鄂尔多斯地区重力均衡研究
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摘要
利用鄂尔多斯地块及其周边地区高精度的数字地形和实测重力资料,采用Airy重力均衡模式,计算出了鄂尔多斯及周边地区(32°~43°N,102°~117°E)的重力均衡异常值。结果表明,鄂尔多斯地区整体基本达到均衡状态,部分地区处于亚均衡状态,均衡异常具有明显的分块特征:东部的平原大部分均衡异常值在20mGal以下,表明基本处于均衡状态;在西部和北部山区多为正异常,大部分地区还存在失衡现象。
By using high accurate data of topography and measured gravity data,the isostatic gravity anomaly of Ordos block and its adjacent areas(32°～43°N,102°～117°E) were calculated according to Airy local isostatic model.The results show that most areas are in the isostatic status except part of Ordos block.The isostatic value is around 20 mGal in eastern part of Ordos block,indicating that basically isostatic status has been reached while some places in west and north of Ordos block is still in unisostitc status.
By using high accurate data of topography and measured gravity data,the isostatic gravity anomaly of Ordos block and its adjacent areas(32°～43°N,102°～117°E) were calculated according to Airy local isostatic model.The results show that most areas are in the isostatic status except part of Ordos block.The isostatic value is around 20 mGal in eastern part of Ordos block,indicating that basically isostatic status has been reached while some places in west and north of Ordos block is still in unisostitc status.
引文
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[3]张岳桥,廖昌珍,施炜,等.鄂尔多斯盆地周边地带新构造演化及其区域动力学背景[J].高校地质学报,2006,12(3):285~297.
[4]Tapponnier P,Molnar P.Slip-line field theory andlarge-scale continental tec[J].Nature,1976,264:319~324.
[5]范俊喜,马瑾,甘卫军,等.鄂尔多斯地块运动的整体性与不同方向边界活动的交替性[J].中国科学(D),2003,33:119~128.
[6]吴宗絮,邓晋福,杨主恩,等.华北大陆地壳-上地幔岩石学结构与演化[J].岩石矿物学杂志,1994,13(2):106~115.
[7]臧绍先,李昶,宁杰远,等.华北岩石圈三维流变结构的一种初步模型[J].中国科学(D辑),2002,32(7):588~597.
[8]屈健鹏,朱佐全,杨国栋,等.鄂尔多斯地块西缘定边—景泰地壳和上地幔电性结构分析[J].西北地震学报,1998,20(2):70~75.
[9]于鹏,王一新,王家林,等.鄂尔多斯盆地南部MT剖面综合地球物理解释[J].石油物探,1999,38(3):86~92.
[10]陈九辉,刘启元,李顺,等.青藏高原东北缘—鄂尔多斯地块地壳上地幔S波速度结构[J].地球物理学报,2005,48(2):333~342.
[11]Lewis B T R,L M Dorman.Experimental Isostasy2,An isostatic model for the U.S.A.derived fromgravity and topographic data[J].J.Geophys.Res.1970,75:3367~3386.
[12]Dorman L M,B T R Lewis.Experimental Isostasy1,Theory of the determination of the isostatic re-sponse to a concentrated load,[J].J.Geophys.Res.1970,75(17):3357~3365.
[13]McNutt M.Parker R.Isostasy in Australia and theevolution of the compensation mechanism[J].Sci-ence,1978,99(4330):773~775.
[14]Forsyth D W.Subsurface loading and estimates ofthe flexural rigidity of continental lithosphere[J].J.Geophys.Res.1985,90(B12):12623~12632.
[15]Simpson R W,Jachens R C.and Blakely,R.J.,Anew isostatic residual gravity map of the contermi-nous United States with a discussion on the signifi-cance of isostatic residual anomalies[J].J.Geo-phys.Res.,1986,91(B8):8348~8372.
[16]Jin,Y.,M.K.McNutt,Y.S.Zhu,Evidencefrom gravity and topography data for folding of Ti-bet[J].Nature,1994,371:669~674.
[17]Watts A.Isostasy and Flexure of the Lithosphere[M].,Cambridge University Press,2001.
[18]冯锐,王均,郑书真,等.论华北地区的均衡状态(一)—方法和局部补偿[J].地震学报,1987,9(4):406~418.
[19]刘明清,祝治平,方盛明,等.山西中南部地区地壳深部地球物理场异常与地震[J].地震学报,1999,21(3):305~312.
[20]郭飚,刘启元,陈九辉,等.青藏高原东北缘—鄂尔多斯地壳上地幔地震层析成像研究[J].地球物理学报,2004,47(5):790~797.
[21]Han Z,Xu J,Ran K.Active blocks and strong re-gion seismic activity in North China[J].Science inChina(Series D)(suppl),2003,(46):153~166.
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