南海东北部陆缘基底磁异常反演与解释
|
摘要
在对南海东北部陆缘的磁场资料展开多尺度分析处理的基础上,结合中生代深度资料,反演求取了前中生代基底的视磁化强度分布.通过对现有综合钻井和地震等资料进行综合分析,论述了基底视磁化强度分布,推测研究区视磁化强度高值带北段可能受制于陆壳,而南段特高值则可能是受次洋壳的改造作用,研究区西部的视磁化强度低值区是一套古生代浅变质岩系,视磁化强度负值区的潮汕坳陷及其东南部基底具有洋壳或准洋壳性质.
Based on multi-scale processing and analysis of the magnetic data of northeast continental margin of the South China Sea,the apparent magnetization of pre-Mesozoic basement was calculated.Through comprehensive analysis of available drilling and seismic data,the distribution characteristics of apparent magnetization of the basement have been discussed.The northern portion of the high apparent magnetization belt may be subject to continental crust,and the southern portion with special high value may have been resulted from the reform of sub-oceanic crust.In the western study area with low apparent magnetization,there is a suit of Paleozoic epizonal metamorphism rock series.Chao-Shan depression and its southeast basement with negative apparent magnetization seem to be oceanic crust or quasi-oceanic crust by nature.
Based on multi-scale processing and analysis of the magnetic data of northeast continental margin of the South China Sea,the apparent magnetization of pre-Mesozoic basement was calculated.Through comprehensive analysis of available drilling and seismic data,the distribution characteristics of apparent magnetization of the basement have been discussed.The northern portion of the high apparent magnetization belt may be subject to continental crust,and the southern portion with special high value may have been resulted from the reform of sub-oceanic crust.In the western study area with low apparent magnetization,there is a suit of Paleozoic epizonal metamorphism rock series.Chao-Shan depression and its southeast basement with negative apparent magnetization seem to be oceanic crust or quasi-oceanic crust by nature.
引文
[1]郝沪军,张向涛.重磁资料在潮汕坳陷中生界油气勘探中的应用[J].中国海上油气,2003,17(2):128.HAO Hujun,ZHANG Xiangtao.An application of gravimetricand magnetic data in Mesozoic petroleum exploration inChaoshan depression,South China Sea[J].China Offshore Oiland Gas,2003,17(2):128.
[2]邵磊,尤洪庆,郝沪军,等.南海东北部中生界岩石学特征及沉积环境[J].地质评论,2007,53(2):164.SHAO Lei,YOU Hongqing,HAO Hujun,et al.Petrology anddepositional environments of Mesozoic strata in thenortheastern South China Sea[J].Geological Review,2007,53(2):164.
[3]王家林,张新兵,吴健生,等.珠江口盆地基底结构的综合地球物理研究[J].热带海洋学报,2002,21(2):13.WANG Jialin,ZHANG Xinbing,WU Jiansheng,et al.Integrated geophysical researches on base texture of PearlRiver mouth basin[J].Journal of Tropical Oceanography,2002,21(2):13.
[4]陈冰.南海东北部新生代沉积盆地基底的地球物理特征及其地质解释[D].上海:同济大学海洋与地球科学学院,2004.CHEN Bing.Geophysical features and geological interpretationof the sedimentary basin basement in the northeast area ofSouth China Sea[D].Shanghai:College of Ocean and EarthScience of Tongji University,2004.
[5]郝天珧,徐亚,赵百民,等.南海磁性基底分布特征的地球物理研究[J].地球物理学报,2009,52(11):2763.HAO Tianyao,XU Ya,ZHAO Baimin,et al.Geophysicalresearch on distribution features of magnetic basements in theSouth China Sea[J].Chinese Jouenal of Geophysics,2009,52(11):2763.
[6]胡登科,周蒂,吴湘杰,等.南海东北部高磁异常带成因的地球物理反演研究[J].热带海洋学报,2008,27(1):32.HU Dengke,ZHOU Di.Orgin of high magnetic anomaly belt innortheastern south china sea as indicated by geophysicalinversion[J].Journal of Tropical Oceanography,2008,27(1):32.
