大别山侏罗纪变形及其构造意义
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摘要
大别山造山带作为三叠纪华北与扬子大陆碰撞成因并形成超高压变质岩石已经没有异议。然而,对侏罗纪的变形性质和大地构造背景的认识还未取得一致意见。通过前陆早侏罗世地层褶皱,前陆深部反射地震探测,造山带内 SE 角闪岩相线理变形以及160～120Ma 岩浆岩记录和同位素年代学研究等新的研究成果,证实中侏罗世大别山曾发生强烈的造山运动。这次造山运动相当于“燕山运动”,由于扬子与华北陆块在三叠纪已经拼合成一个大陆,所以侏罗纪变形属于陆内造山性质。将侏罗纪变形事件从大别山碰撞造山过程中分离出来可以合理地解释大别山超高压岩石第二次折返(从壳幔边界到地壳浅部)机理,150Ma 的混合岩化作用和广泛的130～120Ma 花岗岩-火山岩成因,以及大别山前陆 MOHO 错断等现象。
It was widely accepted that the Dabie orogen underwent an ultrahigh-pressure metamorphism as a result of the Triassic collision between the North China and Yangtze continents.However,there has been much debate on the deformation within the orogen and tectonic setting during the Jurassic.The study on the folding of the pre-Jurassic strata and deep reflection seismic exploration in the foreland belt,the SE deformation of amphibolite facies in the high- and ultrahigh~pressure rocks,and the igneous records of 160～120 Ma in the orogen suggest that a strong orogeny took place in the Dabie Mountains in the middle Jurassic.The orogeny was related to the Yanshanian movement.Because the North China and Yangtze blocks have collided and formed an uniform continent in Triassic,the Jurassic deformation was of intra-continental origin.A separation of Jurassic deformation from the Triassic collisional process of the Dabie Mountains could reasonably explain the second exhumation of ultrahigh-pressure metamorphic rocks from the mantle-crust boundary to the upper crust,the genesis of migmatization at 150 Ma and magmatic activity at 130～120 Ma,and the offset of MOHO in the Dabie foreland belt.
It was widely accepted that the Dabie orogen underwent an ultrahigh-pressure metamorphism as a result of the Triassic collision between the North China and Yangtze continents.However,there has been much debate on the deformation within the orogen and tectonic setting during the Jurassic.The study on the folding of the pre-Jurassic strata and deep reflection seismic exploration in the foreland belt,the SE deformation of amphibolite facies in the high- and ultrahigh~pressure rocks,and the igneous records of 160～120 Ma in the orogen suggest that a strong orogeny took place in the Dabie Mountains in the middle Jurassic.The orogeny was related to the Yanshanian movement.Because the North China and Yangtze blocks have collided and formed an uniform continent in Triassic,the Jurassic deformation was of intra-continental origin.A separation of Jurassic deformation from the Triassic collisional process of the Dabie Mountains could reasonably explain the second exhumation of ultrahigh-pressure metamorphic rocks from the mantle-crust boundary to the upper crust,the genesis of migmatization at 150 Ma and magmatic activity at 130～120 Ma,and the offset of MOHO in the Dabie foreland belt.
