扬子区地壳密度扰动成像和华南燕山期花岗岩成因
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摘要
用区域布格重力场小波变换多尺度分析方法确定了扬子克拉通地壳的密度扰动模式,它反映了区域的壳源大花岗岩基等板内构造。扬子克拉通的大地构造边界和上地壳浅层密度扰动梯度带重合。克拉通内部上地壳浅层密度扰动和大地构造分区没有明显的对应关系;但是它和地质图有一定对应关系。根据构造边界和上地壳浅层密度扰动梯度带一致的原则,利用研究区重力小波细节勾画出了上地壳结晶基底构造图,提供基底构造准确定位的参考。由于大陆地壳经常发生岩层的近水平拆离,地面的地质构造和地下构造可能发生明显变化。基于密度成像的地壳构造研究表明,古地块的碰撞作用使大陆地壳发育裂隙裂缝,在三叠纪华北和扬子克拉通碰撞时地壳原有的裂隙裂缝复活了,又使得热流体活动加剧和中地壳岩石逐渐重熔,形成了雪峰山—幕阜山—皖南黄山燕山期花岗岩带。花岗岩重熔作用属于岩石圈克拉通化的一种作用。现今雪峰山、幕阜山和皖南黄山还是弱地震多发区,说明这个燕山期花岗岩带虽然已经克拉通化,但是克拉通化的程度还是比扬子地块略逊。
Objectives: This work shows the results of computing the 3D density disturbance images in Yangtze Craton and interpretation of the these results based on geodynamics and petro-physics,especially for crust beneath craton terrains.Methods: We apply the scale—depth relationship of gravity anomalies and the multi-scale wavelet analysis for extracting crustal density information from surface Bouguer gravity data,and presents density disturbance images of the upper,middle and lower crust,which represent the three dimensional density structures in the studied area.Results: The tectonic boundary of the Yangtze craton are coincided with the upper-crust density perturbation gradient zones.But inside the craton,there is no obvious correspondence between the density perturbation of the upper crust and the tectonic zoning.However,it has a certain correspondence with the geological map.According to the principle of uniforming structure boundaries and shallow density perturbation gradient bands in the crust,the structure map of the deep crystal basement is drawn by using the detail of gravity wavelet in the study area,which provides a reference for accurate location of basement structure.Because the continental crust often occurs near horizontal detachment of strata,the ground geological structure and underground structure may change obviously.The study of crustal tectonics based on density imaging shows that the ancient collision processes caused cracks and faults in the continental crust,which were resurrected during the Triassic collision between the North China and Yangtze Craton,gradually reducing the hot-fluid activity,rock anatexis and melting in the middle crust.The Xuefeng—Mufu—South Anhui Huangshan Mountain Yanshanian Granite Belt was formed by this way.Conclusions: The granite anatexis is a process of Lithospheric cratonization.Nowadays of Lithospheric craton.Nowadays the Xuefeng—Mufu—Huangshan mountains still belong to weak earthquake regions,which indicates that the Yanshanian Granite Belt has become the Huanan craton,but the degree of its cratonization is slightly less than that of Yangtze massif.
Objectives: This work shows the results of computing the 3D density disturbance images in Yangtze Craton and interpretation of the these results based on geodynamics and petro-physics,especially for crust beneath craton terrains.Methods: We apply the scale—depth relationship of gravity anomalies and the multi-scale wavelet analysis for extracting crustal density information from surface Bouguer gravity data,and presents density disturbance images of the upper,middle and lower crust,which represent the three dimensional density structures in the studied area.Results: The tectonic boundary of the Yangtze craton are coincided with the upper-crust density perturbation gradient zones.But inside the craton,there is no obvious correspondence between the density perturbation of the upper crust and the tectonic zoning.However,it has a certain correspondence with the geological map.According to the principle of uniforming structure boundaries and shallow density perturbation gradient bands in the crust,the structure map of the deep crystal basement is drawn by using the detail of gravity wavelet in the study area,which provides a reference for accurate location of basement structure.Because the continental crust often occurs near horizontal detachment of strata,the ground geological structure and underground structure may change obviously.The study of crustal tectonics based on density imaging shows that the ancient collision processes caused cracks and faults in the continental crust,which were resurrected during the Triassic collision between the North China and Yangtze Craton,gradually reducing the hot-fluid activity,rock anatexis and melting in the middle crust.The Xuefeng—Mufu—South Anhui Huangshan Mountain Yanshanian Granite Belt was formed by this way.Conclusions: The granite anatexis is a process of Lithospheric cratonization.Nowadays of Lithospheric craton.Nowadays the Xuefeng—Mufu—Huangshan mountains still belong to weak earthquake regions,which indicates that the Yanshanian Granite Belt has become the Huanan craton,but the degree of its cratonization is slightly less than that of Yangtze massif.
