鄂尔多斯地块重力均衡的地球动力学意义
|
摘要
本文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A iry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。通过对该地区重力均衡异常的分析,结合该地区的地震活动性等研究成果,表明大部分地震都沿着均衡状态发生明显变化的地区附近发生。
By using high accurate data of topography and measured gravity data,the isostatic gravity anomaly of Ordos block and its surrounding areas(32°～43°N,102°～117°E) were calculated according to Airy local isostatic model.From our results,we can conclude that most earthquakes occurred around the area where isostasy anomalies or its gradient changes abruptly,which coordinate to the high seismicity and high geothermal anomalies.
By using high accurate data of topography and measured gravity data,the isostatic gravity anomaly of Ordos block and its surrounding areas(32°～43°N,102°～117°E) were calculated according to Airy local isostatic model.From our results,we can conclude that most earthquakes occurred around the area where isostasy anomalies or its gradient changes abruptly,which coordinate to the high seismicity and high geothermal anomalies.
引文
[1]邓起东,程绍平,闵伟,等,鄂尔多斯块体新生代构造活动和动力学的讨论[J],地质力学学报,1999,5(3):13~21.
[2]方盛明,冯锐,田长征,等,亚洲中部地区均衡重力特征及地震活动性[J],地震学报,1997,19(6):650~654.
[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 fieldtheory and large-scale continental tec[J],Nature,1976,264:319-324.
[5]苏刚,以运动地块为单元的区域地震活动研究--鄂尔多斯地块和它的地震活动[J],西北地震学报,1984,6(2):1~9.
[6]刘爱国,卢演俦,丁国瑜,第四纪时期地壳块体相对运动的古地磁记录的初步研究——以陇西和鄂尔多斯块体相对运动为例[J],地震地质,1995,17(4):397~404.
[7]李万伦,卢演俦,丁国瑜,等,鄂尔多斯及其邻近块体相对运动的黄土古地磁证据[J].第四纪研究,2001,21(6):551~559.
[8]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.
[9]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.
[10]Lewis,B.T.R and L.M.Dorman,Experimental Isostasy 2,An isostaticmodel for the U.S.A.derived fromgravity and topographic data[J],J.Geophys.Res.,1970,75:3367-3386.
[11]Dorman,L.M.and B.T.R.Lewis,Experimental Isostasy 1,Theory of thedetermination of the isostatic response to aconcentrated load,[J]J.Geophys.Res.,1970,75(17):3357-3365.
[12]McNutt,M.and Parker,R.,Isostasy inAustralia and the evolution of thecompensation mechanism[J],Science,1978,99(4330):773~775.
[13]Jin,Y.,M.K.McNutt,Y.S.Zhu,Evidence from gravity and topographydata for folding of Tibet[J],Nature,1994,371:669-674.
[14]Watts,A.,Isostasy and Flexure of theLithosphere,Cambridge University Press,2001.
[15]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.
[2]方盛明,冯锐,田长征,等,亚洲中部地区均衡重力特征及地震活动性[J],地震学报,1997,19(6):650~654.
[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 fieldtheory and large-scale continental tec[J],Nature,1976,264:319-324.
[5]苏刚,以运动地块为单元的区域地震活动研究--鄂尔多斯地块和它的地震活动[J],西北地震学报,1984,6(2):1~9.
[6]刘爱国,卢演俦,丁国瑜,第四纪时期地壳块体相对运动的古地磁记录的初步研究——以陇西和鄂尔多斯块体相对运动为例[J],地震地质,1995,17(4):397~404.
[7]李万伦,卢演俦,丁国瑜,等,鄂尔多斯及其邻近块体相对运动的黄土古地磁证据[J].第四纪研究,2001,21(6):551~559.
[8]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.
[9]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.
[10]Lewis,B.T.R and L.M.Dorman,Experimental Isostasy 2,An isostaticmodel for the U.S.A.derived fromgravity and topographic data[J],J.Geophys.Res.,1970,75:3367-3386.
[11]Dorman,L.M.and B.T.R.Lewis,Experimental Isostasy 1,Theory of thedetermination of the isostatic response to aconcentrated load,[J]J.Geophys.Res.,1970,75(17):3357-3365.
[12]McNutt,M.and Parker,R.,Isostasy inAustralia and the evolution of thecompensation mechanism[J],Science,1978,99(4330):773~775.
[13]Jin,Y.,M.K.McNutt,Y.S.Zhu,Evidence from gravity and topographydata for folding of Tibet[J],Nature,1994,371:669-674.
[14]Watts,A.,Isostasy and Flexure of theLithosphere,Cambridge University Press,2001.
[15]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.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心