Processes controlling a volcaniclastic turbiditic system during the last climatic cycle: Example of the Cilaos deep-sea fan, offshore La Réunion Island
|Author(s)||Sisavath Emmanuelle1, 2, Mazuel Aude3, Jorry Stephan1, Babonneau Nathalie3, Bachelery Patrick4, de Voogd Beatrice5, 6, Salpin Marie7, Emmanuel Laurent7, Beaufort Luc8, Toucanne Samuel1|
|Affiliation(s)||1 : IFREMER, Lab Environm Sedimentaires, F-29280 Plouzane, France.
2 : Univ Reunion, Sorbonne Paris Cite, CNRS,UMR7154, Lab GeoSci Reunion,Inst Phys Globe Paris, St Denis 97715 9, La Reunion.
3 : Univ Brest, IUEM, Domaines Ocean UMR6538, F-29200 Plouzane, France.
4 : Univ Clermont Ferrand, CNRS, Observ Phys Globe Clermont Ferrand, Lab Magmas & Volcans,UMR 6524,IRD, F-63038 Clermont Ferrand, France.
5 : Univ Pau & Pays Adour, F-64000 Pau, France.
6 : CNRS, FR 2952, F-64000 Pau, France.
7 : Univ Paris 06, CNRS, Lab Biomineralisat & Environm Sedimentaires, ISTeP,UMR7193, F-75252 Paris 05, France.
8 : Aix Marseille Univ, CNRS, CEREGE, UMR6635, F-13545 Aix En Provence 4, France.
|Source||Sedimentary Geology (0037-0738) (Elsevier Science Bv), 2012-12 , Vol. 281 , P. 180-193|
|WOS© Times Cited||13|
|Keyword(s)||Turbidites, La Reunion Island, Indian Ocean, Late Quaternary, Volcaniclastic system|
|Abstract||The present study focused on turbidite sedimentation in the Cilaos turbidite system, a volcaniclastic deep-sea fan recently recognized offshore La Réunion Island. A set of piston cores was collected in order to establish the stratigraphy of this fan and to examine the processes controlling the turbidite sedimentation off the Cilaos cirque (Piton des Neiges volcanic massif) over the last climatic cycle. Two main phases of turbidite activity were identified, during the ca 140–127 ka and 30–0 ka periods, coinciding with the two last glacial–interglacial transitions (i.e., Terminations II and I). In addition to changes in climate and eustatic sea-level, these periods coincide with a low effusive volcanic activity of the Piton des Neiges volcano. The high erosional rates identified in the Cilaos cirque during these intervals of both low effusive volcanic activity and enhanced rainfall level are probably the main driver of sediment supply to the deep‐sea depositional system. These new findings also highlight the important capacity of volcaniclastic turbidite systems to record rapid paleoenvironmental changes.|