Abstract Igneous Plumbing Systems in sedimentary basins comprise a complex of interconnected intrusive bodies that lead to volcano formation, though their 3D distribution and dynamics are not fully understood. We characterized the post‐breakup igneous plumbing systems at the Santos and Campos Basins using wells and 3D high‐resolution seismic and magnetic data. Cinder cones were emplaced between the Upper Cretaceous and Paleogene, with an estimated total volume of 44 km 3 . In the Cabo Frio High, volcanoes are located beyond the Eocene continental shelf edge, suggesting a predominantly submarine paleoenvironment. We show evidence of a younger magmatic event in this region, where laccoliths are spatially associated with sills and vents intruding Eocene clinoforms. This is further supported by sill‐complexes and dykes beneath the volcanoes, and hydrothermal vents beneath and above them affecting up to the Paleogene. Altogether, these observations indicate: (a) the recurrence of existing conduits for fluidized material and (b) the key role of sills and dykes within the plumbing system. Igneous features are mostly aligned with the rift‐related faults and positive magnetic lineaments, suggesting a tectonic control over their emplacement. We propose a new conceptual model –HYREFRACT, for understanding the reheating and reactivation of ancient igneous and tectonic structures during subsequent magmatic events. It highlights the role of hydrothermal activity in fracturing overburden rocks, which has implications for reservoir permeability, fluid migration and gas release. Our findings offer insights into the morphology and connectivity of igneous plumbing systems at rifted margins that may serve as an analog for similar systems in basins worldwide.
García et al. (Wed,) studied this question.
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