of　Luoboling　prophyry,　the　eruption　of　rhyolite　in　the　upper　member　of　Shimaoshan　Group　and　the　intrusion　of　barren　vein　rocks　after　the　ore-forming　period　(e.g.,　Dayanli　granite　porphyry　dykes,　quartz　porphyry　dykes　in　Zijinshan　gold-copper　ore　deposit)(100~93　Ma).　The　Late　Jurassic　and　the　Early　Cretaceous　co-magmas　respectively　differentiated　and　evolved　into　varied　facies　in　different　areas.