| 赣北景德镇韧性剪切带两类剪切指向及其构造意义 |
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| 引用本文： | 徐先兵,汤帅,林寿发.赣北景德镇韧性剪切带两类剪切指向及其构造意义[J].高校地质学报,2016,22(2):308. |
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| 作者姓名： | 徐先兵 汤帅 林寿发 |
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| 摘 要： | 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。
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| 关 键 词： | 运动学指向 温压条件 景德镇韧性剪切带 江南造山带 华南 |
Two kinds of Shear Senses and Tectonic Implication of the Jingdezhen Ductile Shear Zone,Northern Jiangxi Province |
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| XU Xianbing,TANG Shuai,Lin Shoufa.Two kinds of Shear Senses and Tectonic Implication of the Jingdezhen Ductile Shear Zone,Northern Jiangxi Province[J].Geological Journal of China Universities,2016,22(2):308. |
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| Authors: | XU Xianbing TANG Shuai Lin Shoufa |
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| Abstract: | 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 |
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| Keywords: | kinematic indicator temperature-pressure condition Jingdezhen ductile shear zone Neoproterozoic Jiangnan Orogen South China Block |
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