引文
Ames L,Zhou G and Xiang B.1996． Geochronology and isotopic character of ultrahigh-pressure metamorphism with implications for collision of the Sino-Korean and Yangtze Cratons,central China.Tectonics,15:472-489
Chen JF,Xie Z,Li HM,Zhang XD,Zhou TX,Park YS,Ahn KS,Chen DG and Zhang X.2003． U-Pb zircon ages for a collision-related Krich complex at shidao in the Sulu ultrahigh-pressure terrane,China.Geochemical Journal,37(1) :35-46
Chen TY,Niu BG,Liu ZG,Fu YL and Ren JS.1991． Geochranology of the Yanshanian magmatism and metamorphism in the hinterland of the Dahie Mountains and their geologic significance.Acta Geologica Sinica,65(4) :329-336(in Chinese with English abstract)
Cui SQ,Li JR,Wu ZH,Yi MC,Shen SM,Yin HR and Ma YS.2002． Mesozoic and Cermozoic intracontinental orogenesis of the Yanshan area,China.Beijing:Geological Publishing House(in Chinese)Davis GA,Wang C,Zheng Y,Zhang J,Zhang C and Gehrels GE.1998． The enigmatic Yanshan fold and thrust belt in northern China:new view its intraplate contractional styles,Geology,26(1) :43-46
Deng J,Luo ZH,Su SG,Mo Xx,Yu Bs and Lai Xy.2004． Petrogenesis,geotectonics and metallization.Beijing:Geological Publishing House(in Chinese)
Dong S,Gao R,Cong B,Zhao Z,Liu X,Li S,Li Q and Huang D.2004． Crustal Structure of the southern Dabie ultrhigh-pressure orogen and Yangtze foreland from deep seismic reflection profiling.Terra Nova,16:319-324
Dong SW,Gao R,Liu XM,Li QS,Li SZ,Huang DD,Qian GH,Kuang CY,Guan Y,He RZ and Li PW.2005． Reflection seismic section in the forland of Dahie Mountains.In:Dong SW(ed.).Selected Proceeedings of Chinese Academy of Geological Sciences(1999～2003) .Beijing:Geological Publishing House,13-15(in Chinese)
Gao R,Dang SW,He RZ,Liu XC,Li QS,Guan Y,Bai J,Li PW,Huang DD,Qian GH,Kuang ZY and Li SZ.2004． Subduction process of the Yangtze continental block from Moho reflection image,South China.Earth Science Frontiers,11(3) :43-49
Geological Bureau of Anhui Province.1987． Regional Geolagy of Anhui Province.Beijing:Geological Publishing House(in Chinese)
Hacker BR,Ratschbacher L,Webb LE and Dong S.1995． What brought them up?Exhumation of the Dabie Shan ultrahigh-pressure rocks.Geology,23:743-746
Hacker BR,Ratschbacher L,Webb LE,Ireland T,Walker D and Dong S.1998． Zircon ages constrain the architecture of the ultrahigh-pressure Qinling-Dabie orogen,China.Earth Planet Sci Lett,161:215-230
Hacker B,Ratschbacher L and Liou JG.2004． Subduction,Collision and Exhumation in the ultrahigh-pressure Qiuling-Dahie orogen.In:Mulpas L,Pletcher C,Ali J and Aitchison J(eds.).Aspects of the Tectonics Evolution of China.Geological Society,London,Special Publications,226:157-175
Li S,Xiao Y,Liu D,Chen Y,Ge N,Zhang Z,Sun S-s,Cong B,Zhang R,Hart SR and Wang S.1993． Collision of the North China and Yangtze Blocks and formation of coesite-bearing eclogites:timing and processes.Chem.Geol.,109:89-111
Schmid JC,Ratschbacher L,Hacker BR,Gaitzsch I and Dong S.1999． How did the foreland react?Yangtze foreland fold-and-thrust belt deformation related to exhumation of the Dabie Shan ultrahigh-pressure continental crust(eastern China).Terra Nova,11:266-272
Wong WH,1927． Crustal movement and igneous activities in Estern China since Mesozoic time.Bull.Geol.Soc.China,6(1) :9-36
