Sedimentology and distribution of late quaternary calciturbidites and calcidebrites in the Mozambique Channel (Southwest Indian Ocean)

Type Article
Date 2021-04
Language English
Author(s) Counts John W.ORCID1, 2, 3, Jorry StephanORCID1, Vazquez-Riveiros NataliaORCID1, Amy Lawrence A.ORCID2, 3, Dennielou Ewen4, Jouet GwenaelORCID1
Affiliation(s) 1 : Unité Géosciences Marines, Institut Français de Recherche pour l’Exploitation de la Mer (IFREMER), Pointe du Diable, 29280, Plouzané, France
2 : School of Earth Sciences, University College Dublin, Belfield, Dublin 4, Ireland
3 : Irish Centre for Research in Applied Geosciences (iCRAG), O’Brien Centre for Science, University College Dublin, Belfield, Dublin 4, Ireland
4 : UniLaSalle, 19 Rue Pierre Waguet, BP30313, 60026, Beauvais, France
Source Facies (0172-9179) (Springer Science and Business Media LLC), 2021-04 , Vol. 67 , N. 2 , P. 17 (23p.)
DOI 10.1007/s10347-021-00624-1
WOS© Times Cited 2
Keyword(s) Calciturbidite, Carbonate, Deepwater, Indian Ocean, Mozambique channel, Calcidebrite, Grainstone

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.

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Counts John W., Jorry Stephan, Vazquez-Riveiros Natalia, Amy Lawrence A., Dennielou Ewen, Jouet Gwenael (2021). Sedimentology and distribution of late quaternary calciturbidites and calcidebrites in the Mozambique Channel (Southwest Indian Ocean). Facies, 67(2), 17 (23p.). Publisher's official version : , Open Access version :