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Genesis and Significance of Dark Dikes in the Jinchanggouliang Mine Area,Inner Mongolia:Evidences from Geochemistry of the Major and Trace Elements

CHEN Jun-qiang~1,SUN Jing-gui~(1,2),PIAO Shou-cheng~3,ZHAO Jun-kang~3,ZHAI Yu-feng~4(1.College of Earth Sciences,Jilin University,Changchun 130061,China;2.The State Major Laboratory of Endogenic Metallic Depo-(sit) Mineralization Mechanism Research,Nanjing University,Nanjing 210093,China;3.College of GeoExploration Science and Technology,Jilin University,Changchun130026,China;4.Jintao Stock Limited Company,Chifeng024327,China)  
The dark dikes associated with mineralization in the Jinchanggouliang mine area,are mostly fine diorite-quartz diorites and diorite porphyrite-dacite porphyries.The ALK of the fine diorite-quartz diorites is 5.47%~5.88%,ratio of K_2O/Na_2O is 0.455~0.496.Therefore,it belongs to calc-alkalic rock series and shows the characters of Ⅱ-type Adakite;The ALK of dioritic porphyrite-dacite porphyries is 7.83%~8.28%,ratio of K_2O/Na_2O is 1.100~1.747,belonging to shoshonitic rock series.The characteristics of elements shows that magma of fine diorite-quartz diorites derived from the enriched mantle or lower crust undergone ocean crust subducting and dehydrating,and was formed and emplaced in the process of crust growth.The magma of dioritic porphyrite-dacitic porphyries emplaced relatively late,it might derive from upper crust or undergo intensive contamination of crustal materials,and was formed in the proces of crust thining.These characteristics suggest that the geodynamics background of the Jinchanggouliang gold deposit formation is the transition process from compression to extension.
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