青藏高原东北缘壳幔过渡带研究
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摘要
利用穿过青藏高原东北缘的两条地震测深剖面提供的PMP波形资料 ,研究了该区不同构造单元壳幔过渡带的复杂性、频谱特征和速度模型 .结果表明 ,鄂尔多斯盆地和陵中盆地Moho具有稳定的构造特征 ,壳幔耦合为简单的一级间断面 ;海原地震区和巴颜喀拉地块与柴达木地块结合带莫霍面具有明显的活动迹象 ,壳幔耦合为复杂的高、低速相间的多层壳幔过渡带 ,总厚度达到 2 0多千米 .不同构造单元的莫霍面差异性反映了研究区壳幔耦合层的非均匀特征 ;海原地震区和玛沁断裂壳幔过渡带的细结构差异 ,则反映了两个陆 陆碰撞带不同的深部物质结构与地块之间的相互作用结果
This study deals with complexity, frequency spectrum and velocity model of the crust mantle transitional zone in different tectonic units along the northeast margin of Qinghai Xizang plateau, based on P M P waveform data from two deep seismic sounding profiles passing through the area. It reveals that Moho has stable tectonic features in Ordos and Lingzhong basins, where crust and mantle are coupled as first order discontinuity. Moho shows obvious signs of activity in Haiyuan seismic region and in the contact zone between Bayanhar block and Qaidam block. Crust and mantle in these two areas are coupled as complicated crust mantle transitional zone consisting of multiple laminae with alternate high and low velocities, totaling 20 km in thickness. The difference between Moho of different tectonic units reflects heterogeneity of the coupled crust mantle zone; the difference between fine structures of Haiyuan seismic region and Maqin fault zone reflects different deep material composition of the two continent continent collision zones and the interaction between blocks.
This study deals with complexity, frequency spectrum and velocity model of the crust mantle transitional zone in different tectonic units along the northeast margin of Qinghai Xizang plateau, based on P M P waveform data from two deep seismic sounding profiles passing through the area. It reveals that Moho has stable tectonic features in Ordos and Lingzhong basins, where crust and mantle are coupled as first order discontinuity. Moho shows obvious signs of activity in Haiyuan seismic region and in the contact zone between Bayanhar block and Qaidam block. Crust and mantle in these two areas are coupled as complicated crust mantle transitional zone consisting of multiple laminae with alternate high and low velocities, totaling 20 km in thickness. The difference between Moho of different tectonic units reflects heterogeneity of the coupled crust mantle zone; the difference between fine structures of Haiyuan seismic region and Maqin fault zone reflects different deep material composition of the two continent continent collision zones and the interaction between blocks.
引文
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许志琴,杨经绥,姜枚,等.2001.青藏高原北部东昆仑羌塘地区的岩石圈结构及岩石圈剪切断层[J].中国科学(D辑),31(增刊):1～7
曾融生,丁志峰,吴庆举.1998.喜马拉雅祁连山地壳构造与大陆大陆碰撞过程[J].地球物理学报,41(1):49～60
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张培震,邓起东,张国民,等.2003.中国大陆活动地块与强震[J].中国科学(D辑),33(增刊):12～20
郑剑东,杨巍然,郭铁鹰.1989.大地构造[A].见:马杏垣主编.中国岩石圈动力学地图集[C].北京:地图出版社,4
MereuRF .1990.Thecomplexityofthecrustfromrefraction/wide anglereflectiondata[J].Geophysics,132(1/2):269～288
丁国瑜,蔡文伯,于品清,等编著.1991.中国岩石圈动力学概论[M ].北京:地震出版社,29～34
高锐,李朋武,李秋生,等.2001.青藏高原北缘碰撞变形的深部过程深地震探测成果之启示[J].中国科学(D辑),31(增刊):66～71
黄立人,王敏.2003.中国大陆构造块体的现今活动和变形[J].地震地质,25(1):23～32
赖晓玲,李松林,张先康,等.2001.玛沁—兰州—靖边剖面壳幔复杂性的研究[J].地球物理学进展,16(2):65～72
赖晓玲.2004.壳幔过渡带的复杂性方法和应用[J].物探与化探(待发表)
赖晓玲,张先康,李松林,等.2003.小波多分辨分析在壳幔非均匀尺度研究中的应用[J].地球物理学报,46(1):47～53
李清河,郭守年,吕德微编著.1999.鄂尔多斯西缘与西南缘深部结构与构造[M ].北京:地震出版社,1～256
李世雄,汪继文.2000.信号的瞬时参数与正交小波基[J].地球物理学报,43(1):97～104
李松林,张先康,张成科,等.2002.玛沁—兰州—靖边地震测深剖面地壳速度结构的初步研究[J].地球物理学报,45(2):210～217
刘宝峰,李松林,张先康,等.2003.玛沁—靖边剖面S波资料研究与探讨[J].地震学报,25(1):82～88
潘裕生,孔祥儒主编.1998.青藏高原岩石圈结构演化和动力学[M ].广州:广东科技出版社,1～426
孙鸿烈,郑度主编.1998.青藏高原形成、演化与发展[M ].广州:广东科技出版社,1～348
王敏,沈正康,牛之俊,等.2003.现今中国大陆地壳运动与活动块体模型[J].中国科学(D辑),33(增刊):21～32
许志琴,杨经绥,姜枚,等.2001.青藏高原北部东昆仑羌塘地区的岩石圈结构及岩石圈剪切断层[J].中国科学(D辑),31(增刊):1～7
曾融生,丁志峰,吴庆举.1998.喜马拉雅祁连山地壳构造与大陆大陆碰撞过程[J].地球物理学报,41(1):49～60
曾融生,丁志峰,吴庆举,等.2000.喜马拉雅及南藏的地壳俯冲带地震学证据[J].地球物理学报,43(6):780～797
张培震,邓起东,张国民,等.2003.中国大陆活动地块与强震[J].中国科学(D辑),33(增刊):12～20
郑剑东,杨巍然,郭铁鹰.1989.大地构造[A].见:马杏垣主编.中国岩石圈动力学地图集[C].北京:地图出版社,4
MereuRF .1990.Thecomplexityofthecrustfromrefraction/wide anglereflectiondata[J].Geophysics,132(1/2):269～288
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