郯庐断裂系的北延及地质-地球物理特征

North-extension of the Tanlu fracture and geologic-geophysical characteristics

郯庐断裂系的北延 (东北部分 )的性质及形成机制是东北东部重大基础地质和应用地质研究的重点课题之一。通过对其地质 -地球物理特征的综合研究 ,我们认为 :以抚顺—密山断裂带、伊通—依兰断裂带为骨干 ,长春—哈尔滨 (四平—德惠 )断裂带、东吴—昌图断裂带、新民—康平、洮安—阿荣旗断裂为主要成员的东北东部平移断裂系 ,均可包括在郯庐断裂系北延的“大家庭”中。从晚三叠始 ,随着中生代走滑—拉分张裂型火山沉积盆地的“开合”运动 ,东北东部的平移断裂系历经了 3个构造阶段、 8个地史时期的平移活动 ,并与斜冲运动发生多次更叠。其成因机制受控于泛太平洋板块相对欧亚板块的运动方式和速率的变更。

The character of the north-extension of the Tanlu fracture system (the northeast part) and its deformational mechanism is one of the priority subject of study for the foundamental geology and practical geology in the eastern part of Northeast China. Through the study of geologic-geophysical characteristics, it is considered that Fusun-Mishan faulted zone is dominant, Yitong-Yilan, Changchun-Harbin (Siping-Dehui) and Xinmin-Kangping- Tao'an -Arong Banner faulted zones are main wrench faulted systems of the eastern part of the Northeast China, which can be included in a “large family” of the north-extensional Tanlu fracture system. From the late Triassic period, with the “open-close movement” of the Mesozoic strike-slip-pull-apart type volcanic sedimentary basin, the wrench faulted system of the eastern part of the Northeast China occurred as three tectonic stages and eight wrench movements with multiple obliquely superimposed tectonism. Its origin mechanism is controlled by the form of motion of the Pan-Pacific facing the Eurasian plate and its speed change.