长江中下游金属矿集区近地表速度结构层析成像实验及应用
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摘要
利用矿集区获得的小道距、长排列接收的地震反射初至波走时数据,运用层析成像方法,首次得到长江中下游典型金属矿集区——庐枞火山岩盆地近地表1000m以上的交叉速度结构。各剖面精细的速度结构揭露出庐枞矿集区隐伏的正长岩体顶界面深度与起伏形态,发现岩体顶面凸起及陡变化部位与矿体分布存在着明显的对应关系,罗河铁矿、小岭铁矿、龙桥铁矿、马鞭山铁矿处对应着高速层顶界面的凸起位置。罗河断裂在lz06-1线与lz06-3线表现为明显的横向速度变化界面。这些结果表明,长排列的深地震反射初至波走时层析成像方法能够为金属矿集区深部隐伏矿床的勘探研究提供丰富的地壳浅表结构(0～1000m)信息。
Four cross-deep seismic reflection profiles at the Luzhong iron-polymetallic deposits in the Lower and Middle Yangtze Reaches were performed by the Chinese Academy of Geological Sicences(CAGS) before the Chinese New Year of 2007.The near-surface(~1000m) velocity model for the Luzhong volcanoic rock basin was established for the first time using the first break-arrivals of these long-offset shot records and tomography method.The various fine imaging results show the height and undulated shape of blind syenite,discovering there is corresponding relation between positions of top interface and change of the syenite,and distribution of ore bodies,with Luohe,Xiaoling,Longqiao,and Mabianshan iron deposits all situating at the salient sections in high-speed top interface.The Luohe fault presents an obvious horizontal velocity transformation interface in line lz06-1 and line lz06-3.The research results indicate that the long-offset first arrival travel-time tomography method can provide abundant crustal shallow structure information(0~1000m) for the study of prospect for the deep concealed deposits and the potential prospecting direction for iron-polymetallic deposits in the Luzhong area,Anhui province.
Four cross-deep seismic reflection profiles at the Luzhong iron-polymetallic deposits in the Lower and Middle Yangtze Reaches were performed by the Chinese Academy of Geological Sicences(CAGS) before the Chinese New Year of 2007.The near-surface(~1000m) velocity model for the Luzhong volcanoic rock basin was established for the first time using the first break-arrivals of these long-offset shot records and tomography method.The various fine imaging results show the height and undulated shape of blind syenite,discovering there is corresponding relation between positions of top interface and change of the syenite,and distribution of ore bodies,with Luohe,Xiaoling,Longqiao,and Mabianshan iron deposits all situating at the salient sections in high-speed top interface.The Luohe fault presents an obvious horizontal velocity transformation interface in line lz06-1 and line lz06-3.The research results indicate that the long-offset first arrival travel-time tomography method can provide abundant crustal shallow structure information(0~1000m) for the study of prospect for the deep concealed deposits and the potential prospecting direction for iron-polymetallic deposits in the Luzhong area,Anhui province.
引文
常旭,王辉.1998.地震法隐伏矿脉空间定位研究.地球物理学报,41(3):408～415.
常印佛,刘湘培,吴言昌.1991.长江中下游铜铁成矿带.北京:地质出版社,1～56.
董树文.1991.长江中下游铁铜矿带成因之构造分析.中国地质科学院报,23:43～56.
董树文,高锐,吕庆田,张季生,张荣华,薛怀民,吴才来,卢占武,马立成.2009.庐江-枞阳矿集区深部结构与成矿.地球学报,30(3):279～284.
冯锐,李晓芹,陶裕录,孙次昌,刘晓芹,郝锦绮.1997.电阻率层析成像用于水文地质勘探.地震学报,19(6):655～663.
侯贺晟,高锐,卢占武,贺日政,李秋生,管烨,李朋武,熊小松.2009.青藏高原羌塘中央隆起近地表速度结构的初至波层析成像试验.地质通报,28(6):738～745.
林伯香,孙晶梅,刘清林.2002.层析成像低速带速度反演和静校正方法.石油物探,41(2):136～140.
