Fossilized silica diagenetic fronts: Implications for palaeoceanographic evolution across the Falkland/Malvinas plateau

A set of newly collected 2D seismic reflection data allows the mapping two distinct cross-cutting reflectors across Falkland/Malvinas Plateau. Reflector XR-F/MB in Basin appears as a bottom simulating reflector that mimics geometry present seafloor, whereas XR-F/MT Trough is non-bottom shallower representing Early-Middle Miocene unconformity. The discordant these with respect to host-stratigraphy argued be associated Opal-A Opal-CT diagenesis, which primarily function temperature. However, estimated temperature at depth for lies below minimum onset silica diagenesis. Based on their and characteristics, are interpreted fossilized diagenetic fronts, formed under palaeo-thermal conditions different from today. We hypothesize erosional action intensified deep water masses subsequent Antarctic glaciations during may have driven fossilization front study area. It erosion 270 m overburden would account drop driving fron.