中国中南地区综合地质地球物理研究
|
摘要
利用重、磁和天然地震资料对中南地区进行了综合地质地球物理研究.根据研究区的重、磁异常的分布特征,可将其分为4个重力异常区、3个航磁异常区.根据重力资料反演计算得到的研究区的地壳厚度在29.5-41 km之间,总的趋势为西厚东薄,地壳厚度与地形起伏基本上呈镜像关系.根据磁力资料计算得到的研究区居里界面在12-40 km之间变化.地震层析成像结果表明研究区内的速度分布总体上体现了纵横交错的断块特征.在纵向尺度上,江汉-洞庭盆地以及周缘造山带的上地壳结构变化不大,中地壳和下地壳则普遍受到现今构造活动的改造,以致岩石的结构发生了一定的变化.它们主要表现为低速区域的扩大,尤其是在地壳下部尤为突出,这与断陷盆地的拉张以及造山带岩石层的底侵和拆沉作用密切相关.通过对研究区地球物理场的分析计算,在研究区共提取主要断裂带34条.根据岩石层板块大地构造理论,依据岩石层结构、地壳结构和结晶基底等深部结构的不同,将研究区中板内不同构造单元——块体作为一级构造单元,块体之间的深大断裂带作为块体的边界——块体结合带,据此原则在研究区中划分出两个一级构造单元,五个二级构造单元.
We use gravity,magnetic,and earthquake data to carry out a comprehensive geological and geophysical study in the middle southern region of China.According to the distribution of gravity and magnetic anomalies,four gravity anomalous zones and three magnetic anomalous zones are identified.According to calculations of gravity data,the crustal thickness ranges between 29.5 and 41 km with a general trend of being thick in the west and thin in the east.There is a mirror image relationship between crust thickness and terrain relief.According to magnetic data,the depth of Curie interface ranges between 12 and 40 km in the study area.The crust of study region is divided into four layers by velocity interfaces at 3,13,23km and 36km,and below the crust two velocity interfaces at 71km and 120km are adopted in seismic tomographic study.Tomographic imaging result indicates that velocity distribution generally reflects the characteristics of crossed fault blocks.Longitudinally,the upper crust structure in Jianghan-Dongting basins and their marginal orogenic belts does not change much,the middle and lower crust were generally transformed by modern tectonic activities,leading to certain changes in lithospheric structure.Their main presentation is the enlargement of low velocity areas,it is particularly so in the lower part of the crust.This is closely related to the tension of depressive basins and lithospheric intrusion in orogenic belt.Analysis and calculations of geophysical fields reveal 34 principal fault zones in the study area.According to geotectonic theory of lithospheric plate,as well as the variations of deep-seated structures of lithosphere,crustal structure and crystalline basement,the different tectonic units-massives in the study area can be taken as primary tectonic units.The deep grand fault zones between them can be taken as boundary contact zones.In light of this principle,two primary tectonic units and five secondary tectonic units are identified.
We use gravity,magnetic,and earthquake data to carry out a comprehensive geological and geophysical study in the middle southern region of China.According to the distribution of gravity and magnetic anomalies,four gravity anomalous zones and three magnetic anomalous zones are identified.According to calculations of gravity data,the crustal thickness ranges between 29.5 and 41 km with a general trend of being thick in the west and thin in the east.There is a mirror image relationship between crust thickness and terrain relief.According to magnetic data,the depth of Curie interface ranges between 12 and 40 km in the study area.The crust of study region is divided into four layers by velocity interfaces at 3,13,23km and 36km,and below the crust two velocity interfaces at 71km and 120km are adopted in seismic tomographic study.Tomographic imaging result indicates that velocity distribution generally reflects the characteristics of crossed fault blocks.Longitudinally,the upper crust structure in Jianghan-Dongting basins and their marginal orogenic belts does not change much,the middle and lower crust were generally transformed by modern tectonic activities,leading to certain changes in lithospheric structure.Their main presentation is the enlargement of low velocity areas,it is particularly so in the lower part of the crust.This is closely related to the tension of depressive basins and lithospheric intrusion in orogenic belt.Analysis and calculations of geophysical fields reveal 34 principal fault zones in the study area.According to geotectonic theory of lithospheric plate,as well as the variations of deep-seated structures of lithosphere,crustal structure and crystalline basement,the different tectonic units-massives in the study area can be taken as primary tectonic units.The deep grand fault zones between them can be taken as boundary contact zones.In light of this principle,two primary tectonic units and five secondary tectonic units are identified.
