利用航磁、重力资料研究川滇地区大陆变形特征
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摘要
利用航磁、重力资料对川滇地区大陆变形特征进行了研究。航磁异常揭示了研究区内的基底性质及其横向差异,研究区内的强烈地震主要集中在航磁异常突变带上,基底性质横向差异有利于应力的相对集中,成为地震孕育和发生的有利部位。康定—绵阳一带刚性基底的阻挡造成了青藏高原下地壳物质向东的塑性流动被迫转向南东—南南东方向,进而造成了川滇菱形块体内广泛的地壳增厚,布格重力异常等值线呈向南东伸出的舌状是其地壳增厚作用的直观反映。川滇地区的大陆变形特征既存在广泛的地壳增厚现象,同时在下地壳塑性流动的驱动下,中、上地壳破碎成大小不一的块体,变形特征表现出整体刚性,因而不能简单地套用“地壳增厚”或“大陆逃逸”模式。
Based on aeromagnetic and gravity data,continental deformation features in Sichuan-Yunnan Region(SYR) have been studied.We get the characteristics of basement and its lateral heterogeneity beneath SYR from aeromagnetic data.The eastward viscosity lower crustal flow of Tibet was blocked by the rigid basement near Kangding-Mianyang area,and turn to SE-SSE direction.Most strong earthquakes occurred on the large areomagnetic variation belts.The lateral heterogeneity of basement,which inferred by large areomagnetic variation,vailed stress concentration,earthquakes preparation and occurrence.We also get distribution of crustal thickness and continental deformation features in SYR from gravity data.On the background of collision between India plate and Eurasia plate and uplifting of Tibet,the viscosity lower crustal flow induced crust thicken extensively,and driven upper middle-up crust break into some big and small sub-blocks.The continental deformation features in SYR,including remotion of rigid sub-block through the movement of huge slip faults and extensive crustal thickening,are not fit "Crustal thickening" mode or "Continental extrusion" mode.
Based on aeromagnetic and gravity data,continental deformation features in Sichuan-Yunnan Region(SYR) have been studied.We get the characteristics of basement and its lateral heterogeneity beneath SYR from aeromagnetic data.The eastward viscosity lower crustal flow of Tibet was blocked by the rigid basement near Kangding-Mianyang area,and turn to SE-SSE direction.Most strong earthquakes occurred on the large areomagnetic variation belts.The lateral heterogeneity of basement,which inferred by large areomagnetic variation,vailed stress concentration,earthquakes preparation and occurrence.We also get distribution of crustal thickness and continental deformation features in SYR from gravity data.On the background of collision between India plate and Eurasia plate and uplifting of Tibet,the viscosity lower crustal flow induced crust thicken extensively,and driven upper middle-up crust break into some big and small sub-blocks.The continental deformation features in SYR,including remotion of rigid sub-block through the movement of huge slip faults and extensive crustal thickening,are not fit "Crustal thickening" mode or "Continental extrusion" mode.
引文
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[15]Hu Shengb iao,He L ijuan,W ang Jiyang,et a.l Comp ilation ofheat flow data in the Ch ina continental area(3 rd)[J].ChineseJournal ofGeophysics,2001,44(5):611-626.[胡圣标,何丽娟,汪集?,等.中国大陆地区大地热流数据汇编(第三版)[J].地球物理学报,2001,44(5):611-626.]
[16]Xu M ingjie,W ang L iangshu,L iu Jianhua,et al.Study on crustand uppermantle structure in A ilaoshan-Honghe fau lts zone fromreceiver functions[J].Science in China(D),2005,35(8):729-737.[徐鸣洁,王良书,刘建华,等.利用接收函数研究哀牢山—红河断裂带地壳上地幔特征[J].中国科学D辑,2005,35(8):729-737.]
[17]Tapponn ier P,PeltzerG,Dain A Y,et a.l Propagating extrusionTecton ics in Asia:New insights from simple experim ents w ithplasticine[J].Geology,1982,10:611-616.
[18]England P,M cKenzie.A th in viscous sheetmodel for continentaldeoformation[J].Geophysics Journal Research,1982,70:295-321.
[2]W ang Q i,Zhang Peizhen,N iu Zh ijun,et al.Present-day crustalmovem ent and tecton ic deformation in Ch ina continent[J].Sciencein China(D),2002,45(10):865-874.
[3]Ma Zongjin,Zhang Peizhen,Ren Jinwei,et a.l New cogn itions onthe global and Ch inese continental crustal movem ents from GPShorizontal vector fields[J].Advances in Earth Science,2003,18(1):4-11.[马宗晋,张培震,任金卫,等.从GPS矢量场对中国及全球地壳运动的新认识[J].地球科学进展,2003,18(1):4-11.]
