西藏拉青东矿区矽卡岩型铜多金属矿床特征及找矿意义OA

The Laqingdong mining area is located in the eastern part of the Laqing River,Jiaqiong Town,Bange County,Xizang.In recent years,a newly discovered skarn type copper polymetallic deposit has been identified,delineating two copper ore bodies and one magnetite ore body.The copper ore bodies extend 170 m along strike and 27～93 m along dip,with an average thickness of 2.57～5.12 m and an average Cu grade of 1.68%～1.88%.The magnetite ore body extends 200 m along strike and 122 m along dip,with an average thickness of 7.8 m,an average TFe grade of 45.31%,and an associated Cu grade of 0.36%.This study systematically analyzes the metallogenic geological background,geological characteristics,ore body characteristics,induced polarization anomaly characteristics,and deposit genesis of the deposit.The results show that the deposit is a skarn type deposit,with ore body morphology controlled by secondary faults derived from the Ritu-Gaize-Dingqing fault.The magnetite ore body formed in the late skarn stage,while the copper ore body formed in the quartz-sulfide stage.During the supergene stage,magnetite was oxidized into limonite and hematite,and copper sulfides were oxidized into malachite.The presence of surface skarn,copper-iron mineralization,and alteration minerals such as chlorite and epidote serves as a direct indicator for prospecting skarn type ore bodies.Low-resistivity,medium-to-high-polarization induced polarization anomalies within skarn distribution areas are important indicators for locating concealed skarn type ore bodies.This study provides theoretical support and prospecting criteria for understanding the metallogenic mechanism and expanding the scale of the deposit in the study area,accumulates experience for exploring similar types of deposits in the region,and offers important foundational data for comprehensive metallogenic research in the Laqing area.