引文
[1]刘光鼎,郝天珧,刘伊克.中国大地构造宏观格架及其矿产资源的关系.科学通报,1997,42(2):113-118Liu G D,Hao T Y,Liu Y K.Tectonic framework of China and itsrelation with mineral resources.Chinese Science Bulletin(in Chinese),1997,42(2):113-118
[2]刘光鼎,郝天珧.中国的地质环境与隐伏矿床.地球物理学报,1998,41(2):182-188Liu G D,Hao T Y.Geological environment and hidden mineraldeposits in China.Chinese J.Geophys.(in Chinese),1998,41(2):182-188
[3]江汉油田石油地质编写组.江汉油田.中国石油地质志.卷9.北京:石油工业出版社,1991Compilation Group of Petroleum Geology of Jianghan Oil Field.Jianghan Oil Field.Records of China’s Petroleum Geology.Vol.9(in Chinese).Beijing:Petroleum Industrial Press,1991
[4]四川油气区石油地质编写组.四川油气区.中国石油地质志.卷10.北京:石油工业出版社,1989Compilation Group of Petroleum Geology of Sichuan Oil and GasArea.Oil and Gas Area in Sichuan.Records of China’s PetroleumGeology.Vol.10(in Chinese).Beijing:Petroleum Industrial Press,1989
[5]湖北省地质矿产局.湖北省区域地质志.区域地质.第20号.北京:地质出版社,1990Hubei Provincial Bureau of Geology and Minerals.Records ofRegional Geology of Hubei Province.Regional Geology.No.20(inChinese).Beijing:Geological Publishing House,1990
[6]四川省地质矿产局.四川省区域地质志.区域地质.第23号.北京:地质出版社,1991Sichuan Provincial Bureau of Geology and Minerals.Records ofRegional Geology of Sichuan Province,Regional Geology.No.23(inChinese).Beijing:Geological Publishing House,1991
[7]湖南省地质矿产局.湖南省区域地质志.区域地质.第8号.北京:地质出版社,1988Hunan Provincial Bureau of Geology and Minerals.Records ofRegional Geology of Hunan Province.Regional Geology.No.8(inChinese).Beijing:Geological Publishing House,1988
[8]江西省地质矿产局.江西省区域地质志.区域地质.第2号.北京:地质出版社,1984Jiangxi Provincial Bureau of Geology and Minerals.Records ofRegional Geology of Jiangxi Province.Regional Geology.No.2(inChinese).Beijing:Geological Publishing House,1984
[9]江为为.调和级数法与重力资料反演地壳结构.中国科学技术大学研究生院学报,1989,6(1):96-104Jiang W W.The harmonious series and gravitational data used toinverse crustal structure.J.of Graduate School,USTC(inChinese),1989,6(1):96-104
[10]张明华.重磁数据处理新方法研究及其在华北地台北缘地区的应用[博士学位论文].北京:中国地质大学,1995Zhang M H.Researches on new methods of gravity and magnetic dataprocessing and their applications in the northern area of north Chinaplatform[Ph.D.thesis](in Chinese).Beijing:China University ofGeosciences,1995
[11]刘福田,曲克信,吴华等.中国大陆及其邻近地区的地震层析成像.地球物理学报,1989,32(3):281-291Liu F T,Qu K X,Wu H,et al.Seismic tomography of the Chinesecontinent and adjacent region.Chinese J.Geophys.(ActaGeophysica Sinica)(in Chinese),1989,32(3):281-291
[12]刘福田,曲克信,吴华等.华北地区的地震层面成像.地球物理学报,1986,29(5):442-449Liu F T,Qu K X,Wu H,et al.Seismic tomography of North Chinaregion.Chinese J.Geophys.(Acta Geophysica Sinica)(in Chinese),1986,29(5):442-449
[13]曹家敏,朱介寿,吴德超.东秦岭地区的地壳速度结构.成都理工学院院报,1994,21(1):11-17Cao J M,Zhu J S,Wu D C.Crustal velocity structure in easternQinling region.Journal of Chengdu College of Science andEngineering(in Chinese),1994,21(1):11-17,
[14]刘建华,刘福田,孙若昧等.秦岭-大别造山带及其南北缘地震层析成像.地球物理学报,1995,38(1):46-54Liu J H,Liu F T,Sun R M et al.Seismic tomography beneath theQinling-Dabie orogenic belt and both the northern and southernfringes.Chinese J.Geophys.(Acta Geophysica Sinica)(inChinese),1995,38(1):46-54