刘湘培,常印佛,吴言昌.1988.论长江中下游地区成矿条件和成矿规律.地质学报,62(2):167～177.
吕庆田,史大年,赵金花,严加永,徐明才.2005.深部矿产勘查的地震学方法:问题与前景——铜陵矿集区的应用实例.地质通报,24(3):211～218.
吕庆田,杨竹森,严加永,徐文艺.2007.长江中下游成矿带深部成矿潜力、找矿思路与初步尝试.地质学报,81(7):865～881.
任启江,刘孝善,徐兆文.1991.安徽庐枞中生代火山构造洼地及其成矿作用.北京:地质出版社,1～145.
任启江,王德滋.1993.安徽庐枞火山-构造洼地的形成、演化及成矿.地质学报,67(2):131～145.
荣立新.2007.应用于金属矿勘查中的地面地震层析成像技术.物探化探计算技术,29(增刊):125～128.
史大年,吕庆田,徐明才,赵金花.2004.铜陵矿集区地壳浅表结构的地震层析研究.矿床地质,23(3):383～389.
宋桂桥,尹天奎,刘连升.2008.关于塔里木沙漠区低速带调查重新定位的思考.石油物探,47(4):372～375.
滕吉文.2006.强化开展地壳内部第二深度空间金属矿产资源地球物理找矿、勘探和开发.地质通报,25(7):767～771.
吴言昌,王迎春,梁善荣,刘湘培.1988.长江中下游富钠闪长岩类与铁矿系列的成因关系.矿床地质,7(1):14～24.
杨荣勇,任启江,徐兆文,徐立.1996.安徽庐枞地区中生代火山岩区巴家滩火山穹窿的研究.地质论评,42(2):136～143.
翟裕生,姚书振,林新多.1992.长江中下游地区铁铜(金)成矿规律.北京:地质出版社,12～35.
张少斌,范永香.1993.玢岩型铁硫多金属矿床系列.地质找矿论丛,8(3):63～70.
周涛发,范裕,袁峰,陆三明,尚世贵,Daivd C,Sebastien M,赵国春.2008.安徽庐枞(庐江-枞阳)盆地火山岩的年代学及其意义.中国科学D辑:地球科学,38(11):1342～1353.
Bishop T N,Bube K P,Cutler R T.1985.Tomographicdetermination of velocity and depth in laterally varying media.Geophysics,50:903～923.
Hole J A,Ryberg T,Fuis G S,Bleibinhaus F,Sharma A K.2006.Structure of the San Andreas fault zone at SAFOD from aseismic refraction survey.Geophysical Research Letters,33(7),L07312,doi:10.1029/2005GL025194.
Snyder D B,Roberts B J.2007.Seismic tomographic cross-sections of the Bowser Basin in northwest British Columbia,Canada.Bulletin of Canadian petroleum geology,55(4):275～284.
Wu F Y,Lin J Q,Wilde S A,Zhang X O,Yang J H,2005.Natureand significance of the Early Cretaceous giant igneous event ineastern China.Earth Planet Sci Lett,233:103～119.
Zelt B C,Ellis R M,Zelt C A,Hyndman R D,Lowe C,Spence GD,Fisher M A.2001.Three-dimensional crustal velocitystructure beneath the Strait of Georgia,British Columbia.Geophysical Journal International,44(3):695～712.
Zhou T F,Yuan F,Yue S C.2007.Geochemistry and evolution ofore-forming fluids of the Yueshan Cu-Au skarn-and vein-typedeposits,Anhui Province,South China.Ore Geol Rev,31:279～303.
常印佛,刘湘培,吴言昌.1991.长江中下游铜铁成矿带.北京:地质出版社,1～56.
董树文.1991.长江中下游铁铜矿带成因之构造分析.中国地质科学院报,23:43～56.
董树文,高锐,吕庆田,张季生,张荣华,薛怀民,吴才来,卢占武,马立成.2009.庐江-枞阳矿集区深部结构与成矿.地球学报,30(3):279～284.
