龙门山深部结构的三维视密度成像技术解析
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摘要
为描述和解析龙门山深部地质构造特征,结合模型试算和效果分析,利用一种基于多空间异常分离的三维快速视密度反演成像技术,处理并得到了龙门山地区多空间多尺度源的视密度分布。视密度成像结果表明:松潘-甘孜地块地壳低密度物质流在向东推进时,受到扬子地块冷硬高密度物质的阻挡,导致沿龙门山形成高密度老变质基底物质逆冲倒转的推覆体弧形构造,中下地壳伴有大规模低密度中酸性热岩浆活动。这种三维空间密度信息的物质展布特征,在展示深浅部构造的差异性与继承性特征的同时,也较好地刻画了龙门山不同深度区域构造边界,为深入研究该地区地壳结构、深部构造演化、地震孕育动力等方面提供了依据。
Deep geological tectonic features of the Longmen mountains were described using a fast 3Dapparent density imaging technology.This technology,based on multiple spatial anomaly separation with model test and effect analysis,was applied to the Longmen mountains area to obtain lateral apparent density distributions corresponding to sources of multiple scales.Results of apparent density imaging show that crustal low-density material flow of the Songpan-Ganzi fold belt is moving eastward,and it is blocked by cold high-density material of the Yangtze plate.High density,old metamorphic basement material thrust nappe arc structures along the Longmen mountains,with massive low density acidic hot magma activity between middle and lower crusts.The material distribution characteristics of 3Dspace density information shows differences and inheritance characteristics between deep and shallow structures,delineating structural boundaries of Longmen mountains in different depths,which could provide some insights for research of deep structure evolution,seismogenic mechanism,and crustal structure in this area.
Deep geological tectonic features of the Longmen mountains were described using a fast 3Dapparent density imaging technology.This technology,based on multiple spatial anomaly separation with model test and effect analysis,was applied to the Longmen mountains area to obtain lateral apparent density distributions corresponding to sources of multiple scales.Results of apparent density imaging show that crustal low-density material flow of the Songpan-Ganzi fold belt is moving eastward,and it is blocked by cold high-density material of the Yangtze plate.High density,old metamorphic basement material thrust nappe arc structures along the Longmen mountains,with massive low density acidic hot magma activity between middle and lower crusts.The material distribution characteristics of 3Dspace density information shows differences and inheritance characteristics between deep and shallow structures,delineating structural boundaries of Longmen mountains in different depths,which could provide some insights for research of deep structure evolution,seismogenic mechanism,and crustal structure in this area.
引文
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[8]李立,金国元.攀西裂谷带及龙门山断裂带地壳上地幔的大地电磁测深研究[J].物探与化探,1987,11(3):161-169.Li Li,Jin Guoyuan.Telluric electromagnetic sounding study of crust and upper mantle in the Panxi“Rift zone”and the Longmenshan faulted zone[J].Geophysical&Geochemical Exploration,1987,11(3):161-169.(in Chinese)
[9]王帅成,王多义,程建,等.广元地区龙门山前缘中低温对流型地热系统分析[J].物探化探计算技术,2010,32(5):542-546.Wang Shuaicheng,Wang Duoyi,Cheng Jian,et al.Low-medium temperature geothermal system of convective type in front of longmen mountains in Guangyuanarea[J].Computing Techniques for Geophysical and Geochemical Exploration,2010,32(5):542-546.(in Chinese)
