Multiple fluid flow events from salt‐related rifting to basin inversion (Upper Pedraforca thrust sheet, SE Pyrenees)

Fluid systems in inverted rifted margins are challenging to interpret because fractures formed before compression were often reactivated acting as fluid pathways new ones formed. Deciphering the fracture and flow history such complex settings has key implications for prediction of distribution mineral resources. As an example, we reconstruct evolution a portion Pyrenean rift, Upper Pedraforca thrust sheet, from Mesozoic extension Alpine orogeny. We combine structural analysis petrographic, geochemical geochronological data obtained 87 samples fracture-filling carbonate cements. During Late Jurassic-Early Cretaceous, low-temperature seawater produced dolomitization Jurassic Lower Cretaceous limestones extensional setting. Early salt-related extension, formation waters, probably evolved or fluids that interacted with Triassic evaporites, at temperatures 125 149°C migrated through fractures. The breccias within post-salt rocks primary weld zones facilitated upward migration waters pre-salt high 87Sr/86Sr ratios. Formation 80°C during emplacement sheet Cretaceous-Palaeocene. These Carbonates and/or evaporites. In contrast, influence meteoric increased shallower positions due exhumation SE Pyrenees Eocene-Oligocene. Coevally, hot dolomitizing along diapir walls secondary welds. Supergene ores documented diapiric areas worldwide related fluids, similar percolation occurred suggest supergene mineralization could be found Pyrenees. Brecciation evaporite detachments, where accumulate basement-derived also suggests