引文
程裕祺. 1994.中国区域地质概论.北京:地质出版社.
侯遵泽,杨文采.1997.中国重力异常的小波变换与多尺度分析.地球物理学报,40(1):85~95.
侯遵泽,杨文采,等. 1998.中国大陆地壳密度差异多尺度反演.地球物理学报,41(6):642~651.
侯遵泽,杨文采. 2011.塔里木盆地多尺度重力场反演与密度结构.中国科学(D辑),41(1):29~39.
侯遵泽,杨文采. 2012.小波多尺度分析应用.北京:科学出版社.
侯遵泽,杨文采,于长青. 2014.华北克拉通地壳三维密度结构与地质含义.地球物理学报,57(7):2334~2343.
李四光.1942.扬子克拉通何在?地质论评,7(6):253~266.
马丽芳,丁孝忠,剧远景. 2006.中国地质图集.北京:地质出版社.
舒良树,周新民,邓平,余心起,2006.扬子克拉通构造带的基本地质特征.地质论评,52(2):251~265.
徐先兵,张岳桥,贾东,舒良树,王瑞瑞. 2009.华南早中生代大地构造过程.中国地质,36(3).421~428.
杨文采,施志群,侯遵泽,程振炎. 2001.离散小波变换与重力异常多重分解.地球物理学报,44(4):534~541.
杨文采. 2010.东亚古特提斯域大地构造物理学.北京:石油工业出版社:1~443.
杨文采,于长青. 2015a.根据形成地质作用对中国大陆岩石圈作构造分区.地质论评,61(4):715~726.
杨文采,侯遵泽,孙艳云.等. 2015b.用于区域重力场定量解释的多尺度刻痕分析方法.地球物理学报,58(2):520~531.
杨文采,孙艳云,侯遵泽,于常青. 2015c.重力场多尺度刻痕分析与满加尔拗陷深层构造.地质学报,88(2):211~221.
杨文采,侯遵泽,于常青.2015d.青藏高原地壳的三维密度结构和物质运动.地球物理学报,58(11):4223~4234.
杨文采. 2016a.揭开南岭地壳形成演化之谜.地质论评,62(2):257~266.
杨文采,瞿辰,侯遵泽. 2017a.中国大陆造山带地壳密度结构特征.地质论评,63(3):539~548.
杨文采,瞿辰,侯遵泽. 2017b.中国大陆克拉通地体地壳密度结构特征.地质论评,63(4):843~853.
杨文采,邱隆君,于常青,侯遵泽. 2018.塔里木盆地西南部的三维密度扰动成像.地质论评,64(1):1~9.
周新民. 2007.扬子克拉通地区晚中生代花岗岩成因与岩石圈动力学演化.北京:科学出版社.
Chen Yuqi. 1994#. Introduction to Regional Geology in China. Beijing:Geological Publishing House.
Hall R. 2002. Cenozoic geological and plate tectonic evolution of SE Asia and the SW pacific:computed-based reconstructions,models and animation. J. of Asian Earth Sciences,20:353~431.
Hall R. 2012. Plate tectonic evolution of SE Asia and the SW pacific.ectonophysics,570~571:1~41.
Hou Zunze and Yang Wencai. 1997&. Two-dimensional wavelet transform and multiscale analysis of gravity field in China. Chinese J.Geophys.,40(2):261~273.
Hou Zunze, Yang Wencai. 1998&. Multi-scale inversion of density contrast within the crust of China. Chinese J. Geophys.,41(5):642~651.
Hou Zunze and Yang Wencai. 2012&. Wavelet Multi-analysis Method and Applications. Beijing:Science Press:1~96.
Hou Zunze, Yang Wencai. 2011#. Multi-scale inversion of density structure from gravity anomalies in Tarim Basin. Sci. in China,(Ser.D,)54(3):399~409.
Hou Zunze,Yang Wencai,Yu Changqing. 2014&. Three dimensional density structures of the Huabei craton and implications. Chinese J.Geophys.,57(7):2334~2343.
Ma Lifang,Ding Xiaozhong,Ju Yuanjing et al. 2006#. Geological Atlas of China. Beijing:Geological Publishing House.
Shu Liangshu,Zhou Xinmin,Deng Ping, Yu Xinqi. 2006&. Basic characteristics of Naling tectonic belt. Geoloical Review,52(2):251~265.
Xu Xianbing. Zhang Yueqiao,Jia Dong,Shu Liangshu,Wang Ruirui.2009&. Tectonic processes of Huanan in Early Paleozoic. Geology of China,36(3),421~428.
