Strike-Slip tectonics along the Tan-Lu fault system, East Asia

郯庐断裂系是东亚最大的走滑断裂。我们从1995年开始从山东到广东进行调查。(1)基于下白垩统至上白垩统地层（红砂岩和粉砂岩）的古地磁分析，反演结果表明浙中沿郯庐断裂体系与华南地块其他区域存在逆时针旋转。早白垩世的平均VGP位置比晚白垩世变化更大。(2)郯庐断裂带以左侧走滑运动为主；即，左行阶梯形褶皱，不对称的小构造和几乎水平的条纹。(3)山东郯庐断裂带断裂岩主要由断裂角砾岩和碎裂岩组成，不含糜棱岩。第三系玄武岩被断岩覆盖，但不受郯庐断裂带F_3主断裂的切割。(4)马zhan盆地早白垩世（82Ma FT锆石年龄）沉积中心与主断裂走向平行迁移。综上所述，郯庐断裂体系在晚白垩世期间水平运动，沿其主断裂的释放弯处形成拉分盆地，主要受走滑运动的影响。

The Tancheng-Lujiang (Tan-Lu) fault system is the biggest strike-slip fault in East Asia. We have been investigating it from Shandong to Guangdong since 1995. The following results were obtained : (1) The resultant VGPs suggest that the central Zhejian along the Tan-Lu fault system has a counterclockwise rotation against the other regions in the Huanan block, based on paleomagnetic analysis of the Lower to Upper Cretaceous strata (red sandstones and siltstones). The mean VGP position of the Early Cretaceous is more variable than that of the Late Cretaceous. (2) There is evidence for a predominant left-lateral strike-slip movement along the Tan-Lu fault zone ; i.e., left-hand en echelon folds, asymmetrical minor structures and almost-horizontal striations. (3) The fault rock of the Tan-Lu fault zone in Shandong Province is composed mainly of fault breccia and cataclasite, but not mylonite. The Tertiary basalt covers with the fault rock, but is not cut by the main fault F_3 of the Tan-Lu fault zone. And (4) The depocenter of the Early Cretaceous (82Ma FT zircon age) Mazhan basin migrates parallel to the strike of the main fault. Judging from the above-noted features, it is concluded that the Tan-Lu fault system moved horizontally during the Late Cretaceous, and the pull-apart basin was formed at the releasing bend along its main fault due to the strike-slip movement.