GEOLOGICAL CHARACTERISTICS AND METALLOGENIC MODEL OF BUDUNHUA COPPER DEPOSIT IN THE MIDDLE-SOUTH SECTION OF DAXINGANLING MOUNTAINS

A mount of copper deposits, with mainly hydrothermal vein type and porphyry type, are found in the middlesouth section of Daxinganling Mountains. Among them, the Budunhua copper deposit attracts particular attention because it owns both of the mineralization types in one deposit. However, the reason for the different metallogenic characteristics has not been well explained. Based on a summarization of previous researches, this paper concludes that the mineralization state of the deposit is probably related to the differences of tectonic evolution between the two ore blocks (Jinjiling and Kongqueshan) during the Late Jurassic metallogenic stages. Due to the vertical displacement of geological bodies on both sides of the Budunhua compressional belt, the Kongqueshan ore block on the hanging wall was raised up relatively and formed copper deposit of epithermal vein type. In the period of (165±2) to (151.95±0.73) Ma, it is possible that biotite granodiorite existed in the deep of Jinjiling ore block on the foot wall and formed disseminated copper mineralization in the inner or outer contact belt of the intrusive rock, which could be a prospecting direction for this ore block. Finally, the ore-forming model of Budunhua deposit is established for the research of the polymetallic metallogenic regularity in middle-southern Daxinganling Mountains.