甘肃省肃北县同昌口东铁铜多金属矿地质特征探讨
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摘要
勘查区位于北山的北部,地层区划属天山-兴安地层区北山地层分区双鹰山地层小区和马鬃山地层小区,空间位置位于牛圈子-洗肠井多金属成矿带的的弧后盆地。矿区主要出露地层为长城系、志留系中上统公婆泉群,志留系中上统公婆泉群蚀变安山岩普遍遭受强烈的青盘岩化,是同昌口东铁铜矿的主要含矿层位。铁矿体长80～220 m,平均水平厚度1.18～3.24 m,最大控制沿深280 m,铁平均品位TFe28.92%,产状40°∠70°、145°～170~( o)∠52°～70~( o)。矿体赋存于蚀变安山岩内,含矿岩石为碎裂状硅化安山岩,矿体呈透镜状。铜矿体长120～520 m,平均水平厚4.33～6.35 m,铜平均品位0.67%,产状125°～170°∠52°～80°。同昌口东铁铜矿属火山岩型。
The exploration area is located in the northern part of Beishan. The stratigraphic division belongs to the Shuangying Mountain and Mazuoshan Stratigraphic Zones in the Beishan-Xingan Stratigraphic Zone of Tianshan-Xingan Stratigraphic Zone, and the spatial location is in the back-arc basin of Niuquanzi-Xichangjing polymetallic metallogenic belt. The main outcropping strata in the mining area are the Great Wall System and the Gongpoquan Group of the Upper Silurian System. The altered andesite of the Gongpoquan Group of the Upper Silurian System is generally subjected to intense bronzization, and is the main ore-bearing horizon of the Tongchangkou East Iron-Copper Deposit.The length of the ore body is 80～220 m, the average horizontal thickness is 1.18～3.24 m, the maximum control is 280 m along the depth, the average grade of iron is 28.92%, and the occurrence is 40°∠70°and 145°～ 170°∠ 52°∠70°. The orebody is hosted in altered andesite, the ore bearing rock is fragmented silicified andesite and the ore body is lenticular.The copper ore body is 120 m to 520 m long, with an average horizontal thickness of 4.33 m to 6.35 m, average copper grade of 0.67%, occurrence of 125 to 170 degrees 52 to 80 degrees. The Tongchangkou east iron copper deposit belongs to volcanic rock type.
The exploration area is located in the northern part of Beishan. The stratigraphic division belongs to the Shuangying Mountain and Mazuoshan Stratigraphic Zones in the Beishan-Xingan Stratigraphic Zone of Tianshan-Xingan Stratigraphic Zone, and the spatial location is in the back-arc basin of Niuquanzi-Xichangjing polymetallic metallogenic belt. The main outcropping strata in the mining area are the Great Wall System and the Gongpoquan Group of the Upper Silurian System. The altered andesite of the Gongpoquan Group of the Upper Silurian System is generally subjected to intense bronzization, and is the main ore-bearing horizon of the Tongchangkou East Iron-Copper Deposit.The length of the ore body is 80～220 m, the average horizontal thickness is 1.18～3.24 m, the maximum control is 280 m along the depth, the average grade of iron is 28.92%, and the occurrence is 40°∠70°and 145°～ 170°∠ 52°∠70°. The orebody is hosted in altered andesite, the ore bearing rock is fragmented silicified andesite and the ore body is lenticular.The copper ore body is 120 m to 520 m long, with an average horizontal thickness of 4.33 m to 6.35 m, average copper grade of 0.67%, occurrence of 125 to 170 degrees 52 to 80 degrees. The Tongchangkou east iron copper deposit belongs to volcanic rock type.
引文
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[4] 王锦涛,胡万长.甘肃省肃北县同昌口东铁铜多金属矿普查报告[R].甘肃:兰州矿产勘查院,2016.
[2] 殷先明.甘肃北山斑岩型铜矿找矿研究[J].甘肃地质学报,2003(03):1-5//17.
[3] 杨建国,闫晔轶.北山地区斑岩铜(钼金)矿成矿规律与找矿方向[J].矿床地质,2010(S1):313-314.
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