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郯庐断裂带起源机制的探讨 预览 被引量:3

Discussion on Initial Mechanism of the Tan-Lu Fault Zone
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摘要 为探讨郯庐断裂带的起源方式,对其印支期变形构造进行了详细的构造研究与综合分析。张八岭隆起带上张八岭群及肥东杂岩表现为上盘向南南西运动的平缓韧性滑脱变形带;庐江地区张八岭群表现为郯庐陡立的左行走滑剪切带;大别造山带东缘郯庐剪切带经历了两期变形事件,早期变形表现为北东走向左行走滑韧性剪切带,而晚期变形为叠加的北东-南西向紧闭褶皱;大别造山带内宿松杂岩及造山带南缘张八岭群表现为折返构造特征。结合前人白云母^40Ar/^39Ar定年结果及郯庐断裂带周缘前陆变形带特征,提出了郯庐断裂带起源的板片撕裂断层模式。 The Dabie and Sulu orogens between the North China and the Yangtze cratons were left-laterally offset about 400km along the NE-striking Tan-Lu Fault Zone.The fault zone terminates abruptly at the southeastern corner of the Da-bie Orogen,suggesting unique origin of the fault zone which remains controversial.Structures in the Zhangbaling Group and Feidong Complex in the Zhangbaling Uplift formed in a flat-lying ductile detachment zone with a shear sense of top to the SSW.Whereas,the Tan-Lu shear zone in the Lujiang area exhibits as a sinistral ductile shear zone.Thus,the Tan-Lu Fault Zone in the east of the Dabie Orogen experienced two phases of deformation.The first phase deformation exhibits as sinistral ductile shear belts,the sinistral ductile shear zone was then involved in the NE-SW trending tightly folds and thrusts deformation.The Susong Complex and Zhangbaling Group in the Dabie Orogens exhibit as exhumation structures. According previous muscovite ^40Ar/^39Ar ages and deformation of syn-collisional folds and thrusts,we propose an indenta-tion-induced continent-tearing model for the initialization the Tan-Lu Fault Zone.
作者 赵田 朱光 向必伟 林少泽 顾承串 ZHAO Tian1,2, ZHU Guang2 , XIANG Bi-wei1 , LIN Shao-ze2,3 ,GU Cheng-chuan2 ( 1. School of Resources and Environment Engineering, Anhui University, Hefei 230039, China; 2. School of Resources and Environment Engineering, Hefei University of Technology, Hefei 230009, China 3. School of Civil Engineering, Chongqing University; Chongqing 400044, China)
出处 《矿物岩石地球化学通报》 CAS CSCD 北大核心 2016年第6期1120-1140,共21页 Bulletin of Mineralogy Petrology and Geochemistry
基金 国家自然科学基金项目(41472194,41472186)
关键词 郯庐断裂带起源 张八岭群 左行走滑剪切带 中三叠世 板片撕裂断层 the Tan-Eu Fault Zone Zhangbaling Group sinistral shear zone Middle Triassic slab tearing fault.
作者简介 第一作者简介:赵田(1989-),男,博士,讲师,从事断裂带构造变形研究.E—mail:zhaotian323@163.com.
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