Yang Wencai,Shi Ziqun,Hou Zunze,Chen Zhenyan. 2001&. Descrite wavelet transform and multi-scale decomposition of gravity anomalies.Chinese J. Geophys.,44(4):534~541.
Yang Wencai. 2010#. Tectonophysics of Paleo-Tethyan. Beijing:Petroleum Industry Pub.:1~443.
Yang Wencai, Yu Changqing, 2015a&. Tectonic divisions of the Chinese continental lithosphere based on forming tectonic processes.Geological Review,61(4):715~726.
Yang Wencai,Yu Changqing,Sun Yanyun,Hou Zunze. 2015b&. The multi-scale scratch analysis method for quantitative interpretation of regional gravity field. Chinese J. Geophys.,58(1):41~53.
Yang Wencai,Sun Yanyun,Yu Changqing,Hou Zunze. 2015c&. Multiscale scratch analysis of gravity field and deep structures in Manjar depression. Acta Geologica Sinica,89(2):211~221.
Yang Wencai, Hou Zunze, Yu Changqing. 2015d&. The three dimensional density structures of Qinghai—Tibet Plateau and crustal mass movement. Chinese J. Geophys.,58(11):4223~4234.
Yang Wencai. 2016a&. Raise the curtain on formation and evolution of Nanling Mountain ranges. Geological Review,62(2):257~266.
Yang Wencai, Chen Zhaoxi, Hou Zunze. 2016b. Three dimensional crustal density structure of central Asia and its geological implications. Acta Geophysica,64; DOI:1515/acgeo-2015-0056.
Yang Wencai,Sun Yanyun. 2016c. Discovering crustal deformation bands by processing regional gravity field. Acta Geologica Sinica(English Edition),90(1):66~74.
Yang Wencai,Qu Chen,Hou Zunze. 2017a&. Crustal density structures beneath orogenic belts of Chinese continent. Geological Review,62(3):539~548.
Yang Wencai,Qu Chen,Hou Zunze. 2017b&. Crustal density structures of craton terrains in Chinese continent. Geological Rview,62(4):843~853.
Yang Wencai,Qiu Longjun,Yu Changqing Hou Zunze. 2018&. Three dimensional density perturbation of the southeast Tarim Basin.Geological Review,64(1):1~9.
Zhou Xinmin. 2007. Formation of Late-Mesozoic Granites in Yangtze Craton and Dynamic Evolution of the Lithosphere. Beijing:Scientific Press.
侯遵泽,杨文采.1997.中国重力异常的小波变换与多尺度分析.地球物理学报,40(1):85~95.
侯遵泽,杨文采,等. 1998.中国大陆地壳密度差异多尺度反演.地球物理学报,41(6):642~651.
侯遵泽,杨文采. 2011.塔里木盆地多尺度重力场反演与密度结构.中国科学(D辑),41(1):29~39.
侯遵泽,杨文采. 2012.小波多尺度分析应用.北京:科学出版社.
侯遵泽,杨文采,于长青. 2014.华北克拉通地壳三维密度结构与地质含义.地球物理学报,57(7):2334~2343.
李四光.1942.扬子克拉通何在?地质论评,7(6):253~266.
马丽芳,丁孝忠,剧远景. 2006.中国地质图集.北京:地质出版社.
舒良树,周新民,邓平,余心起,2006.扬子克拉通构造带的基本地质特征.地质论评,52(2):251~265.
徐先兵,张岳桥,贾东,舒良树,王瑞瑞. 2009.华南早中生代大地构造过程.中国地质,36(3).421~428.
杨文采,施志群,侯遵泽,程振炎. 2001.离散小波变换与重力异常多重分解.地球物理学报,44(4):534~541.
杨文采. 2010.东亚古特提斯域大地构造物理学.北京:石油工业出版社:1~443.
杨文采,于长青. 2015a.根据形成地质作用对中国大陆岩石圈作构造分区.地质论评,61(4):715~726.
杨文采,侯遵泽,孙艳云.等. 2015b.用于区域重力场定量解释的多尺度刻痕分析方法.地球物理学报,58(2):520~531.
杨文采,孙艳云,侯遵泽,于常青. 2015c.重力场多尺度刻痕分析与满加尔拗陷深层构造.地质学报,88(2):211~221.
杨文采,侯遵泽,于常青.2015d.青藏高原地壳的三维密度结构和物质运动.地球物理学报,58(11):4223~4234.
杨文采. 2016a.揭开南岭地壳形成演化之谜.地质论评,62(2):257~266.
杨文采,瞿辰,侯遵泽. 2017a.中国大陆造山带地壳密度结构特征.地质论评,63(3):539~548.
