隐伏在青藏高原中部的东西走向断裂的航磁异常场特征及其意义
|
摘要
1998~2000年完成的青藏高原中西部航磁数据的综合分析结果显示,在青藏高原中部存在一个重要的隐伏断裂带(大致沿革吉北—改则南—错勤北—申扎北)。结合藏东位场分析结果,革吉北—改则南—错勤北—申扎北隐伏断裂可与嘉黎走滑断裂相连。沿该隐伏断裂发生的地震震源机制解显示,该断裂性质与嘉黎走滑断裂相同。因此,该隐伏断裂与位于藏东的嘉黎走滑断裂一起构成了位于高原中部的东西走向的巨型走滑断裂。这种推测得到了相关地质、地球物理证据和数值模拟结果的证实。此外,该巨型走滑断裂可能调节着青藏高原内部的应力分布,从而控制着高原内部的变形特征。
To study regional tectonics in the mid-western Tibet plateau, the data of areomagnetic anomaly suveryed from 1998 to 2000 is reprocessed by upward continuation method.The results of diffe-rent upward continuation levels reveal a significant anomaly of a subtle fault which located between the northern margin of Lhasa terrane and south side of Banggonghu-Nujing Suture,about along Geji North to Gaze South to Cuoqen North to Shenza North,from west to east.Combined with other results,this subtle fault,together with Jiali strike-slip fault,forms a large-scale E-W strike-slip fault in the central Tibet.And the conclusion is also supported by other evidences from surface geology,geophysics and modeling.The E-W strike-slip faults control the force distribution and deformation within Tibet plateau.
To study regional tectonics in the mid-western Tibet plateau, the data of areomagnetic anomaly suveryed from 1998 to 2000 is reprocessed by upward continuation method.The results of diffe-rent upward continuation levels reveal a significant anomaly of a subtle fault which located between the northern margin of Lhasa terrane and south side of Banggonghu-Nujing Suture,about along Geji North to Gaze South to Cuoqen North to Shenza North,from west to east.Combined with other results,this subtle fault,together with Jiali strike-slip fault,forms a large-scale E-W strike-slip fault in the central Tibet.And the conclusion is also supported by other evidences from surface geology,geophysics and modeling.The E-W strike-slip faults control the force distribution and deformation within Tibet plateau.
引文
[1]吴功建,高锐,余钦范,等.青藏高原亚东—格尔木地学断面综合地球物理调查与研究[J].地球物理学报,1991,34(5):552-561.WU Gong-jian,GAO Rui,YU Qin-fan,et al.Interg-rated investigations of the Qinghai-Tibet plateau a-long the Yadong-Golmud geoscience transect[J].Acta Geophysica Sinica,1991,34(5):552-562.
[2]Willett S D,Beaumont C.Subduction of Asian lithos-pheric mantle beneath Tibet inferred from models ofcontinental collision[J].Nature,1994,369:642-645.
[3]Armijo R,Tapponnier P,Han T.Late Cenozoic right-lateral strike-slip faulting across southern Tibet[J].Journal of Geophysical Research,1989,94:2787-2838.
[4]Molnar P,Chen W P.Focal depth and fault plane so-lution of earthquakes under the Tibet Plateau[J].Journal of Geophysical Research,1983,88:1180-1192.
[5]Tapponnier P,Mercier J L,Armijio R P,et al.Fieldevidence for active normal fault in Tibet[J].Nature,1981,294:410-414.
[6]肖序常,李廷栋.青藏高原的构造演化与隆升机制[M].广州:广东科技出版社,2000.XIAO Xu-chang,LI Ting-dong.Tectonic evolutionand uplift of Qinghai-Xizang(Tibet)plateau[M].Guangzhou:Guangdong Science&Technology Press,2000.
[7]张培震,王琪.中国大陆现今地壳运动和构造变形-速度场与活动地块[C]//青藏高原岩石圈现今变动与动力学.北京:地震出版社,2001:21-35.ZHANG Pei-zhen,WANG Qi.Presend-day crustalmovement and tectonic deformation in continental Chi-na GPS velocity field and active tectonic blocks[C]//Study on the recent deformation and dynamics of thelithosphere of Qinghai-Xizang Plateau.Beijing:Seis-mological Publishing House,2001:21-35.