[4]D eng Q idong,Zhang Peizhen,Rang Yongkang,et al.Basic char-acteristics of active tecton ics of Ch ina[J].Science in China(D),2003,46(4):356-372.
[5]Xu X iwei,W en Xueze,Zheng Rongzhang,et a.l Pattern of latesttecton ic motion and its dynam ics for active b locks in S ichuan-Yun-nan region in Ch ina[J].Science in China(D),2003,46(suppl.Ⅱ):210-226.
[6]Zhang Peizhen,D eng Q idong,Zhang Guom in,et a.l Active tec-ton ic b locks and strong earthquakes in the continent of Ch ina[J].Science in China(D),2003,46(suppl,Ⅱ):15-24.
[7]Su You jin,Q in Jiazheng.Strong earthquake activity and relationto regional neotecton ic movem ent in S ichuan-Yunnan region[J].Earthquake Research in China,2001,17(1):24-34.[苏有锦,秦嘉政.川滇地区强震活动与区域新构造运动的关系[J].中国地震,2001,17(1):24-34.]
[8]Petar Stavrev,Dan iela Gerovska.Magnetic field transform s w ithlow sensitivity to the d irection of source magnetization and h ighcentricity[J].Geophysical Prospecting,2000,48:317-340.
[9]Xu M ingjie,W ang L iangshu,Hu D ezhao,et a.l Aeromagnetic da-ta transform ing and basem ent fau lts analysis in the western Tarimbasin[J].Chinese Journal ofGeophysics,2002,45(suppl.):157-164.[徐鸣洁,王良书,胡德昭,等.塔里木盆地西部航磁数据变换处理与基底断裂分析[J].地球物理学报,2002,45(增刊):157-164.]
[10]Luo Zh ili.New recogn ition of basem ent in sichuan basin[J].Journal of Chengdu University of Technology,1998,25(2):191-200.[罗志立.四川盆地基底结构的认识[J].成都理工大学学报,1998,25(2):191-200.]
[11]Zhong Kai,Xu M ingjie,W ang L iangshu,et al.Geophysical evi-dences of two-segm eng tecton ic evolution of the western S ichuanforeland basin[J].Acta Petrolei Sinica,2004,25(6):29-32,37.[钟锴,徐鸣洁,王良书,等.川西两期前陆盆地南北两段构造演化的地球物理特征[J].石油学报,2004,25(6):29-32,37.]
[12]W ang Chunyong,MooneyW D,W ang X ili,et al.Study on 3-Dvelocity structure of crust and upper mantle in S ichuan-Yunnanregion,Ch ina[J].Acta Seism ologica Sinica,2002,24(1):1-16.[王椿镛,MooneyW D,王溪莉,等.川滇地区地壳上地幔三维速度结构[J].地震学报,2002,24(1):1-16.]
[13]Teng Jiwen.Physics and Dynam ics of L ithosphere in Kangd ianStructural Belt[M].Beijing:Science Press,1994.41-50.[滕吉文主编.康滇构造带岩石圈物理与动力学[M].北京:科学出版社,1994.41-50.]
[14]Zhong Kai,XuM ingjie,W ang L iangshu,et al.Study on charac-teristics of gravity field and crustal deformation in S ichuan-Yun-nan region[J].Geological Journal ofChina Universities,2005,11(1):111-117.[钟锴,徐鸣洁,王良书,等.川滇地区重力场特征与地壳变形研究[J].高校地质学报,2005,11(1):111-117.]
[15]Hu Shengb iao,He L ijuan,W ang Jiyang,et a.l Comp ilation ofheat flow data in the Ch ina continental area(3 rd)[J].ChineseJournal ofGeophysics,2001,44(5):611-626.[胡圣标,何丽娟,汪集?,等.中国大陆地区大地热流数据汇编(第三版)[J].地球物理学报,2001,44(5):611-626.]
[16]Xu M ingjie,W ang L iangshu,L iu Jianhua,et al.Study on crustand uppermantle structure in A ilaoshan-Honghe fau lts zone fromreceiver functions[J].Science in China(D),2005,35(8):729-737.[徐鸣洁,王良书,刘建华,等.利用接收函数研究哀牢山—红河断裂带地壳上地幔特征[J].中国科学D辑,2005,35(8):729-737.]
[17]Tapponn ier P,PeltzerG,Dain A Y,et a.l Propagating extrusionTecton ics in Asia:New insights from simple experim ents w ithplasticine[J].Geology,1982,10:611-616.
[18]England P,M cKenzie.A th in viscous sheetmodel for continentaldeoformation[J].Geophysics Journal Research,1982,70:295-321.
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