皖南庐江-枞阳多金属矿集区反射地震剖面的速度结构
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摘要
利用反射地震剖面处理过程中获取的叠加速度得到庐枞(庐江-枞阳)矿集区地壳浅部的速度结构剖面,为研究庐枞矿集区近地表-上地壳的结构提供了新依据。地震剖面综合研究表明:郯庐断裂、罗河-缺口断裂、长江断裂是庐枞地区的3条重要的断裂,断裂深部均表现为低速异常。罗河-缺口断裂、长江断裂的发育深度和规模均不及郯庐断裂。火山岩出露地区表现为地震波速高和反射波组凌乱的特征;新生代沉积地层则表现为波速低和反射波组连续的地球物理特征。罗河矿区位于强、弱反射转换区,同时也是低、高速体的转换区。
The velocity section computed by processing reflection seismic data can provide new image of the structure from the surface to the upper crust in the Luzong(Lujiang-Zongyang) polymetallic ore concentration belt.Studies show that Tanlu fault,Luohe-Quekou fault and Changjiang fault are main faults in this area,showing relatively low velocity characteristics.Tanlu fault is deeper and larger than other faults.Seismic wave velocity becomes faster in volcanic rocks with disorderly reflection,but becomes slower with continuous reflection in Cenozoic sedimentary basement.The Luohe ore district is located in a transfer zone between strong and weak reflection and between high and low velocity.
The velocity section computed by processing reflection seismic data can provide new image of the structure from the surface to the upper crust in the Luzong(Lujiang-Zongyang) polymetallic ore concentration belt.Studies show that Tanlu fault,Luohe-Quekou fault and Changjiang fault are main faults in this area,showing relatively low velocity characteristics.Tanlu fault is deeper and larger than other faults.Seismic wave velocity becomes faster in volcanic rocks with disorderly reflection,but becomes slower with continuous reflection in Cenozoic sedimentary basement.The Luohe ore district is located in a transfer zone between strong and weak reflection and between high and low velocity.
引文
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[14]董树文,高锐,吕庆田,等.庐江-枞阳矿集区深部结构与成矿[J].地球学报,2009,30(3):279-284.
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[2]滕吉文.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[J].地质通报,2006,25(7):767-771.
[3]吕庆田,史大年,赵金花,等.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[J].地质通报,2005,24(3):211-218.
[4]Brown L D.A new map of crustal“terranes”in the United Statesfrom COCORP deep seismic reflection profiling[J].Geophy J.Int.,1991,105:3-13
[5]Nelson K D,Zhao W J,Brown L D,et al.Partially molten middlecrust beneath Southern Tibet:Synthesis of project INDEPTH results[J].Science,1996,274:1684-1688.
[6]高锐,王海燕,马永生,等.松潘地块若尔盖盆地与西秦岭造山带岩石圈尺度的构造关系——深地震反射剖面探测成果[J].地球学报,2006,27(5):411-418.
[7]董树文.长江中下游铁铜矿带成因之构造分析[J].地球学报,1991,23:43-56.
[8]董树文,吴宣志,高锐,等.大别造山带地壳速度结构与动力学[J].地球物理学报,1998,41(3):349-361.
[9]任启江,王德滋,徐兆文,等.安徽庐枞火山-构造洼地的形成、演化及成矿[J].地质学报,1993,67(2):131-145.
[10]谢智,李全忠,陈江峰,等.庐枞早白垩世火山岩的地球化学特征及其源区意义[J].高校地质学报,2007,13(2):235-249.
[11]Wu F Y,Lin J Q,Wilde S A,et al.Nature and significance of theEarly Cretaceous giant igneous event in eastern China[J].Earth Planet.Sci.Lett.,2005,233:103-119.
[12]Zhou T F,et al.Geochemistry and evolution of ore-forming fluidsof the Yueshan Cu-Au skarn-and vein-type deposits,AnhuiProvince,South China[J].Ore Geol.Rev.,2007,31:279-303.
[13]周涛发,范裕,袁峰,等.安徽庐枞(庐江-枞阳)盆地火山岩的年代学及其意义[J].中国科学(D辑),地球科学,2008,38(11):1342-1353.
[14]董树文,高锐,吕庆田,等.庐江-枞阳矿集区深部结构与成矿[J].地球学报,2009,30(3):279-284.
[15]Chakraborty A著,徐炎东译.利用小波变换法对地震数据进行频率-时间域分解[J].勘探地球物理进展,1996,(3):10-21.
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