Timescale dependent sedimentary record during the past 130 kyr from a tropical mixed siliciclastic–carbonate shelf edge and slope: Ashmore Trough (southern Gulf of Papua)

In tropical and sub-tropical mixed siliciclastic–carbonate depositional systems, fluvial input in situ neritic carbonate interact over space time. Despite being the subject of many studies, controls on partitioning sediments remains controversial. Mixed sedimentary records, from Ashmore Trough shelf edge slopes (southern Gulf Papua), are coupled with global sea-level curves anchored to Marine Isotope Stage stratigraphy constrain models sediment accumulation at two different timescales for past 130 kyr: (i) 100 kyr scale last glacial cycle; (ii) millennial deglaciation. During cycle, production were primarily controlled by fluctuations. Export was initiated during re-flooding previously exposed reefs continued 5e 1 interglacial highs. Siliciclastic fluxes slope interplay sea level, physiography oceanic currents. Heterogeneous siliciclastic mud slope, took place 5d 3 fall. Siliciclastics reached adjacent depocentres 2. Coralgal reef oolitic–skeletal sand resumed subsequent stepwise rise Contemporaneous, abrupt increased precipitation discharge illustrates that climate deglacial sedimentation. persisted until ca 8.5 ka. Carbonate waned after 14 ka, whereas it since 11.5 when bank tops re-flooded. When comparing cycle sedimentation patterns southern Papua other coeval level emerge as primary deposition scale. At scale, also change unstable atmospheric conditions