大别造山带地壳速度结构与动力学
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摘要
1994年完成的大别造山带深地震测深剖面（全长420km）穿越了华北地块，大别造山带和扬子地块三个构造单元．获得了垂向成层、横向分块的地壳纵、横波速度结构．结合地质、地球化学研究成果，大别山地壳可分为三层：上地壳是多重叠覆的构造岩石层，中地壳为韧性变形层，下地壳整体成分偏酸性．大别山地表及浅部的超高压变质岩石具有典型的薄皮构造特征．本文提出大别山不同期双向俯冲造山模式和超高压变质岩石的反向加楔退拔折返机制；大别山腹地至今仍保留6-8km厚的山根．
Seismic sounding data along a 420km long profile was collected in 1994. From north to south the profile goes across three tectonic units, namely North China Block,Dabieshan Orogenic Belt and Yangtze Block. By forward modeling, a vertically layered and laterally blocked crust velocity model as well as its Poisson's ratio section was obtained. According to the seismic experiment associated with geological and geochemical research, the following inferences are drawn. The crust can be divided into three layers. The upper crust exhibits a multiple napped-sheets structure and the middle crust ductile deformed layers. The lower crust of the Dabieshan Belt appears to be acidic in composition as a whole. The Debieshan's UHP metamorphic rocks are characterized by a typical thin skin sheet structure. Anasynchronous dual subduction mountain-building model and opposite wedging and drawing exhumation machanism of the UHP rocks are suggested. It is quite evident that there exists a mountain root of about 6-8km thick under the Dakieshan mountain.
Seismic sounding data along a 420km long profile was collected in 1994. From north to south the profile goes across three tectonic units, namely North China Block,Dabieshan Orogenic Belt and Yangtze Block. By forward modeling, a vertically layered and laterally blocked crust velocity model as well as its Poisson's ratio section was obtained. According to the seismic experiment associated with geological and geochemical research, the following inferences are drawn. The crust can be divided into three layers. The upper crust exhibits a multiple napped-sheets structure and the middle crust ductile deformed layers. The lower crust of the Dabieshan Belt appears to be acidic in composition as a whole. The Debieshan's UHP metamorphic rocks are characterized by a typical thin skin sheet structure. Anasynchronous dual subduction mountain-building model and opposite wedging and drawing exhumation machanism of the UHP rocks are suggested. It is quite evident that there exists a mountain root of about 6-8km thick under the Dakieshan mountain.
引文
1董树文,孙先如,张勇等.大别山造山带基本结构.科学通报,1993,36(6):542-545
2 Cong Bolin, Wang Qingcheen Ultrahigh-pressure metamorphic rochs in China.Episodes, 1995, 18(1-2):91-94
3徐树桐,江来利,刘贻灿,张勇.大别山(安徽部分)的构造格局和演化过程.地质学报,1992,66(1):1-14
4 Okny A Sengor A M. Evidence for intracontinantal thrust-relate exhumation of the UHP rocks in China Geology,1992,20:41-414
5Hacker B,Ratschbacher L, Webb L,Dong S.What brought them up?Exhumation of the Debieshan ultrahigh-pressure rocks. Geology, 1995, 23(8):743-746
6任纪舜,张正坤,牛宝贵,刘志刚.中国东部及邻区大陆岩石圈的构造演化与成矿.北京:科学出版社,1990
7牛宝贵,富云莲,刘志刚,任纪舜.鄂北蓝片岩的Ar-Ar定年及其地质意义.科学通报,1993,38(4):1309-1313
吕汤加富,荆延仁,侯明金等.安徽大别山-张八岭地区新的构造格局与非板块碰撞造山过程.安徽地质,1995,5(3):1-12
9Deng Shuwery Wu Xunazhi, Cao Rei et al. Preliminary study on deep geology of the Dabie orogenic belt Continental Dynamics,1996, 1(2):103-108
10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(3):221-226
11常印佛,董树文,黄德志.论长江中下游"一盖多底"的构造格局.火山地质与矿产, 1996, 17(1-2): 1-14
