Dating the Northwest Shelf of Australia Since the Pliocene

Accurate dating of marine sediments is essential to reconstruct past changes in oceanography and climate. Benthic foraminiferal oxygen isotope series from such record long-term global ice volume deep-water temperature. They are commonly used the Plio-Pleistocene correlate deep ocean records construct age models. However, continental margin settings often display much higher sedimentation rates due variations regional depositional setting local input sediment. Here, it necessary create a multi-site framework allow precise strata. We high-resolution determine ages events for Northwest Shelf (NWS) Australia, which was cored by International Ocean Discovery Program (IODP) Expedition 356. employ benthic carbon isotopes an astronomically-tuned model IODP Site U1463 (5.16–1.69 Ma). The applied downhole-logging natural gamma radiation (NGR) depth-series, then correlated NGR depth-series several sites industry wells area. This approach allows assigning seismic reflectors timing key climate-related siliciclastic phases predominantly carbonate-rich sequence, like late Miocene-Pliocene Bare Formation. also chronologically calibrate planktonic biostratigraphic datums showing that Indonesian Throughflow (ITF) had shoaled enough early Pliocene act as biogeographical barrier between Pacific Indian Ocean.