Abstract The Shandong Peninsula in the eastern North China Craton (NCC) forms part of the region that witnessed extensive tectonic reactivation with concomitant craton destruction and lithospheric thinning during the Meso-Cenozoic. Previous studies concentrated mainly on the timing, mechanism and tectonic setting of the Meso-Cenozoic magmatism, with inadequate evidence from low temperature thermochronology to constrain the thermo-tectonic exhumation history of this region. In this study, we present new apatite U Pb (AUPb) and fission track (AFT) data with corresponding thermal history models for igneous rocks from the two flanks of the Tan-Lu Fault Zone (TLFZ) that bisects the Shandong Peninsula, with a view to gain insights into the Meso-Cenozoic exhumation history of this region and to evaluate its implications on the lithospheric destruction of the NCC. The newly obtained AUPb ages of 2.5–1.5 Ga for the Precambrian intrusive rocks and of 162–112 Ma for the Mesozoic igneous suite are mainly used to constrain their thermal history models. In addition, the Mesozoic AUPb ages of 162–112 Ma highly overlap with their corresponding zircon U Pb ages (161–115 Ma), suggesting shallow granitoid emplacement and associated rapid post-magmatic cooling in response to the westward subduction of the Paleo-Pacific Plate. The AFT dating results yield two groups of AFT central ages at 122–113 Ma and 98–59 Ma, and corresponding thermal history models also reveal two rapid cooling stages during the Early Cretaceous (130–105 Ma) and Late Cretaceous to Paleogene (85–55 Ma). By integrating previous low temperature thermochronological studies with this study, we interpret that the Early Cretaceous rapid exhumation corresponds to the peak timing of craton destruction, resulting from the Paleo-Pacific slab rollback within a back-arc extensional setting. The Late Cretaceous rapid exhumation is interpreted as a response to continuing craton destruction, derived by the NNW-directed Pacific Plate subduction. The Paleogene cooling might represent the termination of craton destruction of Shandong Peninsula associated with a dextral motion along the TLFZ, triggered by the change in direction of the Pacific Plate from NNW to WNW and/or far-field effect of the India-Eurasia collision.

中文翻译：

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华北克拉通东部山东半岛中新生代多次折返：对岩石圈破坏的意义

摘要 位于华北克拉通东部的山东半岛是中新生代大规模构造再活化、克拉通破坏和岩石圈减薄区域的一部分。以往的研究主要集中在中新生代岩浆活动的时间、机制和构造背景上，低温热年代学证据不足以限制该地区的热构造剥露历史。在这项研究中，我们提供了新的磷灰石 U Pb (AUPb) 和裂变径迹 (AFT) 数据以及来自将山东半岛一分为二的郯庐断裂带 (TLFZ) 两侧的火成岩的相应​​热历史模型，以深入了解该地区的中新生代剥蚀历史，并评估其对 NCC 岩石圈破坏的影响。新获得的前寒武纪侵入岩的 AUPb 年龄为 2.5-1.5 Ga，中生代火成岩套件的 AUPb 年龄为 162-112 Ma，主要用于约束它们的热历史模型。此外，162-112 Ma的中生代AUPb年龄与其对应的锆石U Pb年龄（161-115 Ma）高度重叠，表明浅花岗岩侵位和相关的快速后岩浆冷却响应古太平洋向西俯冲盘子。AFT 测年结果产生了 122-113 Ma 和 98-59 Ma 的两组 AFT 中心年龄，和相应的热历史模型还揭示了早白垩世（130-105 Ma）和晚白垩世至古近纪（85-55 Ma）的两个快速冷却阶段。通过将先前的低温热年代学研究与本研究相结合，我们解释说早白垩世的快速剥脱对应于克拉通破坏的高峰时间，这是由弧后伸展环境中的古太平洋板块回滚引起的。晚白垩世的快速剥露被解释为对由 NNW 导向的太平洋板块俯冲产生的持续克拉通破坏的反应。古近系冷却可能代表山东半岛克拉通破坏的终止，与沿 TLFZ 的右旋运动有关，