This study examines the coastal evolution of Babitonga Bay (northeast Santa Catarina, Brazil) by investigating the architectural stratigraphy using five vibracores and 283 km of high-resolution 2D seismic data (CHIRP 0.7–12.0 kHz). We observe and map five primary stratigraphic units and two sub-units, together representing the rocky basement, and Holocene fluvial, estuarine, and coastal systems, as well as abundant trapped shallow gas. This revealed the isolation of two estuarine systems that were then merged as sea level rose and the valleys drowned. This same phase of rapid sea-level rise led to overstepping and drowning of coastal barrier systems along the inner shelf. Following a relative highstand in sea level during the middle Holocene, coastal processes during slow sea-level fall led to partial infilling of the estuary and moderate reworking of nearshore and coastal deposits. These results show how the geological heritage of Babitonga Bay (a tectonic valley) likely influenced its present morphology.
|Name||Coastal Sediments 2023|
|Publisher||World Scientific Publishing|