[7]Sweldens W.The lifting scheme:a construction of secondgeneration wavelets[J].Siam Journal on MathematicalAnalysis,1997,29(2):511.
[8]江凡.南海东北部中生界分布综合地球物理研究[D].上海:同济大学海洋与地球科学学院,2010.JIANG Fan.Integrated geophysical study of Mesozoicdistribution on northeastern continental margin of the SouthChina Sea[D].Shanghai:College of Ocean and Earth Science ofTongji University,2010.
[9]王述功,高仰.南海海盆磁异常理论剖面的计算和磁条带的初步分析[J].海洋科学,1990,11(6):9.WANG Shugong,GAO Yang.Calculation on theoretical profilesof magnetic anomalies and preliminary analyses on magneticlineation in south china sea basin[J].Marine Sciences,1990,11(6):9.
[10]姚伯初,万玲,曾维军,等.中国南海海域岩石圈三维结构及演化[M].北京:地质出版社,2006.YAO Baichu,WAN Ling,ZENG Weijun,et al.The three-dimensional structure of lithosphere and its evolution in theSouth China Sea[M].Beijing:Geology Press,2006.
[2]邵磊,尤洪庆,郝沪军,等.南海东北部中生界岩石学特征及沉积环境[J].地质评论,2007,53(2):164.SHAO Lei,YOU Hongqing,HAO Hujun,et al.Petrology anddepositional environments of Mesozoic strata in thenortheastern South China Sea[J].Geological Review,2007,53(2):164.
[3]王家林,张新兵,吴健生,等.珠江口盆地基底结构的综合地球物理研究[J].热带海洋学报,2002,21(2):13.WANG Jialin,ZHANG Xinbing,WU Jiansheng,et al.Integrated geophysical researches on base texture of PearlRiver mouth basin[J].Journal of Tropical Oceanography,2002,21(2):13.
[4]陈冰.南海东北部新生代沉积盆地基底的地球物理特征及其地质解释[D].上海:同济大学海洋与地球科学学院,2004.CHEN Bing.Geophysical features and geological interpretationof the sedimentary basin basement in the northeast area ofSouth China Sea[D].Shanghai:College of Ocean and EarthScience of Tongji University,2004.
[5]郝天珧,徐亚,赵百民,等.南海磁性基底分布特征的地球物理研究[J].地球物理学报,2009,52(11):2763.HAO Tianyao,XU Ya,ZHAO Baimin,et al.Geophysicalresearch on distribution features of magnetic basements in theSouth China Sea[J].Chinese Jouenal of Geophysics,2009,52(11):2763.
[6]胡登科,周蒂,吴湘杰,等.南海东北部高磁异常带成因的地球物理反演研究[J].热带海洋学报,2008,27(1):32.HU Dengke,ZHOU Di.Orgin of high magnetic anomaly belt innortheastern south china sea as indicated by geophysicalinversion[J].Journal of Tropical Oceanography,2008,27(1):32.
[7]Sweldens W.The lifting scheme:a construction of secondgeneration wavelets[J].Siam Journal on MathematicalAnalysis,1997,29(2):511.
[8]江凡.南海东北部中生界分布综合地球物理研究[D].上海:同济大学海洋与地球科学学院,2010.JIANG Fan.Integrated geophysical study of Mesozoicdistribution on northeastern continental margin of the SouthChina Sea[D].Shanghai:College of Ocean and Earth Science ofTongji University,2010.
[9]王述功,高仰.南海海盆磁异常理论剖面的计算和磁条带的初步分析[J].海洋科学,1990,11(6):9.WANG Shugong,GAO Yang.Calculation on theoretical profilesof magnetic anomalies and preliminary analyses on magneticlineation in south china sea basin[J].Marine Sciences,1990,11(6):9.
[10]姚伯初,万玲,曾维军,等.中国南海海域岩石圈三维结构及演化[M].北京:地质出版社,2006.YAO Baichu,WAN Ling,ZENG Weijun,et al.The three-dimensional structure of lithosphere and its evolution in theSouth China Sea[M].Beijing:Geology Press,2006.
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