[8]何顺东,丁林,吴根耀,等.藏南格仁错地区孜桂错断裂的第四纪活动及其构造意义[J].地质科学,2002,37(1):8-12.HE Shun-dong,DING Lin,WU Gen-yao,et al.Qua-ternary activity of Ziguicuo fault in Gayringco area,south Xizang,and its tectonic implications[J].ChineseJournal of Geology,2002,37(1):8-12.
[9]尹安.喜马拉雅—青藏高原造山带地质演化——显生宙亚洲大陆生长[J].地球学报,2001,22(3):193-230.YIN An.Geologic evolution of the Himalayan-Tibtanorogen—Phanerozoic growth of Aisa continetal[J].Acta Geoscientia Sinica,2001,22(3):193-230.
[10]Taylor M,Yin A,Ryerson F J,et al.Conjugatestrike-slip faulting along the Bangong-Nujiang su-ture zone accommodates coeval east-west extensionand north-south shortening in the interior of the Ti-betan Plateau[J].Tectonics,2003,22(4):1044.
[11]Lin A,Fu B,Guo J,et al.Co-seismic strike-slipand rupture length produced by the 2001MS8.1 Cen-tral Kunlun earthquake[J].Science,2002,296:2015-2017.
[12]贺日政.青藏高原近南北向裂谷的岩石圈结构及其动力学过程[D].北京:中国地质科学院,2003.HE Ri-zheng.Lithospheric structure of near north-south striking rifts in Tibet Plateau and its geody-namical process[D].Beijing:Chinese Academy Geo-logical Sciences,2003.
[13]Meade B J.Present-day kinematics at the India-Asiacollision zone[J].Geology,2007,35(1):81-84.
[14]杨华,梁月明,王岚,等.青藏高原东部航磁特征及其与构造成矿带的关系[M].北京:地质出版社,1991.YANG Hua,LIANG Yue-ming,WANG Lan,et al.Aeromagnetic character in eastern Tibetan plateauand its relationship with strcutral minarel belt[M].Beijing:Geological Publishing House,1991.
[15]熊盛青,周伏洪,姚正煦,等.青藏高原中西部航磁调查[M].北京:地质出版社,2001.XIONG Sheng-qing,ZHOU Fu-hong,YAO Zheng-xu,et al.Areomagnetic survey in central and westernQinghai-Tibet plateau[M].Beijing:Geological Pub-lishing House,2001.
[16]余钦范,楼海,孙运生,等.亚东—格尔木地学断面区域磁异常数据处理与地体划分[J].中国地质科学院院报,1990,21:174-182.YU Qin-fan,LOU Hai,SUN Yun-sheng,et al.An-alysing regional magnetic anomaly data along geosci-ence transect from Yadong to Golmud and terrane di-visions[J].Bulletin of The Chinese Academy of Geo-logical Sciences,1990,21:174-182.
[17]贺日政,高锐,郑洪伟,等.青藏高原中西部航磁异常的匹配滤波分析及其构造启示[J].地球物理学报,2007,50(4):1131-1140.HE Ri-zheng,GAO Rui,ZHENG Hong-wei,et al.Match-filter analyzing areomagnetic anomaly in mid-western Tibetan Plateau and its tectonic implications[J].Chinese Journal Geophysics,2007,50(4):1131-1140.
[18]高锐,孟令顺,李莉.青藏高原亚东—格尔木条带布格重力异常数字图像处理与地壳现代构造[J].中国地质科学院院报,1990,21:163-174.GAO Rui,MENG Ling-shun,LI Li.Digital imageprocess for trip gravity anomalies along Yadong-Golmud in Tibet plateau and present crustal structure[J].Bulletin of The Chinese Academy of GeologicalSciences,1990,21:163-174.
[19]孟令顺,高锐,周富祥,等.利用重力异常研究亚东—格尔木地壳构造[J].中国地质科学院院报,1990,21:149-161.MENG Ling-sun,GAO Rui,ZHOU Fu-xiang,et al.Intepretation of the crustal structure in Yadong-Gol-mud area using gravity anomalies[J].Bulletin of TheChinese Academy of Geological Sciences,1990,21:149-161.
[20]贺日政,高锐,郑洪伟.青藏高原南北向裂谷区深部构造的空间展布特征——来自青藏高原布格重力异常的小波分析结果[C]//中国大陆地球深部结构与动力学研究.北京:科学出版社,2004:743-751.HE Ri-zheng,GAO Rui,ZHENG Hong-wei.Distri-bution characteristics for deep structure in N-S tren-ding rifts area of Tibetan Plateau—from wavelet ana-lyse result of Tibetan Bouguar gravity anomaly[C]//Deep structure under Chinese mainland and geody-namics research.Beijing:Science Press,2004:743-751.
