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

Interplay of deep-water sedimentary processes is responsible for building a myriad of features anddeposits across mixed turbidite–contourite systems, from <5 cm beds to >200 km long sedimentary drifts.Investigations of the spatial and temporal variability of their sedimentary facies and facies associations iscrucial to reveal the dynamics between along-slope bottom currents and down-slope turbidity currents, aswell as their impact on drift construction and channel erosion. This study focuses on extensive modernmixed (turbidite–contourite) systems, developed across the continental rise of the Pacific margin of the Antarctic Peninsula. Nine sediment cores were sampled and analysed, through grain size and geochemicalmethods, to study the sedimentary facies at high-resolution (ca. 1 to 20 cm). Three main facies associationshave been identified across distinct morphological features (i.e. mounded drifts and trunk channels),comprising intercalations of hemipelagites, bottom current reworked sands (which include fine to coarsegrainedcontourites) and gravitational facies (turbidites and mass-transport deposits). These faciesassociations reflect fluctuations of the background sedimentation, oscillations of the bottom-currentvelocity and of the frequency of gravity-driven currents. The sedimentary record features cyclic alternationsduring the Late Quaternary (>99 kyr), suggesting that variations between along-slope bottom currents anddown-slope turbidity currents are strongly linked to glacial–interglacial cycles during Marine IsotopeStages 1 to 6. Sedimentary records affected by bottom currents on polar margins, such as those of theAntarctic Peninsula, are essential to decipher the facies and facies sequences of bottom-current deposits, asthe low degree of bioturbation throughout most of the sediments allows us to observe the originalsedimentary structures, which are poorly preserved in similar deposits from other continental margins.