Detrital zircon provenance studies of Mesoproterozoic basement and overlying Old Red Sandstone strata in northwestern Svalbard, Arctic Norway, were conducted to test competing models for Caledonian paleogeography and tectonics and constrain the magnitude of orogen-parallel, Silurian to Devonian strike-slip faulting following the Laurentia-Baltica collision. Mesoproterozoic basement strata, cut by earliest Tonian orthogneiss units, mostly yielded 1640–1050 Ma detrital zircon populations that are consistent with pre-Caledonian locations near northeast Greenland. Basal Old Red Sandstone deposits that filled pull-apart basins showed basement-derived signatures but also contained 530–450 Ma and 670–570 Ma populations with slightly subchondritic (ε Hf[t] = –4 to –2) Hf isotope compositions. These results are consistent with late Silurian–Early Devonian proximity to the northeast Greenland Caledonides and Pearya, which indicates limited (<200 km) strike-slip displacement of Svalbard’s Caledonian allochthons after the Laurentia-Baltica collision. Previously interpreted connections between the Svalbard Old Red Sandstone and British Caledonides are incompatible with these detrital zircon results. Lochkovian Old Red Sandstone strata were deposited after a second episode of strike-slip faulting and show recycled basement signatures. The lack of 530–450 Ma and 670–570 Ma populations suggests that the second deformation episode reorganized local drainages. Pragian–Givetian strata have provenance from local Old Red Sandstone sources that were uplifted during a third and final episode of strike-slip deformation. The results indicate that northern Caledonian (Svalbard, Pearya) crustal evolution was characterized by the reworking of Mesoproterozoic–Paleoproterozoic sources and mostly <600 m.y. crustal residence times, whereas the southern Caledonides (UK, Ireland) show evidence for the reworking of older basement and mostly >600 m.y. crustal residence times.

中文翻译：

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老红砂岩地层的碎屑锆石U-Pb-Hf同位素特征限制了志留纪至泥盆纪古地理，构造学和斯瓦尔巴群岛古苏格兰的地壳演化

在挪威西北部的斯瓦尔巴特群岛西北部的中元古代界和上覆的老红砂岩地层的碎屑锆石物源研究进行了测试，以测试竞争古苏格兰和古构造的模型，并限制了劳伦提亚之后造山带平行，志留纪至泥盆纪走滑断层的强度。 -Baltica碰撞。中古生代基底地层，最早由Tonian正生片岩单元切割而成，主要产生了1640–1050 Ma碎屑锆石，与格陵兰东北部附近的Caledonian位置一致。充满拉断式盆地的基底老红砂岩沉积物显示出基底衍生的特征，但也包含530–450 Ma和670–570 Ma的种群，具有略次软骨性（εHf [t] = –4至–2）Hf同位素组成。这些结果与晚志留纪-早泥盆纪邻近东北格陵兰Caledonides和Pearya的情况一致，这表明在劳伦西亚-巴尔蒂卡碰撞后斯瓦尔巴德群岛的古苏格兰异地层走滑位移有限（<200 km）。先前解释过的斯瓦尔巴德老红砂岩和英属喀里多尼德之间的联系与这些有害的锆石结果不相容。Lochkovian老红砂岩地层是在第二次走滑断层之后沉积的，并显示了再生的基底特征。缺少530–450 Ma和670–570 Ma的种群表明第二次变形事件重新组织了局部排水。Pragian-Givetian地层起源于当地的老红砂岩资源，在走滑变形的第三次也是最后一次发作中被抬升。