FN Archimer Export Format PT J TI Sedimentology and distribution of late quaternary calciturbidites and calcidebrites in the Mozambique Channel (Southwest Indian Ocean) BT AF Counts, John W. Jorry, Stephan Vazquez-Riveiros, Natalia Amy, Lawrence A. Dennielou, Ewen Jouet, Gwenael AS 1:1,2,3;2:1;3:1;4:2,3;5:4;6:1; FF 1:;2:PDG-REM-GM-LGS;3:PDG-REM-GM-LGS;4:;5:;6:PDG-REM-GM-LGS; C1 Unité Géosciences Marines, Institut Français de Recherche pour l’Exploitation de la Mer (IFREMER), Pointe du Diable, 29280, Plouzané, France School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland Irish Centre for Research in Applied Geosciences (iCRAG), O’Brien Centre for Science, University College Dublin, Belfield, Dublin 4, Ireland UniLaSalle, 19 Rue Pierre Waguet, BP30313, 60026, Beauvais, France C2 IFREMER, FRANCE UNIV COLL DUBLIN, IRELAND ICRAG, IRELAND UNILASALLE, FRANCE SI BREST SE PDG-REM-GM-LGS IN WOS Ifremer UPR copubli-france copubli-europe IF 2.211 TC 4 UR https://archimer.ifremer.fr/doc/00684/79580/86886.pdf LA English DT Article CR PAMELA-MOZ01 PAMELA-MOZ04 BO L'Atalante Pourquoi pas ? DE ;Calciturbidite;Carbonate;Deepwater;Indian Ocean;Mozambique channel;Calcidebrite;Grainstone AB Submarine gravity flow processes on carbonate platform slopes can lead to the deposition of calciturbidite and calcidebrite beds on the adjacent deep-water seafloor. Such deposits have been previously found to occur more frequently during sea-level highstands, leading to increased export of carbonates to the deep sea during interglacial periods. Here, we document a new occurrence of these types of event beds in cores near a series of volcano-cored carbonate platforms in the Mozambique Channel (SW Indian Ocean), describing them from a sedimentological perspective and analyzing the controls on their distribution. 32 event beds, located near four isolated platforms, are composed primarily of uncoated skeletal grains from primarily shallow-water and planktic taxa. Compositional analysis shows that planktic foraminifera are hydrodynamically sorted such that they form a greater proportion of the upper parts of event beds. Age models based on foraminifer δ18O isotope data allow for precise (ky-scale) dating of each gravity flow event; results show that events occurred with frequencies ranging from 2 to 4 events per 100,000 years over the past ~ 800 kyr regardless of the phase within the sea-level cycle (i.e., transgressive, regressive, highstand or lowstand). However, events were most frequent during periods, both relative and absolute, of highest sea level, and are therefore interpreted to be controlled in part by sea-level status or change, though additional causes are also possible. PY 2021 PD APR SO Facies SN 0172-9179 PU Springer Science and Business Media LLC VL 67 IS 2 UT 000626844300001 DI 10.1007/s10347-021-00624-1 ID 79580 ER EF