| 秦岭造山带根部地壳结构及流变学演化 |
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| 引用本文： | 索书田,游振东.秦岭造山带根部地壳结构及流变学演化[J].地球科学,1994,19(5):633-646. |
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| 作者姓名： | 索书田 游振东 |
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| 作者单位： | 中国地质大学地质系 武汉430074
(索书田，游振东，钟增球，陈能松)，中国地质大学地质系 武汉430074(桑隆康) |
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| 基金项目： | 国家自然科学基金85040093、49290100及49172090项目成果 |
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| 摘 要： | 在地质和地球物理资料基础上，运用物理学观点，研究和分析了秦岭造山带根部－大别前寒武纪变质地体的三维结构及流变学演化历史，通过现代及中－新元古代时期地壳流变学剖面的构筑，强调地壳流变学分层性及变质变形分解作用对中下地壳结构及地球动力学演化的控制作用，线状强应变带与透镜状弱应变域的规律组合，是秦岭造山带及其根部地壳结构的基本样式，并具尺度不变性，将古老中下地壳近３Ｇａ的流变学演化历史划分为７个阶段。它
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| 关 键 词： | 造山带 地壳结构 流变学 秦岭 |
Crustal Texture and Rheological Evolution of Root Zones in Qinling Orogenic Belt |
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| Suo Shutian You Zhendong Zhong Zengqiu Chen Nengsong Sang Longkang.Crustal Texture and Rheological Evolution of Root Zones in Qinling Orogenic Belt[J].Earth Science-Journal of China University of Geosciences,1994,19(5):633-646. |
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| Authors: | Suo Shutian You Zhendong Zhong Zengqiu Chen Nengsong Sang Longkang |
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| Abstract: | The Qinling Orogenic Belt (QOB) reprensents a polyphase boundary collision zone between the North China Block and the Yangtze Block, in which the Dabie Precambrian metamorphic terrane is an exhumed portion of the middle-lower crust or root part of the orogenic belt. The root part has an extremely complicated crustal texture and the most outstanding tectonic features of the crust are their anastomosing tectonic patterns with lens-shaped domains of low strain separated by anastomosing belts of high strain. The rheological nature of the middle-lower crust is approached from a physical standpoint. The crustal rheology was assessed on the basis of the frictional failure in the brittle regime, and power-law creep in the ductile regime. Rheological profiles are constructed for 1-D crustal structural and thermal model limited to the current and the Mid - Late Proterozoic configurations of the deformed belt, respectively. The profiles highlight the rheological stratification of the crust and indicate that the deformation was strongly heterogeneous and partitioned since Mid -Late Proterozoic times at least. Seven rheological evolution stages for the root part are defined on the basis of large body of geological and geophysical data available in the region. The rheological profiles and stages are used to explain tectonic-metamorphic features such as the depth of the brittle-ductile transition, the old metamorphic core complexes and the strength discontinuites or decollement zones in the Qinling Orogenic Belt. It is emphasized that an understanding of the middle-lower crustal rheology in the orogenic belt is therefore essential to the understanding of the dynamics of large-scale tectonic processes. |
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| Keywords: | root part middle-lower crust rheological stratification Qinling Orogenic Belt strain - metamorphism partitioning |
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