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| 莫霍面地震反射图像揭露出扬子陆块深俯冲过程 | |
| 引用本文： | 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.莫霍面地震反射图像揭露出扬子陆块深俯冲过程[J].地学前缘,2004,11(3):43-49. |
| 作者姓名： | 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 |
| 作者单位： | 1. 中国地质科学院,地质研究所,北京,100037 2. 中国地质科学院,北京,100037 3. 中国地质科学院,地质力学研究所,北京,100081 4. 中国石油化工股份有限公司,华东石油局第六物探大队,江苏,南京,210009 5. 中国地质科学院,北京,100037;中国石油化工股份有限公司,华东石油局第六物探大队,江苏,南京,210009 6. 青岛海洋大学,山东,青岛,266003 |
| 基金项目： | 国家重点基础研究发展规划项目“大陆深俯冲机制”(GT1 9990 75 5 0 5 )，国土资源部专项科技计划项目“中国岩石圈三维结构数据库”(2 0 0 0 1 0 1 0 1 ) |
| 摘 要： | 近垂直深地震反射剖面对莫霍面变化的观测 ,强有力地说明大陆莫霍面的复杂特征记录了岩石圈的构造历史。横过大别山造山带前陆的深地震反射剖面长约 1 4 0km ,记录时间达 3 0s ,探测深度超过莫霍面深达岩石圈地幔。深地震反射剖面揭示出扬子陆块与大别山造山带结合部位的岩石圈精细结构、清晰的莫霍面及其变化特征。作为相关解释的第一步 ,我们将探测到的莫霍面变化特征与其他特殊反映不同地质年代和岩石圈构造历史的深地震反射剖面进行对比 ,以追索扬子陆块与大别山造山带的岩石圈构造过程。总体北倾的莫霍面和同样北倾的下地壳结构记录了中生代扬子陆块的向北俯冲。北倾的莫霍面错断、叠置现象描述出扬子陆块的俯冲过程。大别山前向北和向南倾斜的交叉反射图像 ,反映了扬子陆块与大别山造山带岩石圈尺度的碰撞关系 |
| 关 键 词： | 莫霍面反射 大别山造山带 前陆 扬子陆块 大陆深俯冲 深地震反射剖面 |
| 文章编号： | 1005-2321(2004)03-0043-07 |
| 修稿时间： | 2004年5月18日 |
Subduction process of the Yangtze continental block from Moho reflection image, South China |
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| GAO Rui,DONG Shu-wen,HE Ri-zheng,Liu Xiao-chun,LI Qiu-sheng,GUAN Ye,BAI Jin,LI Peng-wu,HUANG Dong-ding,QIAN Gui-hua.Subduction process of the Yangtze continental block from Moho reflection image, South China[J].Earth Science Frontiers,2004,11(3):43-49. | |
| Authors: | GAO Rui DONG Shu-wen HE Ri-zheng Liu Xiao-chun LI Qiu-sheng GUAN Ye BAI Jin LI Peng-wu HUANG Dong-ding QIAN Gui-hua |
| Institution: | GAO Rui~1,DONG Shu-wen~2,HE Ri-zheng~1,Liu Xiao-chun~3,LI Qiu-sheng~1,GUAN Ye~1,BAI Jin~1,LI Peng-wu~1,HUANG Dong-ding~4,QIAN Gui-hua~ |
| Abstract: | Observation of Moho variability from near-vertical incidence seismic reflection survey suggests that the complex nature of the continental Moho may be strongly influenced by the tectonic history of the lithosphere. A near-vertical deep seismic reflection profile across the whole foreland of Dabie Shan Orogen, is about 140 km long, and the length of recorded time was up to 30 s two-way time with a 600-channel and 24-bit SN 388, to make sure that sounding depth be over the depth to Moho and down to the Mantle. Seismic reflection data depicted detail structure of lithosphere beneath the joint of Yangtze block with Dabie Shan Orogen. As an initial step in attempting to determine such correlations, we qualitatively compare Moho reflection variability with other deep seismic reflection profiles that sample regions of exceptionally diverse age and tectonic history of the lithosphere. The detail image of seismic reflection shows that Moho is north dipping as the same as north-dipping lower crust of the Yanytze block. The North-dipping structure recorded northward subduction of the Yangtze block happened in Mesozoic. And North-dipping Moho offsetting and stacking implicate the subduction process of the Yangtze block. The colliding relationship between Yangtze block and Dabie Shan Orogen in the lithosphere scale has been revealed out by the image of the intersect reflection constituted by North-dipping and South-dipping in the front of Dabie Shan Orogen. |
| Keywords: | Moho reflection Dabie Shan Orogen foreland Yangtze Continental Block deep subduction of continent deep seismic reflection profile |
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