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地温计在桂东南韧性剪切带花岗质糜棱岩中的适用性
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Abstract:
研究区位于云开地体西北侧，经历了板块俯冲–碰撞和陆内造山过程，构造变形复杂，多种韧性剪切带十分发育。文章对桂东南韧性剪切带区域前人已采集的花岗质糜棱岩样品数据进行讨论，利用白云母钛温度计和黑云母钛温度计获得的温度值分别为478℃~615℃和539℃~678℃，得出桂东南韧性剪切带的平均变形温度在557℃左右。结合运动学和39Ar/40Ar年代学分析，认为桂东南韧性剪切带是印支期印支地块与华南板块汇聚碰撞作用的产物，是古特提斯洋构造演化的一部分。
The study area is located on the northwest side of the Yunkai terrane. It has experienced a long and complex plate subduction-collision and later intracontinental orogenic processes. The tectonic deformation is extremely complex, and various types of ductile shear zones are well developed. This article discusses the data from granite mylonite samples collected by previous researchers in the southeastern Guangxi ductile shear zone. The temperature values obtained using muscovite Ti thermometer and biotite Ti thermometer are 478？C~615？C and 539？C~678？C, respectively. The average deformation temperature of the southeastern Guangxi ductile shear zone is around 557？C. Combined with the analysis of kinematics and 39Ar/40Ar chronology, it is believed that the Rong County shear zone is the product of the convergence and collision of the Indosinian block and the South China plate during the Indosinian period, and is a part of the tectonic evolution of the Paleo-Tethys Ocean.
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