| 根据地球物理资料分析大别——苏鲁超高压变质带演化的运动学与动力学 |
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| 引用本文： | 杨文采,余长青.根据地球物理资料分析大别——苏鲁超高压变质带演化的运动学与动力学[J].地球物理学报,2001,44(3):346-359. |
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| 作者姓名： | 杨文采 余长青 |
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| 作者单位： | 1. 中国地质科学院地质研究所, 北京100037;
2. 中国地质大学研究生院, 北京100083; |
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| 基金项目： | 国土资源部基础研究项目，9501205，9501206， |
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| 摘 要： | 中国中央造山带东部的大别-苏鲁是全球最大的超高压变质带,本文基于地球物理资料的分析和综合研究,进一步指出这一超高压变质带演化的复杂性.在扬子与中朝克拉通碰撞后大别-苏鲁地体的俯冲产生超高压变质作用.之后由于两个克拉通之间的倾斜碰撞,产生旋转与局部的拉张为岩石折返造成了良好条件.扬子的旋转也形成一对剪切力使俯冲海洋岩石圈断开和陆块反弹.然而由于南北压挤力的继续作用与大别-苏鲁地体的折返,扬子克拉通继续向大别苏鲁地体下方俯冲.这种陆-陆俯冲携带了大量大陆物质进入上地幔,诱发部分熔融和后期的地幔上隆.本文给出了大别-苏鲁演化动力学的修正模型.
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| 关 键 词： | 超高压变质作用 大别-苏鲁 地球物理 演化模型 动力学分析 |
| 文章编号： | 0001-5733(2001)03-0346-14 |
| 收稿时间： | 2000-11-09 |
KINETICS AND DYNAMICS OF DEVELOPMENT OF THE DABIE-SULU UHPM TERRANES BASED ON GEOPHYSICAL EVIDENCES |
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| YANG WEN,CAI.KINETICS AND DYNAMICS OF DEVELOPMENT OF THE DABIE-SULU UHPM TERRANES BASED ON GEOPHYSICAL EVIDENCES[J].Chinese Journal of Geophysics,2001,44(3):346-359. |
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| Authors: | YANG WEN CAI |
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| Institution: | 1. Institute of Geology, CAGS, Beijing 100037, China;
2. Chinese University of Geosciences, Beijing 100083, China |
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| Abstract: | The Dabie Sulu region, located in the east part of the central orogenic belt of China, has the largest ultrahigh pressure metamorphic （UHPM） zone in the world. Based mainly on geophysical data newly obtained in the region, this paper shows the sophistication of the evolution and dynamics of the Dabie-Sulu UHPM belt. The subduction of the Dabie-Sulu terranes after collision between the Sino Korean and Yangtze cratons induced the ultrahigh pressure metamorphism. A local extension occurred in Dabie-Sulu region after the subduction, yielding good conditions for exhumation of the UHPM rocks. The local extension was the result of Yangtze rotation that was generated by the oblique impact between the two cratons. The Yangtze rotation might also provided a pair of shear forces on bottom of the lithosphere to make a breakoff event that is essential to the exhumation of the UHPM terranes. Owing to continuing convergence between the two cratons after the exhumation of Dabie-Sulu UHPM terranes, Yangtze craton proceeded to subduct beneath the Dabie Sulu terranes and the Sino Korean craton. This intracontinental subduction carried tremendous mass of crustal materials into the upper mantle, causing later partial melting, mantle doming and rifting. Based on above mentioned analysis, the previous models for evolution of the Dabie-Sulu terranes are elaborated. |
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| Keywords: | Ultrahigh pressure metamorphism Dabie-Sulu region Regional geophysics Evolution model Dynamic analysis |
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