The　magma　sources,　origins　and　precise　forming　ages　of　the　miarolite　from　Qishan　and　Kuiqi　intrusions　are　still　uncertain.　New　results　reveal　that,　miarolites　from　the　Qishan　and　Kuiqi　intrusions　yield　crystallization　ages　of　—101　and　∼98　Ma,　and　they　have　a　high　formation　temperature　(∼910°C)　and　low　oxygen　fugacity　value,　indicating　crystallization　condition　at　low　pressure　in　the　upper　crust　with　temperature　of　678°C.　The　Qishan　and　Kuiqi　miarolites　are　characterized　by　enrichment　in　SiO2　and　high-K　alkali,　depletion　in　Ca　and　Mg,　and　belong　to　the　high-K　weak　peraluminous　rock　series.　The　samples　are　enriched　in　HFSEs　(i.e.,　Ta,　Zr　and　Hf)　and　LILEs　(i.e.,　Ba,　P　and　Sr),　depleted　in　Ba　and　Sr　with　the　negative　anomaly　of　Eu.　In　the　primitive　mantle　normalized　trace　element　spider　diagram,　the　samples　show　a　right-inclined　‘seagull-type’　pattern,　combined　the　ratios　of　(La/Yb)N,　10000　×　Al/Ga,　Rb/Nb　and　Nb/Ta　etc.,　they　were　proved　to　be　alkaline　A-type　granite.　Combined　the　characterize　of　the　trace　elements,　they　were　derived　from　clay-rich　source　accompanied　pelite　melting,　and　subjected　to　K-feldspar　crystallization　fractional.　The　values　of　ɛHf(t)　and　tDM2　are　distributed　in　the　range　of　−2.8　to　3.3　with　∼1.2　Ga,　and　−6.0　to　4.0　with　∼1.2　Ga,　revealing　that　they　were　generated　from　the　Mesoproterozoic　Cathaysia　basement　rocks.　The　comprehensive　research　reveals　the　Kuiqi　and　Qishan　intrusions　derived　from　crust-mantle　mixing　and　partial　melting　of　the　crust,　respectively,　resulting　from　lithospheric　extension　generated　by　the　Paleo-Pacific　Plate　subducted　into　the　European-Asian　Plate.　©　2024　Geological　Society　of　China.