North-Gondwana – Laurussia dynamic paleogeography challenged by magnetic susceptibility through the Famennian

Large-scale magnetic susceptibility (MS) variations in ancient sediments are usually interpreted as related to sea-level and climate changes affecting the erosional regime amount of detrital input. To constrain such environmental during Famennian, we compared MS records representative sections pelagic limestones (1) Avalonian margin Laurussia [Sessacker (SES) Beringhauser Tunnel (BHT), Rhenish Slate Mountains, Germany] (2) Gondwana terranes [Erfoud (ERF), Tafilalt, Morocco; Col des Tribes (CT), Montagne Noire, France; Buschteich (BU), Thuringia, Germany; Corona Mizziu (CM I, II), Sardinia Pizzul West (PZW) Carnic Alps, Italy]. Very low values throughout Famennian characterize from Avalonia. In contrast, high oscillating early Famennian; they drop significantly all together middle Palmatolepis marginifera Zone match pattern thereafter. evaluate importance partial diagenetic overprint, data were hysteresis parameters geochemical proxies BU, CM II CT. The degree thermal diagenesis is estimates taking into account Color Alteration Indices (CAI) conodonts. Striking dissimilarities between favor for an existing remnant oceanic barrier these continents times, when supplies was obviously different. Uniformity reached after N-Gondwana, barriers could have vanished T-R fluctuations sea-level. All sites remained under a rather similar supply through uppermost Famennian. Comparison trends with conodont biofacies five (CT, SES) allows emphasizing concordance their relationship sea level fluctuations.