[15]刘建华,吴华,刘福田.华南及其海域三维速度分布特征与岩石层结构.地球物理学报,1996,39(4):483-492Liu J H,Wu H,Liu F T.Features of 3-D velocity distribution andlithosphere structure in South China and its contigous sea area.Chinese J.Geophys.(Acta Geophysica Sinica)(in Chinese),1996,39(4):483-492
[16]胥颐.中国大陆中西部地区的地震层析成像及其地壳上地幔结构.中国科学院地质与地球物理研究所博士后研究工作报告.北京:中国科学院地质与地理物理研究所,2001Xu Y.Tomographic image of central-western part of Chinesecontinent and its crustal and upper mantle structure.Post-DoctoralResearch Report of the Institute of Geology and Geophysics(inChinese),CAS,2001
[17]曾融生,孙为国,毛桐恩等.中国大陆莫霍界面深度图.地震学报,1995,17(3):322-327Zeng R S,Sun W G,Mao T E.et al.Moho interface depth map ofChinese continent.Acta Seismologica Sinica(in Chinese),1995,17(3):322-327
[18]Kennett B L N,Engdahl E R.Travel times for global earthquakelocation and phase identification.Geophy.J.Int.,1991,105(2):429-465
[19]王椿镛,张先康,陈步云等.大别造山带的地壳结构研究.中国科学(D辑),1997,27:221-226Wang C Y,Zhang X K,Chen B Y,et al.A study of crustalstructure of Dabie orogenic belt.Science in China(Series D)(inChinese),1997,27:221-226
[20]王椿镛,丁志峰,宋建立等.大别造山带地壳S波速度结构.地球物理学报,1997,40(3):337-346Wang C Y,Ding Z F,Song J L,et al.Shear wave velocity structurein Dabieshan orogenic belte.Chinese J.Geophys.(in Chinese),1997,40(3):337-346
[21]刘和莆,梁慧社,李晓清等.中国东部中新生代盆地裂陷与伸展山岭耦合机制.地学前缘,2000,7(4):477-486Liu H P,Liang H S,Li X Q,et al.The coupling mechanisms ofMesozoic-Cenozoic rift basins and extensional mountain system ineastern China.Earth Science Frontiers(in Chinese),2000,7(4):477-486
[2]刘光鼎,郝天珧.中国的地质环境与隐伏矿床.地球物理学报,1998,41(2):182-188Liu G D,Hao T Y.Geological environment and hidden mineraldeposits in China.Chinese J.Geophys.(in Chinese),1998,41(2):182-188
[3]江汉油田石油地质编写组.江汉油田.中国石油地质志.卷9.北京:石油工业出版社,1991Compilation Group of Petroleum Geology of Jianghan Oil Field.Jianghan Oil Field.Records of China’s Petroleum Geology.Vol.9(in Chinese).Beijing:Petroleum Industrial Press,1991
[4]四川油气区石油地质编写组.四川油气区.中国石油地质志.卷10.北京:石油工业出版社,1989Compilation Group of Petroleum Geology of Sichuan Oil and GasArea.Oil and Gas Area in Sichuan.Records of China’s PetroleumGeology.Vol.10(in Chinese).Beijing:Petroleum Industrial Press,1989
[5]湖北省地质矿产局.湖北省区域地质志.区域地质.第20号.北京:地质出版社,1990Hubei Provincial Bureau of Geology and Minerals.Records ofRegional Geology of Hubei Province.Regional Geology.No.20(inChinese).Beijing:Geological Publishing House,1990
[6]四川省地质矿产局.四川省区域地质志.区域地质.第23号.北京:地质出版社,1991Sichuan Provincial Bureau of Geology and Minerals.Records ofRegional Geology of Sichuan Province,Regional Geology.No.23(inChinese).Beijing:Geological Publishing House,1991
[7]湖南省地质矿产局.湖南省区域地质志.区域地质.第8号.北京:地质出版社,1988Hunan Provincial Bureau of Geology and Minerals.Records ofRegional Geology of Hunan Province.Regional Geology.No.8(inChinese).Beijing:Geological Publishing House,1988
[8]江西省地质矿产局.江西省区域地质志.区域地质.第2号.北京:地质出版社,1984Jiangxi Provincial Bureau of Geology and Minerals.Records ofRegional Geology of Jiangxi Province.Regional Geology.No.2(inChinese).Beijing:Geological Publishing House,1984