Xie Z,Wang Z,Zheng Y,Chen J and Zhang X.2001． The mineral O isotopic equilibrium of Zhubuyuan granite and gneiss in the North Dabie Mountains and the Rb-Sr geochronologic affection.Geochimica,30(1) :95-107(in Chinese with English abstract)
Xu ST,Liu YC,Jiang LL,Wu WP and Chen GB.2002． Structural geometry and kinematics of Dabieshan orogen.Heifei:University of Sceices and Technology of China Press(in Chinese)
Yang Z and Besse J.2001． New Mesozoic apparent polar wander path for south China:Tectonic consequences.J.Geophysical Research,106(5) :8493-8520
Yuan XC,Klempere SL,Teng WB,Liu LX and Chetwin E.2003． Crustal structure and Exhumation of the Dabie Shan ultrahigh-pressure orogen,estern China,from seismic reflection profiling.Geology,31:435-438
Zheng YF,Fu B,Gong B and Li L.2002． Stable isotope geochemistry of ultrahigh-pressure metamorphic rocks from the Dabie-Sulu orogen in China:implications for geodynamics and fluid regime.Earth Science Reviews,62:105-161
Zhou TX,Chen JF and Peng ZC.1992． Ar-Ar age of the syenite intrusives in Huoshu of Anhui Province.Geology of Anhui,2(1) :4-11
安徽地质局.1987． 安徽省地质志,地质出版社,北京
陈廷愚,牛宝贵,刘志刚,富云莲,任纪舜.1991． 大别山腹地燕山期岩浆作用和变质作用的同位素年代学研究及其地质意义.地质学报,65(4) :329-336
崔盛芹,李锦蓉,吴珍汉,易明初,沈淑敏,尹华仁,马寅生.2002． 燕山地区中新生代陆内造山作用.北京:地质出版社
邓晋福,罗照华,苏尚国,莫宣学,于炳松,赖兴运.2004． 岩石成因、构造环境与成矿作用,地质出版社,北京
董树文,高锐,刘晓春,李秋生,李三忠,黄东定,钱桂华,匡朝阳,管晔,贺日政,李朋武.2005． 大别山造山带前陆反射地震剖面,见:董树文主编.中国地质科学院1999～2003科技成果汇编.北京:地质出版社,13-15
高锐,董树文,贺日政,刘晓春,李秋生,管晔,白金,李朋武,黄东定,钱桂华,匡朝阳,李三忠.2004． 莫霍面地震发射图象揭露扬子陆块深俯冲过程.地学前缘,11(3) :43-49
谢智,王峥嵘,郑永飞,陈江峰,张巽.2001． 北大别主薄渊花岗岩和片麻岩矿物的氧同位素平衡及其 Rb-Sr 年代学效应,地球化学,30(1) :95-107
徐树桐,刘贻灿,江来利,吴维平,陈冠宝.2002． 大别山造山带的构造几何学和运动学.合肥:中国科学技术出版社
周泰禧,陈江峰,彭子城.1992． 安徽霍舒正长岩带侵入体的 Ar/Ar 同位素地质年龄,安徽地质,2(1) :4-11
Chen JF,Xie Z,Li HM,Zhang XD,Zhou TX,Park YS,Ahn KS,Chen DG and Zhang X.2003． U-Pb zircon ages for a collision-related Krich complex at shidao in the Sulu ultrahigh-pressure terrane,China.Geochemical Journal,37(1) :35-46
Chen TY,Niu BG,Liu ZG,Fu YL and Ren JS.1991． Geochranology of the Yanshanian magmatism and metamorphism in the hinterland of the Dahie Mountains and their geologic significance.Acta Geologica Sinica,65(4) :329-336(in Chinese with English abstract)
Cui SQ,Li JR,Wu ZH,Yi MC,Shen SM,Yin HR and Ma YS.2002． Mesozoic and Cermozoic intracontinental orogenesis of the Yanshan area,China.Beijing:Geological Publishing House(in Chinese)Davis GA,Wang C,Zheng Y,Zhang J,Zhang C and Gehrels GE.1998． The enigmatic Yanshan fold and thrust belt in northern China:new view its intraplate contractional styles,Geology,26(1) :43-46
Deng J,Luo ZH,Su SG,Mo Xx,Yu Bs and Lai Xy.2004． Petrogenesis,geotectonics and metallization.Beijing:Geological Publishing House(in Chinese)
Dong S,Gao R,Cong B,Zhao Z,Liu X,Li S,Li Q and Huang D.2004． Crustal Structure of the southern Dabie ultrhigh-pressure orogen and Yangtze foreland from deep seismic reflection profiling.Terra Nova,16:319-324
Dong SW,Gao R,Liu XM,Li QS,Li SZ,Huang DD,Qian GH,Kuang CY,Guan Y,He RZ and Li PW.2005． Reflection seismic section in the forland of Dahie Mountains.In:Dong SW(ed.).Selected Proceeedings of Chinese Academy of Geological Sciences(1999～2003) .Beijing:Geological Publishing House,13-15(in Chinese)
