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大别造山带早白垩世抬升演化研究——来自岩体侵位深度的证据

, PP. 200-212

Keywords: 大别造山带,北大别杂岩带,早白垩世岩体,角闪石铝压力计

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Abstract:

?北大别杂岩带是大别造山带内出露面积最大的构造-岩石单元,记录了造山后的构造活动信息.为了探讨大别造山带造山后的抬升演化过程及机制,本次工作在北大别杂岩带内具有精确锆石U-Pb年龄结果的岩体中采集了一系列花岗岩、花岗闪长岩、闪长岩和碱长花岗岩样品,在其中挑选角闪石进行电子探针分析,将分析结果利用角闪石Al压力计进行计算.分析结果显示,角闪石中总铝含量(p.f.u.)几乎全部介于1.17~1.97,XFe值在总铝含量大于1.17的样品中几乎全部介于0.4~0.65,由此计算出的压力值主要介于256.8~676.2MPa.虽然早白垩世的主要隆升机制仍是伸展作用,但岩体侵位导致的局部不均匀抬升也具有重要作用.根据岩体120Ma以来的埋藏深度分布,可以得出造山带在此时间以来表现为地垒-地堑式隆升.

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