Seismic record of a cyclic turbidite-contourite system in the Northern Campos Basin, SE Brazil

Sedimentary model for mixed depositional systems along the Pacific margin of the Antarctic Peninsula: Decoding the interplay of deep-water processes

“…These systems share similar depositional and erosional features, with differences in spatial layout, dimensions, seismic stacking patterns and sedimentary facies. Examples from the Mesozoic include the Late Cretaceous record from the middle slope to the upper rise offshore Uruguay (Creaser et al, 2017) and Argentina (Rodrigues et al, 2021), while Cenozoic examples include the Late Miocene-Quaternary record along the upper slope of the South China Sea (Gong et al, 2013(Gong et al, , 2016, the Pliocene record offshore SE Greenland (Rasmussen et al, 2003), and the Paleogene to present deposits along the upper and middle slope of Brazil (Mutti et al, 2014;Pandolpho et al, 2021), Tanzania and Mozambique (Sansom, 2018;Fonnesu et al, 2020;Fuhrmann et al, 2020).…”

“…The mixed systems deposited along the upper and middle slopes of the Brazilian, Tanzanian and Mozambique margins (Mutti et al, 2014;Sansom, 2018;Chen et al, 2020;Fonnesu et al, 2020;Fuhrmann et al, 2020;Pandolpho et al, 2021) share similar morphologies with the PMAP systems, despite being located at shallower water depths along the continental margin than those of the PMAP. Their mixed systems feature laterally migrating asymmetric channel-drifts (or channellevees) and offset stacking sedimentary lobes.…”

“…Recent studies have identified distinct morphological elements at a low-to medium-resolution spatial scale (>100 m -1 km; Gong et al, 2013Gong et al, , 2020Fonnesu et al, 2020;Batchelor et al, 2021;Pandolpho et al, 2021). Most of these studies are based on multichannel seismic data, which span long temporal scales and do not provide sufficient spatial coverage and vertical resolution to understand the variability of mixed systems in detail.…”

Instability of deep-sea currents over tidal and seasonal timescales

“…It is increasingly recognised that these processes rarely operate in isolation, and that mixed turbidite-contourite systems, where down-and alongslope systems interact, may be the norm 13 . These interactions are most pronounced where along-slope contour currents orthogonally intersect down-slope oriented submarine canyons or channels, either directly de ecting sediment suspended by gravity ows, or 'passively' shaping the morphology of their deposits during periods when gravity ows are not operational [13][14][15][16][17][18][19][20][21][22][23] . These dynamic interactions can modify sediment transport regimes, controlling the distribution and fate of sediments, organic carbon, nutrients, and anthropogenic particles such as microplastics [24][25][26][27] .…”

Recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsula

“…There is a significant interest in the recognition and distinction of deep‐water facies due to their impact on the formation of hydrocarbon reservoirs (Viana, 2008; Mutti et al ., 2014; Sansom, 2018; Fonnesu et al ., 2020), as well as their usefulness as records of palaeoclimatic or palaeoceanographic changes (Rebesco et al ., 2014; Thiéblemont et al ., 2020), slope stability and geohazard studies (Laberg & Camerlenghi, 2008; Miramontes et al ., 2018; Teixeira et al ., 2019) and for the sustainability of deep‐sea ecosystems (Hebbeln et al ., 2016; Lozano et al ., 2020). At present, the study of mixed systems has focused strongly on the recognition of seismic and morphological elements at a broad (>10 m) to medium ( ca 1 m) scale (Michels et al ., 2002; Gong et al ., 2013; Mutti et al ., 2014; Creaser et al ., 2017; Cauxeiro et al ., 2020; Pandolpho et al ., 2021; Rodrigues et al ., 2021). However, several authors have underlined a clear dearth of studies at the sedimentary facies scale (Stanley, 1987, 1988, 1993; Shanmugam et al ., 1993; Viana et al ., 1998; Gong et al ., 2016).…”