[10]程方道,刘东甲,姚汝信.划分重力区域场与局部场的研究[J].物化探计算技术,1987,9(1):1-9.Cheng Fangdao,Liu Dongjia,Yao Ruxin.A study on the identification of regional and local gravity fields[J].Computing Techniques for Geophysical and Geochemical Exploration,1987,9(1):1-9.(in Chinese)
[11]文百红,程方道.用于划分磁异常的新方法--插值切割法[J].中南矿冶学院学报.1990,21(3):229-235.Wen Baihong,Cheng Fangdao.A new interpolating cut method for identifying regional and local fields of magnetic anomaly[J].Journal of Central–South Institute of Mining and Metallurgy,1990,21(3):229-235.(in Chinese)
[12]杨金玉,徐世浙,余海龙,等.视密度反演在东海及邻区重力异常解释中的应用[J].地球物理学报,2008,51(6):1909-1916.Yang Jinyu,Xu Shizhe,Yu Hailong,et al.Application of apparent density inversion method in the East China Sea and its adjacent area[J].Chinese Journal of Geophysics,2008,51(6):1909-1916.(in Chinese)
[13]段本春,徐世浙,阎汉杰,等.划分磁异常场的插值切割法在研究火成岩体分布中的应用[J].石油地球物理勘探,1998,33(11):125-131.Duan Benchun,Xu Shizhe,Yan Hanjie,et al.Application of interpolation-cut method for magnetic anomaly division to igneous mass investigation[J].OIL Geophysical Prospecting,1998,33(l):125-131.(in Chinese)
[14]徐世浙.迭代法与FFT法位场向下延拓效果的比较[J].地球物理学报,2007,50(1):285-289.Xu Shizhe.A comparison of effects between the iteration method and FFT for downward continuation of potential fields[J].Chinese Journal of Geophysics,2007,50(1):285-289.(in Chinese)
[15]徐世浙.位场延拓的积分-迭代法[J].地球物理学报,2006,49(4):1176-1182.Xu Shizhe.The integral-iteration method for continuation of potential fields[J].Chinese Journal of Geophysics,2006,49(4):1176-1182.(in Chinese)
[16]徐世浙,余海龙,李海侠,等.基于位场分离与延拓的视密度反演[J].地球物理学报,2009,52(6):1592-1598.Xu Shizhe,Xu Hailong,Li Haixia,et al.The inversion of apparent density based on the separation and continuation of potential field[J].Chinese Journal of Geophysics,2009,52(6):1592-1598.(in Chinese)
[17]余海龙.位场异常三维视物性快速反演[D].杭州:浙江大学,2009.Yu Hailong.The Rapid Inversion of 3D Apparent Physical Properties for Potential Field Anomalies[D].Hangzhou:Zhejiang University,2009.(in Chinese)
[18]袁海华,张志兰,张平.龙门山老君沟花岗岩的隆升及冷却史[J].成都地质学院学报,1991,18(1):20-25.Yuan Haihua,Zhang Zhilan,Zhang Ping.The uplifting and cooling histories of Laojunggou granite in the western margin of the central section mountain[J].Journal of Chengdu college of geology,1991,18(1):20-25.(in Chinese)
[2]管志宁,张昌达,陈方道,等.磁法勘探重要问题理论分析与应用[M].北京:地质出版社,1993.Guan Zhining,Zhang Changda,Chen Fangdao,et al.The Academic Analysis and Application of Key in the Magnetic Reconnoiter[M].Beijing:Geological Publishing House,1993.(in Chinese)
[3]Nabighian M N,Graueh V J S,Hansen R O,et al.The historical development of the gravity method in exploration[J].Geophysies,2005,70(6):33ND-61ND.
[4]曾华霖.重磁勘探反演问题研究评述[J].物探与化探,1990,14(3):182-190.Zeng Hualin.The inversed problem in gravity and magnetic exploration:a review[J].Geophysical&Geochemical Exploration,1990,14(3):182-190.(in Chinese)
[5]陈学波,赵静娴,李金森,等.长江三峡及邻区地壳上地幔结构特征及其在区域构造中的意义[C]//中国地球物理学会.1995年中国地球物理学会第十一届学术年会论文集.湖北:江汉石油学院,1995:64.Chen Xuebo,Zhao Jingxian,Li Jinsen,et al.Structure characteristics of crust and upper mantle in the three gorges of Yangtze river and its adjacent areas and its significance in regional structure[C]//Chinese Geophysical Society.Chinese Geophysical Society Eleventh Annual Conference in 1995.Hubei:Jianghan Petroleum University,1995:64.(in Chinese)