[21]孔祥儒,王谦身,熊绍柏.西藏高原西部综合地球物理与岩石圈结构的研究[J].中国科学(D辑),1996,26(4):308-315.KONG Xiang-ru,WANG Qian-shen,XIONG Shao-bai.The study of comprehensive geophysical profileand lithosphere structure in west Tibet[J].ChineseScience(Seris D),1996,26(4):308-315.
[22]Armijo R.Auaternary extension in southern Tibet:field observations and tectonic implication[J].Jour-nal of Geophysical Research,1986,91:13803-13872.
[23]郑斯华.西藏高原及其周围地区地震的地震矩张量及震源参数的尺度关系[J].地震学报,1992,14(4):423-434.ZHENG Si-hua.Size relationship between focal ten-sor and focal parameters in Xizang plateau and its sur-roundings[J].Acta Seismologica Sinica,1992,14(4):423-434.
[24]Sandvol E,Ni J,Kind R,et al.Seismic anisotropybeneath the southern Himalayas-Tibet collision zone[J].Journal of Geophysical Research,1997,102:17813-17824.
①潘桂棠.青藏高原区域地质调查成果展望.中国地质科学院学术报告,2005-01-08.
[2]Willett S D,Beaumont C.Subduction of Asian lithos-pheric mantle beneath Tibet inferred from models ofcontinental collision[J].Nature,1994,369:642-645.
[3]Armijo R,Tapponnier P,Han T.Late Cenozoic right-lateral strike-slip faulting across southern Tibet[J].Journal of Geophysical Research,1989,94:2787-2838.
[4]Molnar P,Chen W P.Focal depth and fault plane so-lution of earthquakes under the Tibet Plateau[J].Journal of Geophysical Research,1983,88:1180-1192.
[5]Tapponnier P,Mercier J L,Armijio R P,et al.Fieldevidence for active normal fault in Tibet[J].Nature,1981,294:410-414.
[6]肖序常,李廷栋.青藏高原的构造演化与隆升机制[M].广州:广东科技出版社,2000.XIAO Xu-chang,LI Ting-dong.Tectonic evolutionand uplift of Qinghai-Xizang(Tibet)plateau[M].Guangzhou:Guangdong Science&Technology Press,2000.
[7]张培震,王琪.中国大陆现今地壳运动和构造变形-速度场与活动地块[C]//青藏高原岩石圈现今变动与动力学.北京:地震出版社,2001:21-35.ZHANG Pei-zhen,WANG Qi.Presend-day crustalmovement and tectonic deformation in continental Chi-na GPS velocity field and active tectonic blocks[C]//Study on the recent deformation and dynamics of thelithosphere of Qinghai-Xizang Plateau.Beijing:Seis-mological Publishing House,2001:21-35.
[8]何顺东,丁林,吴根耀,等.藏南格仁错地区孜桂错断裂的第四纪活动及其构造意义[J].地质科学,2002,37(1):8-12.HE Shun-dong,DING Lin,WU Gen-yao,et al.Qua-ternary activity of Ziguicuo fault in Gayringco area,south Xizang,and its tectonic implications[J].ChineseJournal of Geology,2002,37(1):8-12.
[9]尹安.喜马拉雅—青藏高原造山带地质演化——显生宙亚洲大陆生长[J].地球学报,2001,22(3):193-230.YIN An.Geologic evolution of the Himalayan-Tibtanorogen—Phanerozoic growth of Aisa continetal[J].Acta Geoscientia Sinica,2001,22(3):193-230.
[10]Taylor M,Yin A,Ryerson F J,et al.Conjugatestrike-slip faulting along the Bangong-Nujiang su-ture zone accommodates coeval east-west extensionand north-south shortening in the interior of the Ti-betan Plateau[J].Tectonics,2003,22(4):1044.
[11]Lin A,Fu B,Guo J,et al.Co-seismic strike-slipand rupture length produced by the 2001MS8.1 Cen-tral Kunlun earthquake[J].Science,2002,296:2015-2017.
[12]贺日政.青藏高原近南北向裂谷的岩石圈结构及其动力学过程[D].北京:中国地质科学院,2003.HE Ri-zheng.Lithospheric structure of near north-south striking rifts in Tibet Plateau and its geody-namical process[D].Beijing:Chinese Academy Geo-logical Sciences,2003.