[9]江为为.调和级数法与重力资料反演地壳结构.中国科学技术大学研究生院学报,1989,6(1):96-104Jiang W W.The harmonious series and gravitational data used toinverse crustal structure.J.of Graduate School,USTC(inChinese),1989,6(1):96-104
[10]张明华.重磁数据处理新方法研究及其在华北地台北缘地区的应用[博士学位论文].北京:中国地质大学,1995Zhang M H.Researches on new methods of gravity and magnetic dataprocessing and their applications in the northern area of north Chinaplatform[Ph.D.thesis](in Chinese).Beijing:China University ofGeosciences,1995
[11]刘福田,曲克信,吴华等.中国大陆及其邻近地区的地震层析成像.地球物理学报,1989,32(3):281-291Liu F T,Qu K X,Wu H,et al.Seismic tomography of the Chinesecontinent and adjacent region.Chinese J.Geophys.(ActaGeophysica Sinica)(in Chinese),1989,32(3):281-291
[12]刘福田,曲克信,吴华等.华北地区的地震层面成像.地球物理学报,1986,29(5):442-449Liu F T,Qu K X,Wu H,et al.Seismic tomography of North Chinaregion.Chinese J.Geophys.(Acta Geophysica Sinica)(in Chinese),1986,29(5):442-449
[13]曹家敏,朱介寿,吴德超.东秦岭地区的地壳速度结构.成都理工学院院报,1994,21(1):11-17Cao J M,Zhu J S,Wu D C.Crustal velocity structure in easternQinling region.Journal of Chengdu College of Science andEngineering(in Chinese),1994,21(1):11-17,
[14]刘建华,刘福田,孙若昧等.秦岭-大别造山带及其南北缘地震层析成像.地球物理学报,1995,38(1):46-54Liu J H,Liu F T,Sun R M et al.Seismic tomography beneath theQinling-Dabie orogenic belt and both the northern and southernfringes.Chinese J.Geophys.(Acta Geophysica Sinica)(inChinese),1995,38(1):46-54
[15]刘建华,吴华,刘福田.华南及其海域三维速度分布特征与岩石层结构.地球物理学报,1996,39(4):483-492Liu J H,Wu H,Liu F T.Features of 3-D velocity distribution andlithosphere structure in South China and its contigous sea area.Chinese J.Geophys.(Acta Geophysica Sinica)(in Chinese),1996,39(4):483-492
[16]胥颐.中国大陆中西部地区的地震层析成像及其地壳上地幔结构.中国科学院地质与地球物理研究所博士后研究工作报告.北京:中国科学院地质与地理物理研究所,2001Xu Y.Tomographic image of central-western part of Chinesecontinent and its crustal and upper mantle structure.Post-DoctoralResearch Report of the Institute of Geology and Geophysics(inChinese),CAS,2001
[17]曾融生,孙为国,毛桐恩等.中国大陆莫霍界面深度图.地震学报,1995,17(3):322-327Zeng R S,Sun W G,Mao T E.et al.Moho interface depth map ofChinese continent.Acta Seismologica Sinica(in Chinese),1995,17(3):322-327
[18]Kennett B L N,Engdahl E R.Travel times for global earthquakelocation and phase identification.Geophy.J.Int.,1991,105(2):429-465
[19]王椿镛,张先康,陈步云等.大别造山带的地壳结构研究.中国科学(D辑),1997,27:221-226Wang C Y,Zhang X K,Chen B Y,et al.A study of crustalstructure of Dabie orogenic belt.Science in China(Series D)(inChinese),1997,27:221-226
[20]王椿镛,丁志峰,宋建立等.大别造山带地壳S波速度结构.地球物理学报,1997,40(3):337-346Wang C Y,Ding Z F,Song J L,et al.Shear wave velocity structurein Dabieshan orogenic belte.Chinese J.Geophys.(in Chinese),1997,40(3):337-346
[21]刘和莆,梁慧社,李晓清等.中国东部中新生代盆地裂陷与伸展山岭耦合机制.地学前缘,2000,7(4):477-486Liu H P,Liang H S,Li X Q,et al.The coupling mechanisms ofMesozoic-Cenozoic rift basins and extensional mountain system ineastern China.Earth Science Frontiers(in Chinese),2000,7(4):477-486
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