黑龙江黑河八直沟铜矿床成矿地质条件及矿床成因分析

Ore-forming geologic conditions and deposit genesis of Bazhigou Copper Deposit in Heihe,Heilongjiang

八直沟铜矿床位于黑龙江多宝山—黑河金铜多金属成矿带上,为了实现找矿突破,对八直沟铜矿床进行了成矿地质条件分析。分析表明:八直沟铜矿床受北东向嫩江—黑河断裂派生的北西向断裂控制,矿体赋存于早二叠纪正长花岗岩与上志留统—中泥盆统泥鳅河组地层大理岩及结晶灰岩内外接触带上,泥鳅河组地层是铜矿床形成的主要矿源层,早二叠纪花岗岩不仅提供热源,同时也是矿源之一。综合分析认为,八直沟铜矿床成因类型为矽卡岩型铜矿床。

Bazhigou Copper Deposit is located on Duobaoshan- Heihe gold and copper polymetallic metallogenic belt in Heilongjiang. To seek prospecting breakthrough,analysis has been carried out on the ore-forming geologic conditions in Bazhigou Copper Deposit. The results show that Bazhigou Copper Deposit is controlled by the NW-striking fault derived from NE-striking Nenjiang- Heihe fault. The new covered copper orebody occurs in the inner and outer contact zone of the Early Permian orthoclase granite and the marble and crystalline limestone in the strata from Upper Silurian- Middle Devonian Niqiuhe Formation. Strata from the Niqiuhe Formation are the main source strata for the formation of copper deposits. The Early Permian granite serves as one of the ore sources besides providing thermal sources. Comprehensive analysis thinks that Bazhigou Copper Deposit is a skarn type copper deposit.