黔西南层控卡林型金矿床电性结构特征——水银洞剖面音频大地电磁测深研究
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摘要
水银洞金矿作为黔西南层控卡林型金矿重要组成部分,矿体赋存于倾角较缓的不纯碳酸盐岩中,主要矿体以层状、似层状受控于主体褶皱灰家堡宽缓背斜两侧500 m附近。笔者在水银洞金矿343线已知矿体上开展了音频大地电磁法试验研究,重点对深部电性结构、背斜褶皱形态及不整合界面型金矿异常进行研究,结合物性特征,对实测的数据进行反演计算,得出由浅到深总体表现为"高阻-低阻-高阻"的分层电性特征,矿体、蚀变体的视电阻率值也集中表现为相对低值异常。在此基础上,对灰家堡背斜东部优选靶区(400勘探线)开展音频大地电磁法测深工作,获得了该区浅地表至二叠系中统茅口组电性结构特征,推测灰家堡背斜轴面向东倾没至"纳马寨"一带;最后,茅口组与龙潭组之间存在一稳定的横向中低阻条带状起伏界面异常,体现了背斜核部的强硅化砾状粘土岩型矿体和围岩之间的过渡特征。
Shuiyindong gold deposit is an important part of Karlin- type gold deposits in southwest Guizhou,the orebody occurs in impure carbonate rock of low angle,the main orebody is controlled by the two sides of Huijiaobao anticline 500 m nearby as stratiform and stratoid. Audio mangnetotelluric sounding experience was studied in the known orebody of line 343 in Shuiyindong gold deposit,especially the deep electrical structure,anticline fold shape and unconformity interface gold anomaly. With the physical features,the tested data were back calculated and showed the layer electrical feature of‘high resistance- low resistance- high resistance'from shallow to deep,the apparent resistivity of orebody and altered rock showed low anomaly. On the basis,Audio mangnetotelluric sounding was studied in the precedence target area of east Huijiabao anticline,the electrical structure features are known from shallow plane to Maokou formation,middle Dyas of this area,it was supposed the axial surface of Huijiabao anticline leaned east to Namazhai area. Finally,a stable lateral middle- low resistance stripped irregular plane anomaly existed between Maokou formation and Longtan formation,it showed the transverse features of strong sllicified clay rock and wall rock of anticline core.
Shuiyindong gold deposit is an important part of Karlin- type gold deposits in southwest Guizhou,the orebody occurs in impure carbonate rock of low angle,the main orebody is controlled by the two sides of Huijiaobao anticline 500 m nearby as stratiform and stratoid. Audio mangnetotelluric sounding experience was studied in the known orebody of line 343 in Shuiyindong gold deposit,especially the deep electrical structure,anticline fold shape and unconformity interface gold anomaly. With the physical features,the tested data were back calculated and showed the layer electrical feature of‘high resistance- low resistance- high resistance'from shallow to deep,the apparent resistivity of orebody and altered rock showed low anomaly. On the basis,Audio mangnetotelluric sounding was studied in the precedence target area of east Huijiabao anticline,the electrical structure features are known from shallow plane to Maokou formation,middle Dyas of this area,it was supposed the axial surface of Huijiabao anticline leaned east to Namazhai area. Finally,a stable lateral middle- low resistance stripped irregular plane anomaly existed between Maokou formation and Longtan formation,it showed the transverse features of strong sllicified clay rock and wall rock of anticline core.
引文
[1]欧阳玉飞,刘继顺,周余国,刘卫明,高启芝.卡林型金矿研究的若干问题探讨[J].地质调查与研究,2009,32(2):138
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[5]NIE Aiguo,MEI Shiquan,GUAN Daiyun,WU Pan,ZHUANG Zhuru.A study on the genetic relations between Permian Longtan Formation coal series strata and Carlin-type gold deposits,southwestern Guizhou Province,China[J].Chin.J.Geochem,2008,27:291-298.
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[7]刘建中,邓一明,刘川勤.贵州省贞丰县水银洞层控特大型金矿成矿条件与成矿模式.中国地质,2006,33(1):169-177.
[8]周余国,刘继顺,王作华,欧阳玉飞,高启芝,刘德利,黄元有.从滇黔桂“金三角”区域地层地球化学演化特征探讨卡林型金矿的物质来源[J].地学前缘,2009,16(2):199-208.
[9]王泽鹏,夏勇,宋谢炎,游彬,邓新华,汪小勇.黔西南卡林型金矿成矿物质深部来源:来自同位素和稀土元素证据[J].矿床地质,2010,增刊(29):519-520.
[10]陈懋弘.滇黔桂卡林型金矿的构造型式和构造背景[J].矿物学报,2011,(增刊):192-193.
[11]郑禄林.黔西南卡林型金矿研究现状及展望[J].矿产与地质,2015,29(1):59-64.
[12]刘建中,夏勇,邓一明.贵州水银洞超大型金矿床金的赋存状态再研究[J].贵州地质,2007,24(3):165-169.
[13]王成辉,王登红,刘建中.贵州水银洞超大型卡林型金矿同位素地球化学特征[J].地学前缘,2010,17(2):396-403.
