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在哀牢山-红河剪切带的元阳到者龙的6个不同地点,对18个变质岩样品进行系统分析钾长石的~(40)Ar-~(39)Ar年龄。发现用MDD模式得到的18条冷却曲线(温度范围在400-150℃之间)均存在一次(或两次)快速冷却过程(冷却速度>100°C/Ma),这种快速冷却(抬升)过程不仅反映了该剪切带在大约25-17Ma时,韧性走滑作用结束和正断作用的开始,而且它的起始时间还有自东南向西北逐渐变新的趋势。利用6个不同地点快速冷却(抬升)的起始时间与相对距离作图时,得到了较好的线性函数关系(斜率为34mm/a)。并对这种函数关系进行了两种可能的构造解释。
A systematic analysis of ~ (40) Ar- ~ (39Ar) ages of potash feldspar was performed on 18 metamorphic samples from 6 sites in Yuanyang-Honghe shear zone of the Ailao-Red River shear zone. The rapid cooling (up to 100 ° C / Ma) of the 18 cooling curves (in the temperature range between 400-150 ° C) found in MDD mode was found (one time or twice) The process not only reflects the end of ductile strike-slip and the beginning of normal-fault of this shear zone at about 25-17Ma, but also its starting time gradually changes from southeast to northwest. A good linearity function (slope of 34 mm / a) was obtained when plotting the initial cooling-up (lifting) of 6 different locations relative to the relative distance. Two possible construct explanations of this kind of functional relationship are also given.