| 大陆深俯冲带的地壳速度结构——东大别造山带深地震宽角反射/折射研究 |
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| 引用本文： | 刘福田,徐佩芬,刘劲松,尹周勋,秦建业,张先康,张成科,赵金仁.大陆深俯冲带的地壳速度结构——东大别造山带深地震宽角反射/折射研究[J].地球物理学报,2003,46(3):366-372. |
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| 作者姓名： | 刘福田 徐佩芬 刘劲松 尹周勋 秦建业 张先康 张成科 赵金仁 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所, 北京 100029 2 多伦多大学物理系，多伦多 M5S 2J5 3 中国地震局郑州地球物理勘探中心, 郑州 450002 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家自然科学基金，G1999075505，49794044，， |
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| 摘 要： | 在安徽大别山(东大别)进行的深地震宽角反射/折射探测获得6条二维地壳速度结构剖面. 结果显示，东大别造山带地壳为一高速穹隆构造，在其核部中、下地壳变质岩出露于地表，波速高达5.0km/s；在其翼部，上、中地壳发育速度约6.1km/s的壳内低速层(体). 莫霍面的起伏变化较大，中心部位深达41km左右，周边地区则抬升到32～34km. 在晓天—磨子潭断裂一线下方莫霍面垂向错断，断距约4km. 东大别造山带具有大陆深俯冲-碰撞造山带地壳结构的典型式样. 莫霍面错断与扬子陆块深俯冲有关，错断处表征扬子与华北陆块碰撞缝合的深部位置. 高速穹隆构造可能是两陆块碰撞挤压的产物，穹隆翼部上、中地壳发育的低速滑脱带(面)可能在碰撞期之后的地壳伸展、超高压变质岩从中地壳抬升出露于地表过程中起到重要作用.
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| 关 键 词： | 大陆深俯冲带 东大别造山带 深地震测深 地壳速度结构 |
| 文章编号： | 0001-5733(2003)03-0366-07 |
| 收稿时间： | 2002-4-3 |
| 修稿时间： | 2002-12-10 |
THE CRUSTAL VELOCITY STRUCTURE OF THE CONTINENTAL DEEP SUBDUCTION BELT：STUDY ON THE EASTERN DABIE OROGEN BY SEISMIC WIDE-ANGLE REFLECTION / REFRACTION |
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| LIU FUTIANXU.THE CRUSTAL VELOCITY STRUCTURE OF THE CONTINENTAL DEEP SUBDUCTION BELT：STUDY ON THE EASTERN DABIE OROGEN BY SEISMIC WIDE-ANGLE REFLECTION / REFRACTION[J].Chinese Journal of Geophysics,2003,46(3):366-372. |
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| Authors: | LIU FUTIANXU |
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| Institution: | 1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Department of Physics, University of Toronto, Toronto Ontario, M5S 2J5, Canada 3 Research Center of Exploration Geophysics, CSB, Zhengzhou 450002, China |
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| Abstract: | Six two dimensional crustal structure profiles in the eastern Dabie, Anhui Province, have been obtained by the wide angle reflection/refraction. The results reveal that the crust of the eastern Dabie orogen presents a high velocity dome, the velocity in the middle and lower crust′s metamorphic rocks exposed on the surface in the core of the dome approaches 5.0 km/s, the low velocity layers (body) with about 6.1 km/s has developed in upper middle crust in it′s both sides wing, the Moho discontinuity relatively largely varies and ranges from ～ 41km in the core to 32～34 km in both sides, and a 4 km Moho offset is observed beneath along Xiaotian Muzitan Fault. We recognize that the eastern Dabie orogen shows a velocity pattern of typical continent continent deep subduction/collision style. The Moho offset may be related with the deep subduction of the Yangtze Block, and represents the suture zone between the Yangtz e/Sino Korean Block collision. Therefore, the high velocity dome may occur by collision/extrusion between the both continental Blocks and the low velocity layers (body) mentioned above may play an important role in the post c ollisional crust extension and exhumation of the ultra high press metamorphic r ocks. |
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| Keywords: | Continental deep subduction belt Eastern Dabie orogen Deep seismic sounding Crustal velocity structure |
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