The Ossa-Morena Zone (OMZ) has a complex geological history including both Cadomian and Variscan orogenic events. Therefore, the OMZ plays an important role in understanding the geodynamic evolution of Iberia. However, the P–T–t evolution of the OMZ is poorly documented. Here, we combine structural and metamorphic analyses with new geochronological data and geochemical analyses of mafic bodies in Ediacaran metasediments (in Iberia known as Série Negra) to constrain the geodynamic evolution of the OMZ. In the studied mafic rocks, two metamorphic stages were obtained by phase equilibria modelling: (1) a high-pressure/low-temperature event of 1.0 ± 0.1 GPa and 470–510 °C, and (2) a medium-pressure/higher-temperature event of 0.6 ± 0.2 GPa and 550–600 °C. The increase in metamorphic temperature is attributed to the intrusion of the Beja Igneous Complex (around 350 Ma) and/or the Évora Massif (around 318 Ma). New U–Pb dating on zircons from the mafic rocks with tholeiitic affinity yields an age between 815 and 790 Ma. If the zircons crystallised from the tholeiitic magma, their age would set a minimum age for the pre-Cadomian basement. The ca. 800 Ma protolith age of HP-LT tholeiitic dykes with a different metamorphic history than the host Série Negra lead us to conclude that: (1) the HP-LT mafic rocks and HP-LT marbles with dykes were included in the Ediacaran metasediments as olistoliths; (2) the blueschist metamorphism is older than 550 Ma (between ca. 790 Ma and ca. 550 Ma, e.g., Cadomian).

Ossa-Morena Zone (OMZ) 具有复杂的地质历史，包括 Cadomian 和 Variscan 造山事件。因此，OMZ 在了解伊比利亚的地球动力学演化方面发挥着重要作用。然而，P-T-tOMZ 的演变记录很少。在这里，我们将构造和变质分析与埃迪卡拉纪变沉积岩（在伊比利亚称为 Série Negra）中基性体的新地质年代学数据和地球化学分析相结合，以限制 OMZ 的地球动力学演化。在研究的镁铁质岩石中，通过相平衡模型获得了两个变质阶段：（1）1.0 ± 0.1 GPa 和 470-510 °C 的高压/低温事件，以及（2）中压/更高- 0.6 ± 0.2 GPa 和 550–600 °C 的温度事件。变质温度的升高归因于 Beja Igneous Complex（约 350 Ma）和/或 Évora Massif（约 318 Ma）的侵入。新的 U-Pb 年龄对来自具有拉斑亲和性的镁铁质岩石的锆石产生的年龄在 815 到 790 Ma 之间。如果锆石从拉斑岩浆中结晶出来，他们的年龄将为前 Cadomian 地下室设定最低年龄。约。变质历史与寄主 Série Negra 不同的 HP-LT 拉斑岩脉的 800 Ma 原岩年龄使我们得出结论：（1）HP-LT 基性岩和带脉的 HP-LT 大理岩作为滑石包含在埃迪卡拉纪变质沉积物中; (2) 蓝片岩变质作用年龄大于 550 Ma（在约 790 Ma 和约 550 Ma 之间，例如 Cadomian）。