赣北景德镇韧性剪切带两类剪切指向及其构造意义

景德镇韧性剪切带位于新元古代江南造山带的核部，其构造变形特征和形成时代对华南新元古代至早古生代构造演 化具有重要的制约意义。景德镇韧性剪切带呈北东向展布，全长约180 km，最大出露宽度为~7 km。通过详细的野外地质 调查和室内定向薄片鉴定，在景德镇韧性剪切带中识别出了两期韧性走滑构造变形，并研究了其运动学指向和形成时的温 压条件。早期构造变形表现为左旋韧性走滑兼逆冲作用，形成温度为420~530℃，差应力为40~300 MPa；晚期变形主要表 现为右旋走滑，形成温度为300~420℃，差应力为120~350 MPa。结合前人资料，景德镇韧性剪切带左旋走滑兼逆冲作用形 成于新元古代造山作用的晚期（810~800 Ma），是由同造山挤压到后造山伸展调整的结果；而右旋走滑形成于早古生代，是 华南早古生代陆内造山作用的产物。
The Jingdezhen ductile shear zone is located at the core of the Neoproterozoic Jiangnan Orogen. Structural features and geochronology of the Jingdezhen ductile shear zone have a key implication for the Neoproterozoic to Early Paleozoic tectonic evolution of the South China Block. The Jingdezhen ductile shear zone is ~180 km long in the NE-striking orientation and ~7 km in maximum width. Two-phase ductile strike-slip shearing was identified based on detailed field investigation and observation of oriented thin sections. Moreover, the kinematic indicators and temperature-pressure conditions were studied in this paper. The early sinistral ductile strike-slip with thrusting occurred at 400~500℃ and differential stress of 40~300 MPa, whereas the dextral ductile shearing at 300~400℃ and differential stress of 120~300 MPa. Combined with the previous work, the sinistral strike-slip with thrusting of the Jingdezhen ductile shear zone took place at late stage of the Neoproterozoic orogen in the South China Block (810~800 Ma), as a result of transformation from syn-orogeny compression to post-orogeny extension. The dextral shearing of the Jingdezhen ductile shear zone occurred in the Early Paleozoic, triggered by the Early Paleozoic intracontinental orogeny of southeast China