[14]王亮,龙超林,刘义.黔西南隐伏岩体圈定与金矿物源探讨[J].现代地质,2015,29(3):702-711.
[15]邱小平,孟凡强,于波.黔西南灰家堡金矿田成矿构造特征研究[J].矿床地质,2013,32(4):783-793.
[16]聂爱国,李俊海,欧文,管代云,梅世全.黔西南卡林型金矿床形成特殊性研究[J].黄金,2008,2(29):4-8.
[17]牛翠祎,王科强,李绍儒.滇黔桂成矿区金矿资源预测评价[J].中国地质,2011,38(6):1 576-1 583.
[18]刘建中,陈景河,邓一明.贵州水银洞超大型金矿勘查实践及灰家堡矿集区勘查新进展[J].地质调查与研究,2009,32(2):138-143.
[19]刘建中,夏勇,陶琰,等.贵州西南部SBT与金锑矿成矿找矿[J].贵州地质,2014,31(4):267-272.
[20]ZHANG Yu,XIA Yong,SU Wenchao,TAO Yan,ZHANG Xingchun,LIU Jianzhong,DENG Yiming.Metallogenic model and prognosis of the Shuiyindong super-large strata-bound Carlin-tpye gold deposit,southwestern Guizhou Porvince,China[J].Chin.J.Geochem,2010(29):157-166.
[21]刘建中,夏勇,张兴春,邓一明,苏文超,陶琰.层控卡林型金矿床矿床模型-贵州水银洞超大型金矿[J].黄金科学技术,2008,16(3):1-5.
[22]陶平,马荣,雷志远.扬子区黔西南金矿成矿系统综述[J].地质与勘探,2007,43(4):24-28.
[23]杨振威,张昆,严加永,陈向斌.宁-芜矿集区及其西缘深部结构初探[J].地球物理学报,2012,55(12):4160-4168.
[24]尹兵祥,王光鄂.大地电磁阻抗张量正则分解的地质含义分析[J].地球物理学报,2011,44(2):279-288.
[25]Schmucker U,Janknowsky J.Geomagnetic induction studies and the electrical state of the upper mantle[J].Tectonophyics,1972,13:233-256.
[26]马晓冰,孔祥儒,刘宏兵,闫永利.青藏高原东北部地区地壳电性结构特征[J].地球物理学报,2005,48(3):689-697.
[27]杨生,鲍光淑,张全胜.远参考大地电磁测深法应用研究[J].物探与化探,2002,26(1):27-31.
[28]Smith JT,Booker JR.Rapid inversion of two and three dimensional magnetotelluric data[J].Geophys.Res.1996,96(B3):3905-3922.
[29]De Groot-Hedlin C,Constable SC.Occam’s inversion to generate smooth,two-dimensional models from magnetotelluric data[J].Geophysics,1990,55(12):1613-1624.
[30]Rodi W,Mcakie RL.Nonlinear conjugate gradients algorithm for 2-D magnetotelluric inversion[J].Geophysics,2001,66(1):174-187.
[31]Ledo J,Queralt P,Marti A,et al.Two-dimensional interpretation of three-dimensional magnetotelluric data:An example of limitations and resolution[J].Geophys.J.Int.,2002,150(1):127-139.
[32]Wannamaker P E,Hohmann G W,Ward S H.Magnetotelluric responses of three-dimensional bodies in layered earths[J].Geophysics,1984,49:1 517-1 533.
[33]Siripunvaraporn W,Egbert G.An efficient data-subspace inversion method for 2-D magnetotelluric data[J].Geophysics,2000,65(3):791-803.
[34]Hansen P C.Analysis of discrete ill-posed problems by means of the L-Curve.SIAM Review[J].1992,34(4):561-580.
[35]谢成良,叶高峰,魏文博,金胜.藏北高原主要断裂带电性结构特征[J].地球物理学报,2012,55(12):3 991-4 002.
[2]WANG Chenghui,WANG Denghong,XU Jue,YING Lijuan,LIU Lijun,LIU Shaobao.A preliminary review of metallogenic regularity of gold deposits in China[J].ACTC GEOLOGICA SINICA(English Edition),2015,89(2):632-651.
[3]杨治,何朋友,刘伟,柳建新,代伦,韩雪.黔西南卡林型金矿床稀土元素地球化学特征[J].广东微量元素科学,2011,18(11):59-66.
[4]李得刚,曾小华,关有国,张国伟,曲建明.中国卡林型金矿床成矿地质特征探讨[J].有色金属(矿山部分),2012,66(1):24-30.
[5]NIE Aiguo,MEI Shiquan,GUAN Daiyun,WU Pan,ZHUANG Zhuru.A study on the genetic relations between Permian Longtan Formation coal series strata and Carlin-type gold deposits,southwestern Guizhou Province,China[J].Chin.J.Geochem,2008,27:291-298.
[6]刘建中,刘川勤.贵州水银洞金矿床成因探讨及成矿模式[J].贵州地质,2005,22(1):9-13.
