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Petrogenesis of the Late Paleozoic Diorites-Granitoids in Fengshan Area,Northern Hebei Province: Constraints from Petrochemistry,Zircon U-Pb Chronology and Hf Isotope

FENG Yonggang~1,LIU Shuwen~(1,),Lü Yongjun~1,TIAN Wei~1,LIU Xiaoming~21.The Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,School of Earth and Space Sciences,Peking University,Beijing 100871;2.State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069;  
The late Paleozoic diorites-granitoids emplaced into Precambrian lithological assembleges in Fengshan area,Northern Hebei province are characterized by enrichment in sodium(Na_2O/K_2O1.0),high Sr,low Y and HREE contents,and their Sr/Y values change from 37.15 to 151.22.Most samples also show positive Eu anomalies and their Eu~* ranges from 0.92 to 1.53.LA-ICP-MS zircon dating and zircon Hf isotope analyses for samples diorite(sample JB6024) and monzogranite(sample JB6037-1) reveal that the diorite and the monzogranite were produced at 315±2.8?Ma and 306.6±6?Ma,respectively,namely,indicated the two late Paleozoic magmatic episodes in the Fengshan area.Whole rock petrochemistry,Sr-Nd isotopes and zircon Hf isotope indicate that the late Paleozoic Fengshan diorite was produced by the magmatic mixing between mafic magma derived from an EMI-type enriched mantle and felsic magma derived from partial melting of the ancient lower crust,and the granitoids derived from fractional crystallization of the dioritic magma that was obviously contaminated by upper crustal materials during their emplacement.
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