The recently discovered massive and stockwork sulphide mineralization of Semblana-Rosa Magra and Monte Branco, situated ESE of the Neves–Corvo volcanogenic massive sulphide (VMS) deposit in the Iberian Pyrite Belt (IPB) is presented. Geological setting and tectonic model is discussed based on proxies such as palynostratigraphy and U–Pb zircon geochronology. The mineralization is found within the IPB Volcano-Sedimentary Complex (VSC) Lower sequence, which includes felsic volcanic rocks (rhyolites) with U–Pb ages in zircons of 359.6 ± 1.6 Ma, and black shales of the Neves Formation of late Strunian age. Massive sulphides are enveloped by these shales, implying that felsic volcanism, mineralization and shale sedimentation are essentially coeval. This circumstance is considered highly prospective, as it represents an important exploration vector to target VMS mineralization across the IPB, in areas where the Lower VSC sequence is present. The Upper VSC sequence, with siliciclastic and volcanogenic sedimentary rocks of middle–late Visean age, shows no massive mineralization but a late Tournaisian (350.9 ± 2.3 Ma) volcanism with disseminated sulphides was also identified. Nevertheless, stratigraphic palynological gaps were found within the Strunian and in the Tournaisian sediments, between the Lower and Upper VSC sequences, reflecting probable erosion and uplift mechanisms linked with extensional tectonics. The Semblana and Monte Branco deposits and the Rosa Magra stockwork are enclosed by tectonic sheets that dismembered the VSC sequence in a fold-and-thrust tectonic complex, characteristic of the NE Neves–Corvo region. The methodologies used allow a geological comparison between Neves–Corvo and other IPB mine regions such as Lousal–Caveira, Herrerias, Tharsis and Aznalcollar.

中文翻译：

---

葡萄牙伊比利亚黄铁矿带 Neves-Corvo 矿区的 Semblana、Rosa Magra 和 Monte Branco 最近发现的块状和网状硫化物矿化的地质情况

介绍了最近发现的 Semblana-Rosa Magra 和 Monte Branco 的块状和网状硫化物矿化，位于伊比利亚黄铁矿带 (IPB) 内维斯-科尔沃火山成因块状硫化物 (VMS) 矿床的 ESE。基于孢粉地层学和 U-Pb 锆石年代学等代理方法讨论了地质背景和构造模型。该矿化位于 IPB 火山沉积复合体 (VSC) 下层序列内，其中包括锆石中 U-Pb 年龄为 359.6 ± 1.6 Ma 的长英质火山岩（流纹岩）和斯特鲁尼晚期 Neves 组的黑色页岩。这些页岩包裹着大量的硫化物，这意味着长英质火山活动、矿化和页岩沉积基本上是同时发生的。这种情况被认为是很有前景的，因为它代表了一个重要的勘探载体，目标是跨 IPB 的 VMS 矿化，在较低 VSC 序列存在的地区。上 VSC 层序具有中晚期 Visean 时代的硅质碎屑和火山成因沉积岩，没有显示出大规模的矿化作用，但也发现了具有浸染硫化物的 Tournaisian 晚期（350.9 ± 2.3 Ma）火山作用。然而，在 Strunian 和 Tournaisian 沉积物中，在下 VSC 层序和上层 VSC 层序之间发现了地层孢粉间隙，这反映了与伸展构造相关的可能的侵蚀和抬升机制。Semblana 和 Monte Branco 矿床以及 Rosa Magra 网状结构被构造片所包围，这些构造片在褶皱和逆冲构造复合体中肢解了 VSC 序列，这是 NE Neves-Corvo 地区的特征。