[6]王绪本,朱迎堂,赵锡奎,等.青藏高原东缘龙门山逆冲构造深部电性结构特征[J].地球物理学报,2009,52(2):564-571.Wang Xuben,Zhu Yingtang,Zhao Xikui,et al.Deep conductivity characteristics of the Longmen Shan,eastern Qinghai-Tibet plateau[J].Chinese Journal of Geophysics,2009,52(2):564-571.(in Chinese)
[7]宋鸿彪,刘树根.龙门山中北段重磁场特征与深部构造的关系[J].成都地质学院学报,1991,18(1):74-82.Song Hongbiao,Liu Shugen.The relation of gravity and aeromagnetic field and deep structure in middlenorthern Longmenshan mountains[J].Journal of Chengdu College of Geology,1991,18(1):74-82.(in Chinese)
[8]李立,金国元.攀西裂谷带及龙门山断裂带地壳上地幔的大地电磁测深研究[J].物探与化探,1987,11(3):161-169.Li Li,Jin Guoyuan.Telluric electromagnetic sounding study of crust and upper mantle in the Panxi“Rift zone”and the Longmenshan faulted zone[J].Geophysical&Geochemical Exploration,1987,11(3):161-169.(in Chinese)
[9]王帅成,王多义,程建,等.广元地区龙门山前缘中低温对流型地热系统分析[J].物探化探计算技术,2010,32(5):542-546.Wang Shuaicheng,Wang Duoyi,Cheng Jian,et al.Low-medium temperature geothermal system of convective type in front of longmen mountains in Guangyuanarea[J].Computing Techniques for Geophysical and Geochemical Exploration,2010,32(5):542-546.(in Chinese)
[10]程方道,刘东甲,姚汝信.划分重力区域场与局部场的研究[J].物化探计算技术,1987,9(1):1-9.Cheng Fangdao,Liu Dongjia,Yao Ruxin.A study on the identification of regional and local gravity fields[J].Computing Techniques for Geophysical and Geochemical Exploration,1987,9(1):1-9.(in Chinese)
[11]文百红,程方道.用于划分磁异常的新方法--插值切割法[J].中南矿冶学院学报.1990,21(3):229-235.Wen Baihong,Cheng Fangdao.A new interpolating cut method for identifying regional and local fields of magnetic anomaly[J].Journal of Central–South Institute of Mining and Metallurgy,1990,21(3):229-235.(in Chinese)
[12]杨金玉,徐世浙,余海龙,等.视密度反演在东海及邻区重力异常解释中的应用[J].地球物理学报,2008,51(6):1909-1916.Yang Jinyu,Xu Shizhe,Yu Hailong,et al.Application of apparent density inversion method in the East China Sea and its adjacent area[J].Chinese Journal of Geophysics,2008,51(6):1909-1916.(in Chinese)
[13]段本春,徐世浙,阎汉杰,等.划分磁异常场的插值切割法在研究火成岩体分布中的应用[J].石油地球物理勘探,1998,33(11):125-131.Duan Benchun,Xu Shizhe,Yan Hanjie,et al.Application of interpolation-cut method for magnetic anomaly division to igneous mass investigation[J].OIL Geophysical Prospecting,1998,33(l):125-131.(in Chinese)
[14]徐世浙.迭代法与FFT法位场向下延拓效果的比较[J].地球物理学报,2007,50(1):285-289.Xu Shizhe.A comparison of effects between the iteration method and FFT for downward continuation of potential fields[J].Chinese Journal of Geophysics,2007,50(1):285-289.(in Chinese)
[15]徐世浙.位场延拓的积分-迭代法[J].地球物理学报,2006,49(4):1176-1182.Xu Shizhe.The integral-iteration method for continuation of potential fields[J].Chinese Journal of Geophysics,2006,49(4):1176-1182.(in Chinese)
[16]徐世浙,余海龙,李海侠,等.基于位场分离与延拓的视密度反演[J].地球物理学报,2009,52(6):1592-1598.Xu Shizhe,Xu Hailong,Li Haixia,et al.The inversion of apparent density based on the separation and continuation of potential field[J].Chinese Journal of Geophysics,2009,52(6):1592-1598.(in Chinese)
[17]余海龙.位场异常三维视物性快速反演[D].杭州:浙江大学,2009.Yu Hailong.The Rapid Inversion of 3D Apparent Physical Properties for Potential Field Anomalies[D].Hangzhou:Zhejiang University,2009.(in Chinese)
[18]袁海华,张志兰,张平.龙门山老君沟花岗岩的隆升及冷却史[J].成都地质学院学报,1991,18(1):20-25.Yuan Haihua,Zhang Zhilan,Zhang Ping.The uplifting and cooling histories of Laojunggou granite in the western margin of the central section mountain[J].Journal of Chengdu college of geology,1991,18(1):20-25.(in Chinese)
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