[13]Meade B J.Present-day kinematics at the India-Asiacollision zone[J].Geology,2007,35(1):81-84.
[14]杨华,梁月明,王岚,等.青藏高原东部航磁特征及其与构造成矿带的关系[M].北京:地质出版社,1991.YANG Hua,LIANG Yue-ming,WANG Lan,et al.Aeromagnetic character in eastern Tibetan plateauand its relationship with strcutral minarel belt[M].Beijing:Geological Publishing House,1991.
[15]熊盛青,周伏洪,姚正煦,等.青藏高原中西部航磁调查[M].北京:地质出版社,2001.XIONG Sheng-qing,ZHOU Fu-hong,YAO Zheng-xu,et al.Areomagnetic survey in central and westernQinghai-Tibet plateau[M].Beijing:Geological Pub-lishing House,2001.
[16]余钦范,楼海,孙运生,等.亚东—格尔木地学断面区域磁异常数据处理与地体划分[J].中国地质科学院院报,1990,21:174-182.YU Qin-fan,LOU Hai,SUN Yun-sheng,et al.An-alysing regional magnetic anomaly data along geosci-ence transect from Yadong to Golmud and terrane di-visions[J].Bulletin of The Chinese Academy of Geo-logical Sciences,1990,21:174-182.
[17]贺日政,高锐,郑洪伟,等.青藏高原中西部航磁异常的匹配滤波分析及其构造启示[J].地球物理学报,2007,50(4):1131-1140.HE Ri-zheng,GAO Rui,ZHENG Hong-wei,et al.Match-filter analyzing areomagnetic anomaly in mid-western Tibetan Plateau and its tectonic implications[J].Chinese Journal Geophysics,2007,50(4):1131-1140.
[18]高锐,孟令顺,李莉.青藏高原亚东—格尔木条带布格重力异常数字图像处理与地壳现代构造[J].中国地质科学院院报,1990,21:163-174.GAO Rui,MENG Ling-shun,LI Li.Digital imageprocess for trip gravity anomalies along Yadong-Golmud in Tibet plateau and present crustal structure[J].Bulletin of The Chinese Academy of GeologicalSciences,1990,21:163-174.
[19]孟令顺,高锐,周富祥,等.利用重力异常研究亚东—格尔木地壳构造[J].中国地质科学院院报,1990,21:149-161.MENG Ling-sun,GAO Rui,ZHOU Fu-xiang,et al.Intepretation of the crustal structure in Yadong-Gol-mud area using gravity anomalies[J].Bulletin of TheChinese Academy of Geological Sciences,1990,21:149-161.
[20]贺日政,高锐,郑洪伟.青藏高原南北向裂谷区深部构造的空间展布特征——来自青藏高原布格重力异常的小波分析结果[C]//中国大陆地球深部结构与动力学研究.北京:科学出版社,2004:743-751.HE Ri-zheng,GAO Rui,ZHENG Hong-wei.Distri-bution characteristics for deep structure in N-S tren-ding rifts area of Tibetan Plateau—from wavelet ana-lyse result of Tibetan Bouguar gravity anomaly[C]//Deep structure under Chinese mainland and geody-namics research.Beijing:Science Press,2004:743-751.
[21]孔祥儒,王谦身,熊绍柏.西藏高原西部综合地球物理与岩石圈结构的研究[J].中国科学(D辑),1996,26(4):308-315.KONG Xiang-ru,WANG Qian-shen,XIONG Shao-bai.The study of comprehensive geophysical profileand lithosphere structure in west Tibet[J].ChineseScience(Seris D),1996,26(4):308-315.
[22]Armijo R.Auaternary extension in southern Tibet:field observations and tectonic implication[J].Jour-nal of Geophysical Research,1986,91:13803-13872.
[23]郑斯华.西藏高原及其周围地区地震的地震矩张量及震源参数的尺度关系[J].地震学报,1992,14(4):423-434.ZHENG Si-hua.Size relationship between focal ten-sor and focal parameters in Xizang plateau and its sur-roundings[J].Acta Seismologica Sinica,1992,14(4):423-434.
[24]Sandvol E,Ni J,Kind R,et al.Seismic anisotropybeneath the southern Himalayas-Tibet collision zone[J].Journal of Geophysical Research,1997,102:17813-17824.
①潘桂棠.青藏高原区域地质调查成果展望.中国地质科学院学术报告,2005-01-08.
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