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大别山东缘郯庐两期走滑剪切带形成的温压条件与造山带折返的关系

, PP. 228-238

Keywords: 大别山东缘,郯庐断裂带,造山带折返,多硅白云母,温度计

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Abstract:

郯庐断裂带与大别造山带在大别山东缘相复合,并将大别―苏鲁造山带左行错开达500km。本文以大别山东缘为研究背景,通过对郯庐断裂带两期左旋走滑韧性剪切带温压条件的估算及热年代学信息的分析,来探讨大别造山带在早侏罗―早白垩世之间的折返历史与隆升量。通过矿物组合、矿物变形特征以及白云母―绿泥石地质温度计得到郯庐早、晚两期剪切带的形成温度均为400~450℃。通过多硅白云母Si原子数地质压力计计算得到早、晚两期剪切带的形成压力分别为0.25~0.36GPa和0.24~0.39GPa。考虑到剪切摩擦加热和构造超压的影响,笔者推断郯庐两期走滑剪切带形成的最大深度均不超过12km,且两期走滑剪切带的形成深度至多相差1~2km。郯庐断裂带在约190Ma和128Ma经历了两期走滑冷却事件,而在此期间,大别造山带东缘经历了一个构造平静期,基本没有发生隆升。根据郯庐断裂带的信息,造山带在早白垩世的热隆事件中的隆升幅度小于12km。

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