冯锐,李晓芹,陶裕录,孙次昌,刘晓芹,郝锦绮.1997.电阻率层析成像用于水文地质勘探.地震学报,19(6):655～663.
侯贺晟,高锐,卢占武,贺日政,李秋生,管烨,李朋武,熊小松.2009.青藏高原羌塘中央隆起近地表速度结构的初至波层析成像试验.地质通报,28(6):738～745.
林伯香,孙晶梅,刘清林.2002.层析成像低速带速度反演和静校正方法.石油物探,41(2):136～140.
刘湘培,常印佛,吴言昌.1988.论长江中下游地区成矿条件和成矿规律.地质学报,62(2):167～177.
吕庆田,史大年,赵金花,严加永,徐明才.2005.深部矿产勘查的地震学方法:问题与前景——铜陵矿集区的应用实例.地质通报,24(3):211～218.
吕庆田,杨竹森,严加永,徐文艺.2007.长江中下游成矿带深部成矿潜力、找矿思路与初步尝试.地质学报,81(7):865～881.
任启江,刘孝善,徐兆文.1991.安徽庐枞中生代火山构造洼地及其成矿作用.北京:地质出版社,1～145.
任启江,王德滋.1993.安徽庐枞火山-构造洼地的形成、演化及成矿.地质学报,67(2):131～145.
荣立新.2007.应用于金属矿勘查中的地面地震层析成像技术.物探化探计算技术,29(增刊):125～128.
史大年,吕庆田,徐明才,赵金花.2004.铜陵矿集区地壳浅表结构的地震层析研究.矿床地质,23(3):383～389.
宋桂桥,尹天奎,刘连升.2008.关于塔里木沙漠区低速带调查重新定位的思考.石油物探,47(4):372～375.
滕吉文.2006.强化开展地壳内部第二深度空间金属矿产资源地球物理找矿、勘探和开发.地质通报,25(7):767～771.
吴言昌,王迎春,梁善荣,刘湘培.1988.长江中下游富钠闪长岩类与铁矿系列的成因关系.矿床地质,7(1):14～24.
杨荣勇,任启江,徐兆文,徐立.1996.安徽庐枞地区中生代火山岩区巴家滩火山穹窿的研究.地质论评,42(2):136～143.
翟裕生,姚书振,林新多.1992.长江中下游地区铁铜(金)成矿规律.北京:地质出版社,12～35.
张少斌,范永香.1993.玢岩型铁硫多金属矿床系列.地质找矿论丛,8(3):63～70.
周涛发,范裕,袁峰,陆三明,尚世贵,Daivd C,Sebastien M,赵国春.2008.安徽庐枞(庐江-枞阳)盆地火山岩的年代学及其意义.中国科学D辑:地球科学,38(11):1342～1353.
Bishop T N,Bube K P,Cutler R T.1985.Tomographicdetermination of velocity and depth in laterally varying media.Geophysics,50:903～923.
Hole J A,Ryberg T,Fuis G S,Bleibinhaus F,Sharma A K.2006.Structure of the San Andreas fault zone at SAFOD from aseismic refraction survey.Geophysical Research Letters,33(7),L07312,doi:10.1029/2005GL025194.
Snyder D B,Roberts B J.2007.Seismic tomographic cross-sections of the Bowser Basin in northwest British Columbia,Canada.Bulletin of Canadian petroleum geology,55(4):275～284.
Wu F Y,Lin J Q,Wilde S A,Zhang X O,Yang J H,2005.Natureand significance of the Early Cretaceous giant igneous event ineastern China.Earth Planet Sci Lett,233:103～119.
Zelt B C,Ellis R M,Zelt C A,Hyndman R D,Lowe C,Spence GD,Fisher M A.2001.Three-dimensional crustal velocitystructure beneath the Strait of Georgia,British Columbia.Geophysical Journal International,44(3):695～712.
Zhou T F,Yuan F,Yue S C.2007.Geochemistry and evolution ofore-forming fluids of the Yueshan Cu-Au skarn-and vein-typedeposits,Anhui Province,South China.Ore Geol Rev,31:279～303.
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