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辽东半岛大营子拆离断层系及其区域构造意义

, PP. 437-451

Keywords: 辽东半岛,拆离断层系,白垩纪伸展作用,岩石圈减薄,华北克拉通

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Abstract:

?华北克拉通晚中生代发生了大规模岩石圈减薄并伴随着地壳层次区域性伸展作用的发生.在此伸展背景下,华北克拉通区发育有一系列的伸展构造,大营子拆离断层系即为一个典型实例、大营子拆离断层系位于华北克拉通东部(辽东半岛东南部),主要由上盘火山-沉积盆地,大营子-黄花甸拆离断层带以及下盘古元古代变质岩系和侵入岩体三部分组成.依据拆离断层带中构造岩组合、构造岩变形显微构造和石英EBSD组构分析揭示出下盘岩石主要经历了从高绿片岩相到低绿片岩相的变形变质过程.基于火山-沉积盆地中火山岩的SHRIMP和LA-ICP-MS锆石U-Pb测年结果,推断伸展构造开始活动于(135±1.2)Ma之前,结束于(127±1)Ma.通过与辽南变质核杂岩及辽东半岛其他伸展构造的对比,以及这些伸展构造的分布及影响深度,可充分说明辽东半岛岩石圈破坏和减薄的不均一性,从而显示出其破坏程度的差异,并藉此探讨了华北克拉通破坏和伸展减薄的不均匀性.

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