地球物理测量在广西罗维多金属矿勘查的应用效果
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摘要
广西罗维多金属矿区出露地层为寒武系小内冲组和黄洞口组,分布多处土壤Ag、Pb、Zn、W、Bi异常,异常具Pb-Ag-Zn、Bi-W、Zn-Bi-W-Pb等组合特征。区内砂泥岩和铅锌矿石样品的磁性无明显差别。经高精度磁测圈出异常3个,反演估算异常磁源体顶面埋深23~43 m或更深;利用EH4大地电磁测深对高磁异常进行查证,以反演电阻率断面图确定低阻和中低阻区的空间分布。经综合"地、化、物"资料后进行钻探工程验证,发现多个银铅锌钨铋多金属矿体,找矿效果甚佳。
The outcropped strata in the Luowei deposit area,Guangxi are sandstone and mudstones of Xiaoneichong and Huangdongkou formation of Middle to Upper Cambian system. Soil geochemical anormalies of Ag,Pb,Zn,W and Bi are widely distributed,these anormaliesare characterized with Pb- Ag- Zn,Bi- W and Zn- Bi- W- Pb assoications. There are no apparent magnetic anomaly difference between mudstone,sandstone and Pb- Zn ore. Three magnetic anormalies have been outlined in the area by appying high precision MT survey,and the upper surface of magnetic- source of these anormalies are 23 to 43 meters deep or deeper below the surface based on inverse calculation. The MT anomalies were checked by EH4 Audio- frequency MT,the spatial distributions of anomalies of low to low- middle resistivities were determined by inversed cross- section diagraph. The test drilling test on these anormalies has found more Ag- Pb- Zn- W- Bi polymetallic orebodies,thus has achieved effective prospecting results.
The outcropped strata in the Luowei deposit area,Guangxi are sandstone and mudstones of Xiaoneichong and Huangdongkou formation of Middle to Upper Cambian system. Soil geochemical anormalies of Ag,Pb,Zn,W and Bi are widely distributed,these anormaliesare characterized with Pb- Ag- Zn,Bi- W and Zn- Bi- W- Pb assoications. There are no apparent magnetic anomaly difference between mudstone,sandstone and Pb- Zn ore. Three magnetic anormalies have been outlined in the area by appying high precision MT survey,and the upper surface of magnetic- source of these anormalies are 23 to 43 meters deep or deeper below the surface based on inverse calculation. The MT anomalies were checked by EH4 Audio- frequency MT,the spatial distributions of anomalies of low to low- middle resistivities were determined by inversed cross- section diagraph. The test drilling test on these anormalies has found more Ag- Pb- Zn- W- Bi polymetallic orebodies,thus has achieved effective prospecting results.
引文
[1]广西地质局437地质队.广西扶绥县新隆乡渌井矿区铅锌矿勘探报告[R].1960.
[2]广西冶金地质勘探公司274地质队.广西扶绥县新隆乡渌井矿区深部及外围铅锌矿普查地质报告[R].1989.
[3]广西第四地质队.广西隆安县凤凰山矿区15—36线地段银矿勘探报告[R].1995.
[4]广西第四地质队.广西隆安县凤凰山银矿区姆驮山矿段银矿普查报告[R].2004.
[5]崔彬,翟裕生,蒙义峰,等.广西大瑶山—西大明山金银成矿系统研究[J].地球科学—中国地质大学学报,2000,25(4):352–396.
[6]梁水养,杨勋.西大明山隆起区银铅锌地球化学特征及找矿潜力浅析[J].南方国土资源,2004,(4):22–24.
[7]黄继钧.广西凤凰山银矿区构造特征及构造应力场、应变场分析[J].地质力学学报,2001,7(1):9–20.
[8]广西地方志编纂委员会.广西通志!地质矿产志[M].南宁:广西人民出版社,1992.
[9]Dekkers M J.Magnetic properties of natural pyrrhotite Part I:behaviors of initial susceptibility and saturation magnetization related rock magnetic parameters in a grain-size dependent framework[J].Phys.Earth Planet.Inter,1988,(52):376-393.
[10]Dunlop D,Ozdemir O.Rock Magnetism:Fundamentals and Frontiers[M].Cambridge University Press,1997.
[2]广西冶金地质勘探公司274地质队.广西扶绥县新隆乡渌井矿区深部及外围铅锌矿普查地质报告[R].1989.
[3]广西第四地质队.广西隆安县凤凰山矿区15—36线地段银矿勘探报告[R].1995.
[4]广西第四地质队.广西隆安县凤凰山银矿区姆驮山矿段银矿普查报告[R].2004.
[5]崔彬,翟裕生,蒙义峰,等.广西大瑶山—西大明山金银成矿系统研究[J].地球科学—中国地质大学学报,2000,25(4):352–396.
[6]梁水养,杨勋.西大明山隆起区银铅锌地球化学特征及找矿潜力浅析[J].南方国土资源,2004,(4):22–24.
[7]黄继钧.广西凤凰山银矿区构造特征及构造应力场、应变场分析[J].地质力学学报,2001,7(1):9–20.
[8]广西地方志编纂委员会.广西通志!地质矿产志[M].南宁:广西人民出版社,1992.
[9]Dekkers M J.Magnetic properties of natural pyrrhotite Part I:behaviors of initial susceptibility and saturation magnetization related rock magnetic parameters in a grain-size dependent framework[J].Phys.Earth Planet.Inter,1988,(52):376-393.
[10]Dunlop D,Ozdemir O.Rock Magnetism:Fundamentals and Frontiers[M].Cambridge University Press,1997.