Geochronological constraints on Caledonian strike–slip displacement in Svalbard, with implications for the evolution of the Arctic

Geochronological constraints on Caledonian strike–slip displacement in Svalbard, with implications for the evolution of the Arctic
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斯瓦尔巴群岛加里东走滑位移的年代学限制,对北极演化的影响

DOI:
10.1111/ter.12461
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发表时间:
2020
期刊:
影响因子:
2.4
通讯作者:
Strauss, Justin V.
Strauss, Justin V.
中科院分区:
地球科学3区
文献类型:
--
作者:
Faehnrich, Karol;Majka, Jarosław;Schneider, David;Mazur, Stanisław;Manecki, Maciej;Ziemniak, Grzegorz;Wala, Virginia T.;Strauss, Justin V.

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斯瓦尔巴群岛的组装时间与波罗的海和劳伦大陆之间的中古生代加里东碰撞仍然存在争议。斯瓦尔巴群岛由三个基底省组成,边界为南北走向的走滑断层,其位移历史知之甚少。在这里,我们报告的显微结构和矿物化学数据与40 Ar/39 Ar白云母地质年代学集成从左维姆索登-科西帕塞特剪切带(VKSZ,斯瓦尔巴群岛西南),并探讨其与邻近的结构和区域变形在环北极地区的关系。我们的研究结果表明,沿着VKSZ的走滑位移发生在晚志留世-早泥盆世,与格陵兰和斯堪的纳维亚大陆碰撞主阶段的开始以及斯瓦尔巴群岛北方志留世-泥盆纪断层控制盆地的同造山沉积的开始是同时的。这些新的年龄限制突出了加里东造山带的逃逸构造与穿过劳伦大陆北方边缘的中古生代火山岩转移之间的可能联系。
The timing of Svalbard's assembly in relation to the mid‐Paleozoic Caledonian collision between Baltica and Laurentia remains contentious. The Svalbard archipelago consists of three basement provinces bounded by N–S‐trending strike–slip faults whose displacement histories are poorly understood. Here, we report microstructural and mineral chemistry data integrated with40Ar/39Ar muscovite geochronology from the sinistral Vimsodden‐Kosibapasset Shear Zone (VKSZ, southwest Svalbard) and explore its relationship to adjacent structures and regional deformation within the circum‐Arctic. Our results indicate that strike–slip displacement along the VKSZ occurred in late Silurian–Early Devonian and was contemporaneous with the beginning of the main phase of continental collision in Greenland and Scandinavia and the onset of syn‐orogenic sedimentation in Silurian–Devonian fault‐controlled basins in northern Svalbard. These new‐age constraints highlight possible links between escape tectonics in the Caledonian orogen and mid‐Paleozoic terrane transfer across the northern margin of Laurentia.
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