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The Ductile Deformation Characteristics of Caledonian Intracontinental Orogeny in the Northeastern Jiangshan-Shaoxing Tectonic Zone:Insights from Magnetic Fabric Study and Its Geodynamic Implication
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  • 英文篇名:The Ductile Deformation Characteristics of Caledonian Intracontinental Orogeny in the Northeastern Jiangshan-Shaoxing Tectonic Zone:Insights from Magnetic Fabric Study and Its Geodynamic Implication
  • 作者:GONG ; Genhui ; CHEN ; Hanlin ; WANG ; Fang ; LIN ; Xiubin ; MENG ; Lifeng
  • 英文作者:GONG Genhui;CHEN Hanlin;WANG Fang;LIN Xiubin;MENG Lifeng;Departement of Earth Sciences,Zhejiang University;Research Center of Structures in Oil and Gas Bearing Basin,Ministry of Education;
  • 英文关键词:magnetic fabric;;ductile deformation;;deformation intensity;;deformation pattern;;Jiangshan-Shaoxing tectonic zone
  • 中文刊名:DZXW
  • 英文刊名:地质学报(英文版)
  • 机构:Departement of Earth Sciences,Zhejiang University;Research Center of Structures in Oil and Gas Bearing Basin,Ministry of Education;
  • 出版日期:2016-02-15
  • 出版单位:Acta Geologica Sinica(English Edition)
  • 年:2016
  • 期:v.90
  • 基金:supported by the project of geological survey and evolution of Jiangshan-Shaoxing tectonic zone from Department of Land and Resources of Zhejiang Province
  • 语种:英文;
  • 页:DZXW201601011
  • 页数:13
  • CN:01
  • ISSN:11-2001/P
  • 分类号:85-97
摘要
The Jiangshan-Shaoxing tectonic zone was the northeastern boundary between the Yangtze Block and the Cathaysia Block during the Neoproterozoic and was an intracontinental orogenic belt during late of the early Paleozoic.In this tectonic zone,there develops a lot of mylonite underwent strong ductile deformation and schist,gneiss,and amphibolite with medium and high grade metamorphism which was formed during the late of early Paleozoic.The research of geometry and kinematic of ductile deformation in Jiangshan-Shaoxing tectonic zone is very important to reveal the tectonic process of intracontinental orogeny.This paper uses the anisotropy of magnetic susceptibility(AMS)to determine the ductile deformation geometry and kinematic of Jiangshan-Shaoxing tectonic zone combing with the field survey.In this study,190 specimens of 19 locations and 221 specimens of23 locations from Wangjiazhai section and Lipu-Sizhai section were analyzed.The magnetic foliation over magnetic lineation in both Wangjiazhai and Lipu-Sizhai sections together with the field observations indicated a compressional deformation pattern.3 and 4 strong ductile deformation zones can be established in the Wangjiazhai section and the Lipu-Sizhai section,respectively.According to the magnetic fabric and petro-fabric studies,the Northeastern Jiangshan-Shaoxing tectonic zone suffered two kinds of deformation patterns during the late early Paleozoic,i.e.,the thrusting deformation followed by sinistral shear deformation.
        The Jiangshan-Shaoxing tectonic zone was the northeastern boundary between the Yangtze Block and the Cathaysia Block during the Neoproterozoic and was an intracontinental orogenic belt during late of the early Paleozoic.In this tectonic zone,there develops a lot of mylonite underwent strong ductile deformation and schist,gneiss,and amphibolite with medium and high grade metamorphism which was formed during the late of early Paleozoic.The research of geometry and kinematic of ductile deformation in Jiangshan-Shaoxing tectonic zone is very important to reveal the tectonic process of intracontinental orogeny.This paper uses the anisotropy of magnetic susceptibility(AMS)to determine the ductile deformation geometry and kinematic of Jiangshan-Shaoxing tectonic zone combing with the field survey.In this study,190 specimens of 19 locations and 221 specimens of23 locations from Wangjiazhai section and Lipu-Sizhai section were analyzed.The magnetic foliation over magnetic lineation in both Wangjiazhai and Lipu-Sizhai sections together with the field observations indicated a compressional deformation pattern.3 and 4 strong ductile deformation zones can be established in the Wangjiazhai section and the Lipu-Sizhai section,respectively.According to the magnetic fabric and petro-fabric studies,the Northeastern Jiangshan-Shaoxing tectonic zone suffered two kinds of deformation patterns during the late early Paleozoic,i.e.,the thrusting deformation followed by sinistral shear deformation.
引文
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