The Ossa-Morena Zone in Iberia, and equivalent terranes in northern France and Central Europe, are thought to be paleogeographically linked to the West African Craton at Ediacaran to early Paleozoic times. Evidence is mainly based on metasedimentary rock detrital zircon age spectra, characterized by two dominant populations of Paleoproterozoic and Cryogenian-Ediacaran ages, with a systematic lack of late Stenian – early Tonian zircon grains. We report here U-Pb-Hf results on detrital zircon grains from six Ordovician-Devonian metasedimentary rocks from the Ossa-Morena Zone. In addition to the Cryogenian-Ediacaran and Paleoproterozoic populations already recognized in previous studies on uppermost Ediacaran and lower Cambrian rocks, the samples ubiquitously show a late Stenian – early Tonian population centered at ≈1 Ga and representing ≈20% of the concordant dates. The εHf versus age plot of the studied samples mainly depicts two vertical arrays corresponding to the Cryogenian-Ediacaran and Stenian-Tonian detrital zircon populations, which spread from εHf values of ≈10 down to ≈−20. The detrital zircon age distribution and Hf isotope signature of the studied rocks point to the Sahara metacraton as the most plausible sediment source. The eastward translation of the continental ribbon represented by the Ossa-Morena Zone and equivalent domains of the Variscides from an original position close to the West African Craton to an Ordovician-Devonian location close to the Sahara metacraton probably occurred at latest Ediacaran – earliest Cambrian times in a dextral strike-slip tectonic setting that post-dated Pan-African collision and Cadomian subduction.

伊比利亚的Ossa-Morena地带，以及法国北部和中欧的同等地层，被认为与古生代在Ediacaran的西非克拉通有古地理联系。证据主要基于准沉积岩碎屑锆石的年龄谱，其特征是古元古代和低温-埃迪卡拉纪的两个主要种群，系统性地缺乏后期的Stenian – Tonian早期的锆石晶粒。我们在这里报告了来自Ossa-Morena地带的6个奥陶纪-德文统准沉积岩碎屑锆石中U-Pb-Hf的结果。除了先前的研究中已经认识到的最上层的埃迪卡拉碳酸盐岩和下寒武纪岩石上的低温-埃迪卡拉碳酸盐岩和古元古代种群外，这些样本无处不在地显示出Stenian晚期至Tonian早期的人口，其中心为≈1Ga，约占一致日期的20％。εHf与研究样本的年龄关系图主要描绘了两个垂直阵列，分别对应于Cryoogenian-Ediacaran和Stenian-Tonian碎屑锆石种群，其分布范围从≈10的εHf值降低至≈-20。研究岩石的碎屑锆石年龄分布和Hf同位素特征表明，撒哈拉大克拉通是最可能的沉积物来源。由Ossa-Morena区域和Variscides的等价区域代表的大陆带从原始位置向西平移，最早发生在西非克拉通的最早位置，最早发生在西非克拉通时代，该位置最早发生在西非克拉通附近。发生在泛非碰撞和Cadomian俯冲之后的右旋走滑构造背景中。