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地质论评  2009 

安徽绩溪伏岭岩体隆升时代的磷灰石裂变径迹证据

Keywords: 裂变径迹年龄,隆升速率,冷却剥露历史,伏岭岩体。

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Abstract:

安徽绩溪伏岭岩体位于安徽省南部、黄山花岗岩体的东部。伏岭岩体裂变径迹(AFT)热年代分布于51±5~68±7Ma之间,围限径迹长度为11.9~12.9μm。岩体形成之后,所在山系经历了速率波动较大的隆升过程,至55Ma期间为一加速隆升过程,到55Ma时速度达到最大的73mm/ka;随后速度减缓,54Ma左右时的平均抬升速率为60mm/ka;54~51Ma间又是一个快速加速隆升时期,到51Ma时,速度达到70mm/ka。研究区具有三个主要的冷却剥露阶段:130~116Ma左右,冷却速率约为1.34℃/Ma;70~60Ma左右,进入第二个较为快速冷却阶段,冷却速率约为2?5℃/Ma;在7~8Ma左右发生突然加剧冷却事件,持续至今,速率达到8℃/km。总体来说,伏岭岩体经历了速率逐渐增加的冷却过程。由于黄山山体与伏岭岩体在大地构造位置、岩性特征及侵入时间上具有很大的相似性,二者的隆升时代、速率以及抬升剥蚀量是大致相当的。

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