The Ductile Deformation Characteristics of Caledonian Intracontinental Orogeny in the Northeastern Jiangshan‐Shaoxing Tectonic Zone: Insights from Magnetic Fabric Study and Its Geodynamic Implication
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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DOI：
10.1111/1755-6724.12643
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
Gong Genhui;Chen Hanlin;W. Fang;L. Xiubin;Meng Lifeng
中科院分区：
文献类型：
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作者：
Gong Genhui;Chen Hanlin;W. Fang;L. Xiubin;Meng Lifeng
江山—绍兴构造带是新元古代扬子地块与华夏地块的东北边界，是早古生代晚期的陆内造山带。该构造带发育大量韧性变形较强的糜棱岩和早古生代晚期形成的中、重度变质的片岩、片麻岩、角闪岩。江山—绍兴构造带韧性变形的几何学和运动学研究对于揭示陆内造山运动的构造过程具有重要意义。本文利用磁化率各向异性（AMS）结合野外调查确定了江山—绍兴构造带的韧性变形几何和运动学。本研究对王家寨剖面和荔浦—四寨剖面19个地点的190个标本和23个地点的221个标本进行了分析。王家寨剖面和荔浦四寨剖面的磁片理叠加磁线理，结合野外观测，显示出挤压变形模式。王家寨段和荔浦—四寨段可分别建立3个和4个强韧性变形带。根据磁组构和油气组构的研究，江山-绍兴东北部构造带在早古生代晚期经历了逆冲变形和左旋剪切变形两种变形模式。
The Jiangshan‐Shaoxing tectonic zone was the northeastern boundary between the Yangtze Block and the Cathaysia Block during the Neoproterozoic and was an intracontinental erogenic 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 of 23 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.