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Peculiar magmatic rocks were erupted and emplaced at depth at the margin of the Gondwana supercontinent during the Cambro-Ordovician transition. These rocks are characterized by high contents in silica and iron but they do not have equivalents in the high-silica members of the calc-alkaline series. They have particular geochemical signatures, with Al saturation index, ASI >1, FeO>2.5 wt.%, MgO>0...
One of the most intriguing characteristics of the northern (Iberia) and southern (Puna) Gondwana margins is the presence of large volumes of Late Cambrian–Early Ordovician magmatic rocks with ferrosilicic composition, i.e., rocks with high iron and silica contents (FeO>4.0 wt.%, SiO>63 wt.%) for very low contents in calcium (CaO<1.5 wt.%). Geological and geochemical features, as well as experimental...
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