[7]刘建中,邓一明,刘川勤.贵州省贞丰县水银洞层控特大型金矿成矿条件与成矿模式.中国地质,2006,33(1):169-177.
[8]周余国,刘继顺,王作华,欧阳玉飞,高启芝,刘德利,黄元有.从滇黔桂“金三角”区域地层地球化学演化特征探讨卡林型金矿的物质来源[J].地学前缘,2009,16(2):199-208.
[9]王泽鹏,夏勇,宋谢炎,游彬,邓新华,汪小勇.黔西南卡林型金矿成矿物质深部来源:来自同位素和稀土元素证据[J].矿床地质,2010,增刊(29):519-520.
[10]陈懋弘.滇黔桂卡林型金矿的构造型式和构造背景[J].矿物学报,2011,(增刊):192-193.
[11]郑禄林.黔西南卡林型金矿研究现状及展望[J].矿产与地质,2015,29(1):59-64.
[12]刘建中,夏勇,邓一明.贵州水银洞超大型金矿床金的赋存状态再研究[J].贵州地质,2007,24(3):165-169.
[13]王成辉,王登红,刘建中.贵州水银洞超大型卡林型金矿同位素地球化学特征[J].地学前缘,2010,17(2):396-403.
[14]王亮,龙超林,刘义.黔西南隐伏岩体圈定与金矿物源探讨[J].现代地质,2015,29(3):702-711.
[15]邱小平,孟凡强,于波.黔西南灰家堡金矿田成矿构造特征研究[J].矿床地质,2013,32(4):783-793.
[16]聂爱国,李俊海,欧文,管代云,梅世全.黔西南卡林型金矿床形成特殊性研究[J].黄金,2008,2(29):4-8.
[17]牛翠祎,王科强,李绍儒.滇黔桂成矿区金矿资源预测评价[J].中国地质,2011,38(6):1 576-1 583.
[18]刘建中,陈景河,邓一明.贵州水银洞超大型金矿勘查实践及灰家堡矿集区勘查新进展[J].地质调查与研究,2009,32(2):138-143.
[19]刘建中,夏勇,陶琰,等.贵州西南部SBT与金锑矿成矿找矿[J].贵州地质,2014,31(4):267-272.
[20]ZHANG Yu,XIA Yong,SU Wenchao,TAO Yan,ZHANG Xingchun,LIU Jianzhong,DENG Yiming.Metallogenic model and prognosis of the Shuiyindong super-large strata-bound Carlin-tpye gold deposit,southwestern Guizhou Porvince,China[J].Chin.J.Geochem,2010(29):157-166.
[21]刘建中,夏勇,张兴春,邓一明,苏文超,陶琰.层控卡林型金矿床矿床模型-贵州水银洞超大型金矿[J].黄金科学技术,2008,16(3):1-5.
[22]陶平,马荣,雷志远.扬子区黔西南金矿成矿系统综述[J].地质与勘探,2007,43(4):24-28.
[23]杨振威,张昆,严加永,陈向斌.宁-芜矿集区及其西缘深部结构初探[J].地球物理学报,2012,55(12):4160-4168.
[24]尹兵祥,王光鄂.大地电磁阻抗张量正则分解的地质含义分析[J].地球物理学报,2011,44(2):279-288.
[25]Schmucker U,Janknowsky J.Geomagnetic induction studies and the electrical state of the upper mantle[J].Tectonophyics,1972,13:233-256.
[26]马晓冰,孔祥儒,刘宏兵,闫永利.青藏高原东北部地区地壳电性结构特征[J].地球物理学报,2005,48(3):689-697.
[27]杨生,鲍光淑,张全胜.远参考大地电磁测深法应用研究[J].物探与化探,2002,26(1):27-31.
[28]Smith JT,Booker JR.Rapid inversion of two and three dimensional magnetotelluric data[J].Geophys.Res.1996,96(B3):3905-3922.
[29]De Groot-Hedlin C,Constable SC.Occam’s inversion to generate smooth,two-dimensional models from magnetotelluric data[J].Geophysics,1990,55(12):1613-1624.
[30]Rodi W,Mcakie RL.Nonlinear conjugate gradients algorithm for 2-D magnetotelluric inversion[J].Geophysics,2001,66(1):174-187.
[31]Ledo J,Queralt P,Marti A,et al.Two-dimensional interpretation of three-dimensional magnetotelluric data:An example of limitations and resolution[J].Geophys.J.Int.,2002,150(1):127-139.
[32]Wannamaker P E,Hohmann G W,Ward S H.Magnetotelluric responses of three-dimensional bodies in layered earths[J].Geophysics,1984,49:1 517-1 533.
[33]Siripunvaraporn W,Egbert G.An efficient data-subspace inversion method for 2-D magnetotelluric data[J].Geophysics,2000,65(3):791-803.
[34]Hansen P C.Analysis of discrete ill-posed problems by means of the L-Curve.SIAM Review[J].1992,34(4):561-580.
[35]谢成良,叶高峰,魏文博,金胜.藏北高原主要断裂带电性结构特征[J].地球物理学报,2012,55(12):3 991-4 002.