鄂尔多斯东南缘地区的地壳结构
摘要
利用布置在鄂尔多斯东南缘地区的地震台阵记录的远震资料数据,采用接收函数方法研究这一地区的地壳厚度和地壳结构.研究结果显示,各台站下方的Moho震相可以被清楚地识别,Moho深度向东南方向逐渐变浅,从鄂尔多斯块体内部的43km一直减小到邻近秦岭北缘的30km左右.地壳结构和Moho形态特征在横向上表现出明显的差异性,在研究区可以分为4个部分:(Ⅰ)在鄂尔多斯块体内部,Moho平缓连续,深度在40km左右,具有稳定克拉通地壳的特征;(Ⅱ)渭河-山西地堑,Moho出现上隆,上隆幅度3km左右,地壳减薄,可能是由上地幔物质上涌引起的;(Ⅲ)熊耳-伏牛山地区,Moho平缓连续,深度在36～33km之间,往东南方向逐渐变浅,地壳结构相对简单;(Ⅳ)邻近秦岭北缘的的河淮盆地,Moho呈现出强烈的不连续特征,横向结构差异明显,平均深度约31km.另外,位于构造边界的两个台站(st11和st18)的下方,Moho呈现明显的不连续现象,可能受到边界断裂的影响.研究结果表明鄂尔多斯东南缘地区地壳结构在横向上有很大的差异和变化,对研究鄂尔多斯东南缘地区不同块体间的相互关系具有重要的意义.
引文
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25Hu S B,He L J,Wang J Y.Heat flow in the continental area of China:A new data set.Earth Planet Sci Lett,2000,179:407-419
26唐有彩,冯永革,陈永顺,等.山西断陷带地壳结构的接收函数研究.地球物理学报,2010,53:2102-2109
27张岳桥,马寅生,杨农.太行山南缘断裂带新构造活动及其区域运动学意义.地震地质,2003,25:169-182
28Huang Z C,Xu M J,Wang L S,et al.Shear wave splitting in the southern margin of the Ordos Block,North China.Geophys Res Lett,2008,35:L19301,doi:10.1029/2008GL035188
29杨明慧,王嗣敏,郑晓凤,等.华北克拉通南部及邻区航磁异常特征与构造分区.地质论评,2009,55:862-872
30徐汉林,赵宗举,杨以宁,等.南华北盆地构造格局及构造样式.地球学报,2003,24:27-33
2吴福元,徐义刚,高山,等.华北岩石圈减薄与克拉通破坏研究的主要学术争论.岩石学报,2008,24:1145-1174
3徐汉林,赵宗举,吕福亮,等.南华北地区的构造演化与含油气性.大地构造与成矿学,2004,28:450-463
4邱瑞照,邓晋福,周肃,等.华北地区岩石圈类型:地质与地球物理证据.中国科学D辑:地球科学,2004,34:698-711
5Huang W,Wu Z W.Evolution of the Qinling orogenic belt.Tectonics,1992,11:371-380
6Zhang Y Q,Vergely P,Mercier J.Active faulting in and along the Qinling Range(China)inferred from SPOT imagery analysis and ex-trusion tectonics of south China.Tectonophysics,1995,243:69-95
7朱日祥,郑天愉.华北克拉通破坏机制与古元古代板块构造体系.科学通报,2009,54:1950-1961
8赵志新,徐纪人.广角反射地震探测得到的中国东部地壳三维P波速度结构.科学通报,2009,54:931-937
9嘉世旭,张先康.华北不同构造块体地壳结构及其对比研究.地球物理学报,2005,48:611-620
10赵国泽,詹艳,王立凤,等.鄂尔多斯断块地壳电性结构.地震地质,2010,32:345-359
11Tian X B,Teng J W,Zhang H S,et al.Structure of crust and upper mantle beneath the Ordos Block and the Yinshan Mountains revealed by receiver function analysis.Phys Earth Planet Int,2011,184:186-193
12Langston C A.Structure under Mount Rainier,Washington,inferred from teleseismic body waves.J Geophys Res,1979,84:4749-4762
13徐强,赵俊猛,崔仲熊,等.青藏高原班公湖-怒江缝合带中部的Moho错断.科学通报,2010,55:80-86
14米宁,王良书,李华,等.天山和塔里木盆山接合部地壳上地幔速度结构研究.科学通报,2005,50:363-368
15吴庆举,田小波,张乃玲,等.计算台站接收函数的最大熵谱反褶积方法.地震学报,2003,25:382-389
16Schimmel M,Paulssen H.Noise reduction and detection of weak,coherent signals through phase-weighted stacks.Geophys J Int,1997,130:497-505
17Yuan X H,Ni J,Kind R,et al.Lithospheric and upper mantle structure of southern Tibet from a seismological passive source experiment.J Geophys Res,1997,102:27491-27500
18Zhu L P,Kanamori H.Moho depth variation in southern California from teleseismic receiver functions.J Geophys Res,2000,105:2969-2980
19Dueker K G,Sheehan A F.Mantle discontinuity structure from midpoint stacks of converted P to S waves across the Yellowstone hotspot track.J Geophys Res,1997,102:8313-8327
20Kind R,Yuan X H,Saul J,et al.Seismic images of crust and upper mantle beneath Tibet:Evidence for Eurasian Plate subduction.Science,2002,298:1218-1221
21Yuan X H,Sobolev S V,Kind R,et al.Subduction and collision processes in the Central Andes constrained by converted seismic phases.Nature,2000,408:958-961
22Pan S,Niu F.Large contrasts in crustal structure and composition between the Ordos plateau and the NE Tibetan plateau from receiver function analysis.Earth Planet Sci Lett,2011,doi:10.1016/j.epsl.2011.01.007
23赵金仁,张先康,王夫运,等.中国煤矿第一爆对华北克拉通岩石圈结构研究的启示.科学通报,2009,54:924-930
24江为为,郝天珧,宋海斌.鄂尔多斯盆地地质地球物理场特征与地壳结构.地球物理学进展,2000,15:45-53
25Hu S B,He L J,Wang J Y.Heat flow in the continental area of China:A new data set.Earth Planet Sci Lett,2000,179:407-419
26唐有彩,冯永革,陈永顺,等.山西断陷带地壳结构的接收函数研究.地球物理学报,2010,53:2102-2109
27张岳桥,马寅生,杨农.太行山南缘断裂带新构造活动及其区域运动学意义.地震地质,2003,25:169-182
28Huang Z C,Xu M J,Wang L S,et al.Shear wave splitting in the southern margin of the Ordos Block,North China.Geophys Res Lett,2008,35:L19301,doi:10.1029/2008GL035188
29杨明慧,王嗣敏,郑晓凤,等.华北克拉通南部及邻区航磁异常特征与构造分区.地质论评,2009,55:862-872
30徐汉林,赵宗举,杨以宁,等.南华北盆地构造格局及构造样式.地球学报,2003,24:27-33
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