关键词: 金厂沟梁, 暗色脉岩, 元素地球化学, 地球动力学

Abstract: 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 K₂O/Na₂O 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 K₂O/Na₂O 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.

Key words: Jinchanggouliang, dark dikes, element geochemistry, geodynamics