12董树文,方景爽,李勇等.下扬子中三叠世一中侏罗世沉积相与印支运动.地质论评,1994,40(2):111-119
13常印佛,刘湘培,吴言昌.长江中下游铜铁成矿带.北京:地质出版社,1992
14陈江峰,周泰禧,邢凤鸣等.长江中下游岩带含铜岩体的Pb、Sr、Nd同位素特征.地球学报,1994,1(1-2): 111-116
15邢凤鸣,徐样.安徽沿江地区中生代岩浆的基本特征.岩石学报,1995,11(4):409-422
16董树文,王小凤,黄德志.大别山超高压变质带内浅变质岩片的发现及意义.科学通报,1996,41(9):812-815
17李曙光,Hart S. R,郑双根.中国华北,华南陆块碰撞时代的钐-钕同位素年龄证据.中国科学(B辑),1989, 19(3):312-319
18李秀新,刘德良,王华俊等.中国东部华北板块与扬子板块的分界问题.见:李继亮主编.中国东南海陆岩石圈 结构与演化研究,北京:中国科技出版社,1992. 32-45
19高山,金振民,Korn H等.大别超高压榴辉岩高温高压下地震波速和密度的实验研究:对造山带地壳深部组成 和Moho面性质的启示.科学通报,1997,42(8):862-865
20 Holbrook W S, Mooney W D, Christensen N I. The seismic velocity structure of the deep continental crust. In:D.M.Fountion et al. eds, Continental Lower Crust,Developments in Geotectonics 23,Elsevier,1992, 1-43
21 Cong Bolin ed.,Ultrahigh-pressure metamorphic rocks in the Dabieshan-Sulu region of China.Beijing: Science Nress,Dordrecht,Boston, London:Kluwer Academic Publicshers, 1996
22 Jahn B M,Cornichet J,Cong B.L., Yui T T.Ultiahigh-εNd eclogites from an ultrahigh-pressure metamorphic terrance of China. Chemical Geology, 1996, 127:61-79
23董树文,吴宣志,高锐等.大别山造山带深部地质初探.中国地质,1997,236:32-37
24陈江峰,谢智,刘顺生等.大别山造山带冷却年龄的Ar/Ar年龄测定.中国科学(B辑),1995,25(10):1086- 1091
2 Cong Bolin, Wang Qingcheen Ultrahigh-pressure metamorphic rochs in China.Episodes, 1995, 18(1-2):91-94
3徐树桐,江来利,刘贻灿,张勇.大别山(安徽部分)的构造格局和演化过程.地质学报,1992,66(1):1-14
4 Okny A Sengor A M. Evidence for intracontinantal thrust-relate exhumation of the UHP rocks in China Geology,1992,20:41-414
5Hacker B,Ratschbacher L, Webb L,Dong S.What brought them up?Exhumation of the Debieshan ultrahigh-pressure rocks. Geology, 1995, 23(8):743-746
6任纪舜,张正坤,牛宝贵,刘志刚.中国东部及邻区大陆岩石圈的构造演化与成矿.北京:科学出版社,1990
7牛宝贵,富云莲,刘志刚,任纪舜.鄂北蓝片岩的Ar-Ar定年及其地质意义.科学通报,1993,38(4):1309-1313
吕汤加富,荆延仁,侯明金等.安徽大别山-张八岭地区新的构造格局与非板块碰撞造山过程.安徽地质,1995,5(3):1-12
9Deng Shuwery Wu Xunazhi, Cao Rei et al. Preliminary study on deep geology of the Dabie orogenic belt Continental Dynamics,1996, 1(2):103-108
10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(3):221-226
11常印佛,董树文,黄德志.论长江中下游"一盖多底"的构造格局.火山地质与矿产, 1996, 17(1-2): 1-14
12董树文,方景爽,李勇等.下扬子中三叠世一中侏罗世沉积相与印支运动.地质论评,1994,40(2):111-119
13常印佛,刘湘培,吴言昌.长江中下游铜铁成矿带.北京:地质出版社,1992
14陈江峰,周泰禧,邢凤鸣等.长江中下游岩带含铜岩体的Pb、Sr、Nd同位素特征.地球学报,1994,1(1-2): 111-116
15邢凤鸣,徐样.安徽沿江地区中生代岩浆的基本特征.岩石学报,1995,11(4):409-422
16董树文,王小凤,黄德志.大别山超高压变质带内浅变质岩片的发现及意义.科学通报,1996,41(9):812-815
17李曙光,Hart S. R,郑双根.中国华北,华南陆块碰撞时代的钐-钕同位素年龄证据.中国科学(B辑),1989, 19(3):312-319
18李秀新,刘德良,王华俊等.中国东部华北板块与扬子板块的分界问题.见:李继亮主编.中国东南海陆岩石圈 结构与演化研究,北京:中国科技出版社,1992. 32-45
19高山,金振民,Korn H等.大别超高压榴辉岩高温高压下地震波速和密度的实验研究:对造山带地壳深部组成 和Moho面性质的启示.科学通报,1997,42(8):862-865
20 Holbrook W S, Mooney W D, Christensen N I. The seismic velocity structure of the deep continental crust. In:D.M.Fountion et al. eds, Continental Lower Crust,Developments in Geotectonics 23,Elsevier,1992, 1-43
21 Cong Bolin ed.,Ultrahigh-pressure metamorphic rocks in the Dabieshan-Sulu region of China.Beijing: Science Nress,Dordrecht,Boston, London:Kluwer Academic Publicshers, 1996
22 Jahn B M,Cornichet J,Cong B.L., Yui T T.Ultiahigh-εNd eclogites from an ultrahigh-pressure metamorphic terrance of China. Chemical Geology, 1996, 127:61-79
23董树文,吴宣志,高锐等.大别山造山带深部地质初探.中国地质,1997,236:32-37
24陈江峰,谢智,刘顺生等.大别山造山带冷却年龄的Ar/Ar年龄测定.中国科学(B辑),1995,25(10):1086- 1091
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