K–Ar illite and apatite fission track constraints on brittle faulting and the evolution of the northern Norwegian passive margin
K–Ar illite and apatite fission track constraints on brittle faulting and the evolution of the northern Norwegian passive margin
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DOI：
10.1016/j.tecto.2013.09.035
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发表时间：
2013-11
期刊：
影响因子：
2.9
通讯作者：
C. Davids;K. Wemmer;H. Zwingmann;Fabian Kohlmann;J. Jacobs;S. Bergh
中科院分区：
文献类型：
--
作者：
C. Davids;K. Wemmer;H. Zwingmann;Fabian Kohlmann;J. Jacobs;S. Bergh
确定挪威北方后加里东期脆性断裂活动的发生时间，对于了解挪威北部大陆边缘的伸展构造演化具有重要意义。挪威北方特罗姆和Vesterålen地区的断层泥分别给出了石炭纪至二叠纪和石炭纪至白垩纪的K-Ar伊利石年龄。结果表明，特罗姆和韦斯特哈伦地区之间的断层活动和折返形成对比：虽然特罗姆地区的主要断层似乎在二叠纪断层事件后停止，但韦斯特哈伦地区的断层至少持续到白垩纪。研究结果突出了广泛的二叠纪构造事件的重要性，其次是一个明显的后二叠纪构造活动的挪威北部被动边缘的西南迁移。晚三叠世至早侏罗世磷灰石裂变径迹年龄在特罗姆的主要断裂带之间没有显示出显著的年龄偏移，表明大部分或全部断裂活动发生在晚三叠世之前。热历史模型是一致的，表明在晚二叠世-三叠纪持续冷却至约60 °C。
Determining the timing of post-Caledonian brittle faulting in northern Norway is important for the understanding of the extensional tectonic evolution of the north Norwegian continental margin. Fault gouges from the Troms and Vesterålen regions of northern Norway yield Carboniferous to Permian and Carboniferous to Cretaceous K–Ar illite ages, respectively. The results show a contrast in fault activity and exhumation between the Troms and the Vesterålen regions: while major faulting in the Troms region appears to have ceased after the Permian faulting event, faulting continued into at least the Cretaceous in the Vesterålen region. The findings highlight the importance of a widespread Permian tectonic event followed by a distinct southwestward migration of post-Permian tectonic activity on the north Norwegian passive margin. Late Triassic to Early Jurassic apatite fission track ages do not show significant age offsets across major fault zones in Troms, indicating that most or all of fault activity took place prior to the Late Triassic. The thermal history models are consistent and indicate continuous cooling to about 60 °C in the Late Permian–Triassic.