Geometry,kinematics and evolution of the Tongbai orogenic belt |
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基金项目: | 中国科学院资助项目;国家重点基础研究发展计划(973计划) |
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摘 要: | 1 Introduction spectively2,3]. Several tectonic units such as the Bei- The Qinling-Dabie orogenic belt has attracted huaiyang, north Dabie, south Dabie and Susong belts worldwide attention by its very complex and abundant have been recognized in eastern Dabie4]. Nine tec- geological characters, and has been a “hot point” of tonic units have been recognized in western Dabie and international geological research1]. A vast amount of a more detailed division has been suggested especially …
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收稿时间: | 16 April 2005 |
修稿时间: | 23 November 2005 |
Geometry, kinematics and evolution of the Tongbai orogenic belt |
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Authors: | HUANG Shaoying XU Bei WANG Changqiu ZHAN Sheng DENG Rongjing |
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Institution: | The Key Laboratory of Orogenic Belts and Crustal Evolution Peking University, Ministry of Education, Beijing 100871, China |
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Abstract: | The Tongbai orogenic belt (TOB) is composed of six tectonic units. From south to north these units are: Tongbai gneiss rise
(TGR); Hongyihe-Luozhuang eclogite belt (HLE); Maopo-Hujiazhai igneous rock belt (MHI); Zhoujiawan flysch belt (ZFB); Yangzhuang
greenschist belt (YGB); and Dongjiazhuang marble belt (DMB). The geometry and kinematic images of the TOB include: the antiformal
structures caused by a later uplift process, the top-to-north ductile shear structure that related to a process that the ultrahigh
pressure rocks are brought to surface, the top-to-south ductile shear thrust and the sinistrial shear structures related to
a south-north direction compression, and the east-west direction fold structures in the upper crust. In the view of the multistage
subduction-collision orogenic belt, according to the characters of petrology and its distribution, geometry, kinematics and
structural chronology in these tectonic units, tectonic evolution of the TOB can be divided into four stages: oceanic crust
subduction during 400–300 Ma, continental collision during 270–250 Ma, continental deep subduction and uplift during 250–205
Ma and doming deformation during 200–185 Ma. |
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Keywords: | Tongbai geometry kinematics tectonic unit orogenic belt evolution |
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