Gao R,Dang SW,He RZ,Liu XC,Li QS,Guan Y,Bai J,Li PW,Huang DD,Qian GH,Kuang ZY and Li SZ.2004． Subduction process of the Yangtze continental block from Moho reflection image,South China.Earth Science Frontiers,11(3) :43-49
Geological Bureau of Anhui Province.1987． Regional Geolagy of Anhui Province.Beijing:Geological Publishing House(in Chinese)
Hacker BR,Ratschbacher L,Webb LE and Dong S.1995． What brought them up?Exhumation of the Dabie Shan ultrahigh-pressure rocks.Geology,23:743-746
Hacker BR,Ratschbacher L,Webb LE,Ireland T,Walker D and Dong S.1998． Zircon ages constrain the architecture of the ultrahigh-pressure Qinling-Dabie orogen,China.Earth Planet Sci Lett,161:215-230
Hacker B,Ratschbacher L and Liou JG.2004． Subduction,Collision and Exhumation in the ultrahigh-pressure Qiuling-Dahie orogen.In:Mulpas L,Pletcher C,Ali J and Aitchison J(eds.).Aspects of the Tectonics Evolution of China.Geological Society,London,Special Publications,226:157-175
Li S,Xiao Y,Liu D,Chen Y,Ge N,Zhang Z,Sun S-s,Cong B,Zhang R,Hart SR and Wang S.1993． Collision of the North China and Yangtze Blocks and formation of coesite-bearing eclogites:timing and processes.Chem.Geol.,109:89-111
Schmid JC,Ratschbacher L,Hacker BR,Gaitzsch I and Dong S.1999． How did the foreland react?Yangtze foreland fold-and-thrust belt deformation related to exhumation of the Dabie Shan ultrahigh-pressure continental crust(eastern China).Terra Nova,11:266-272
Wong WH,1927． Crustal movement and igneous activities in Estern China since Mesozoic time.Bull.Geol.Soc.China,6(1) :9-36
Xie Z,Wang Z,Zheng Y,Chen J and Zhang X.2001． The mineral O isotopic equilibrium of Zhubuyuan granite and gneiss in the North Dabie Mountains and the Rb-Sr geochronologic affection.Geochimica,30(1) :95-107(in Chinese with English abstract)
Xu ST,Liu YC,Jiang LL,Wu WP and Chen GB.2002． Structural geometry and kinematics of Dabieshan orogen.Heifei:University of Sceices and Technology of China Press(in Chinese)
Yang Z and Besse J.2001． New Mesozoic apparent polar wander path for south China:Tectonic consequences.J.Geophysical Research,106(5) :8493-8520
Yuan XC,Klempere SL,Teng WB,Liu LX and Chetwin E.2003． Crustal structure and Exhumation of the Dabie Shan ultrahigh-pressure orogen,estern China,from seismic reflection profiling.Geology,31:435-438
Zheng YF,Fu B,Gong B and Li L.2002． Stable isotope geochemistry of ultrahigh-pressure metamorphic rocks from the Dabie-Sulu orogen in China:implications for geodynamics and fluid regime.Earth Science Reviews,62:105-161
Zhou TX,Chen JF and Peng ZC.1992． Ar-Ar age of the syenite intrusives in Huoshu of Anhui Province.Geology of Anhui,2(1) :4-11
安徽地质局.1987． 安徽省地质志,地质出版社,北京
陈廷愚,牛宝贵,刘志刚,富云莲,任纪舜.1991． 大别山腹地燕山期岩浆作用和变质作用的同位素年代学研究及其地质意义.地质学报,65(4) :329-336
崔盛芹,李锦蓉,吴珍汉,易明初,沈淑敏,尹华仁,马寅生.2002． 燕山地区中新生代陆内造山作用.北京:地质出版社
邓晋福,罗照华,苏尚国,莫宣学,于炳松,赖兴运.2004． 岩石成因、构造环境与成矿作用,地质出版社,北京
董树文,高锐,刘晓春,李秋生,李三忠,黄东定,钱桂华,匡朝阳,管晔,贺日政,李朋武.2005． 大别山造山带前陆反射地震剖面,见:董树文主编.中国地质科学院1999～2003科技成果汇编.北京:地质出版社,13-15
高锐,董树文,贺日政,刘晓春,李秋生,管晔,白金,李朋武,黄东定,钱桂华,匡朝阳,李三忠.2004． 莫霍面地震发射图象揭露扬子陆块深俯冲过程.地学前缘,11(3) :43-49
谢智,王峥嵘,郑永飞,陈江峰,张巽.2001． 北大别主薄渊花岗岩和片麻岩矿物的氧同位素平衡及其 Rb-Sr 年代学效应,地球化学,30(1) :95-107
徐树桐,刘贻灿,江来利,吴维平,陈冠宝.2002． 大别山造山带的构造几何学和运动学.合肥:中国科学技术出版社
周泰禧,陈江峰,彭子城.1992． 安徽霍舒正长岩带侵入体的 Ar/Ar 同位素地质年龄,安徽地质,2(1) :4-11
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