杨文采,瞿辰,侯遵泽. 2017b.中国大陆克拉通地体地壳密度结构特征.地质论评,63(4):843~853.
杨文采,邱隆君,于常青,侯遵泽. 2018.塔里木盆地西南部的三维密度扰动成像.地质论评,64(1):1~9.
周新民. 2007.扬子克拉通地区晚中生代花岗岩成因与岩石圈动力学演化.北京:科学出版社.
Chen Yuqi. 1994#. Introduction to Regional Geology in China. Beijing:Geological Publishing House.
Hall R. 2002. Cenozoic geological and plate tectonic evolution of SE Asia and the SW pacific:computed-based reconstructions,models and animation. J. of Asian Earth Sciences,20:353~431.
Hall R. 2012. Plate tectonic evolution of SE Asia and the SW pacific.ectonophysics,570~571:1~41.
Hou Zunze and Yang Wencai. 1997&. Two-dimensional wavelet transform and multiscale analysis of gravity field in China. Chinese J.Geophys.,40(2):261~273.
Hou Zunze, Yang Wencai. 1998&. Multi-scale inversion of density contrast within the crust of China. Chinese J. Geophys.,41(5):642~651.
Hou Zunze and Yang Wencai. 2012&. Wavelet Multi-analysis Method and Applications. Beijing:Science Press:1~96.
Hou Zunze, Yang Wencai. 2011#. Multi-scale inversion of density structure from gravity anomalies in Tarim Basin. Sci. in China,(Ser.D,)54(3):399~409.
Hou Zunze,Yang Wencai,Yu Changqing. 2014&. Three dimensional density structures of the Huabei craton and implications. Chinese J.Geophys.,57(7):2334~2343.
Ma Lifang,Ding Xiaozhong,Ju Yuanjing et al. 2006#. Geological Atlas of China. Beijing:Geological Publishing House.
Shu Liangshu,Zhou Xinmin,Deng Ping, Yu Xinqi. 2006&. Basic characteristics of Naling tectonic belt. Geoloical Review,52(2):251~265.
Xu Xianbing. Zhang Yueqiao,Jia Dong,Shu Liangshu,Wang Ruirui.2009&. Tectonic processes of Huanan in Early Paleozoic. Geology of China,36(3),421~428.
Yang Wencai,Shi Ziqun,Hou Zunze,Chen Zhenyan. 2001&. Descrite wavelet transform and multi-scale decomposition of gravity anomalies.Chinese J. Geophys.,44(4):534~541.
Yang Wencai. 2010#. Tectonophysics of Paleo-Tethyan. Beijing:Petroleum Industry Pub.:1~443.
Yang Wencai, Yu Changqing, 2015a&. Tectonic divisions of the Chinese continental lithosphere based on forming tectonic processes.Geological Review,61(4):715~726.
Yang Wencai,Yu Changqing,Sun Yanyun,Hou Zunze. 2015b&. The multi-scale scratch analysis method for quantitative interpretation of regional gravity field. Chinese J. Geophys.,58(1):41~53.
Yang Wencai,Sun Yanyun,Yu Changqing,Hou Zunze. 2015c&. Multiscale scratch analysis of gravity field and deep structures in Manjar depression. Acta Geologica Sinica,89(2):211~221.
Yang Wencai, Hou Zunze, Yu Changqing. 2015d&. The three dimensional density structures of Qinghai—Tibet Plateau and crustal mass movement. Chinese J. Geophys.,58(11):4223~4234.
Yang Wencai. 2016a&. Raise the curtain on formation and evolution of Nanling Mountain ranges. Geological Review,62(2):257~266.
Yang Wencai, Chen Zhaoxi, Hou Zunze. 2016b. Three dimensional crustal density structure of central Asia and its geological implications. Acta Geophysica,64; DOI:1515/acgeo-2015-0056.
Yang Wencai,Sun Yanyun. 2016c. Discovering crustal deformation bands by processing regional gravity field. Acta Geologica Sinica(English Edition),90(1):66~74.
Yang Wencai,Qu Chen,Hou Zunze. 2017a&. Crustal density structures beneath orogenic belts of Chinese continent. Geological Review,62(3):539~548.
Yang Wencai,Qu Chen,Hou Zunze. 2017b&. Crustal density structures of craton terrains in Chinese continent. Geological Rview,62(4):843~853.
Yang Wencai,Qiu Longjun,Yu Changqing Hou Zunze. 2018&. Three dimensional density perturbation of the southeast Tarim Basin.Geological Review,64(1):1~9.
Zhou Xinmin. 2007. Formation of Late-Mesozoic Granites in Yangtze Craton and Dynamic Evolution of the Lithosphere. Beijing:Scientific Press.