Impact of river channelshifts on tetraether lipidsin the Rhône prodelta (NW Mediterranean): Implication for the BIT index as an indicator of palaeoflood events

Jung-Hyun Kim 1 Roselyne Buscail 2 Anne-Sophie Fanget 2 Frédérique Eyrolle-Boyer 3 Maria-Angela Bassetti 2 Denise Dorhout 1 Marianne Baas 1 Serge Berné 4, 2 Jaap S. Sinninghe Damste 1
1 NIOZ - Royal Netherlands Institute for Sea Research
2 CEFREM - Centre de Formation et de Recherche sur les Environnements Méditérranéens
3 Laboratoire d'Etudes Radioécologiques des milieux Continental et marin
4 GM - Unité de recherche Géosciences Marines (Ifremer)
Abstract : We tested the applicability of the BIT (branched and isoprenoid tetraether) index as a proxy for palaeoflood events in the river-dominated continental margin of the Gulf of Lions (NW Mediterranean). We compared the concentrations of branched glycerol dialkyl glycerol tetraethers (br GDGTs) and crenarchaeol in suspended particulate matter (SPM) collected downstream in the Rhône River, as well as in surface sediments and a ca. 8m piston core from the Rhône prodelta. The core covered the last 400 yr, with four distinct intervals recording the river influence under natural and man-induced shifts in four main channels of the river mouth (Bras de Fer, Grand Rhône, Pégoulier,and Roustan). The results indicate that there are mixed sources of br GDGTs and crenarchaeol in the prodelta, complicating applicationof the BIT index as an indicator of continental organic carbon input and thus as a palaeoflood proxy. However, the sedimentary BIT record for the period when continental material was delivered by the river more directly to the core site (Roustan phase;1892 to present) mimics the historical palaeoflood record. This shows the potential of the BIT index as a palaeoflood proxy, provided that the delivery route of the continental material by rivers to the core sites remains constant over time. The study also highlights the idea that shifts in river channels should be taken into account for the use of the BIT index as a palaeoflood proxy.
Keywords : BIT index GDGTs Rhône prodelta Palaeoflood
Type de document :
Article dans une revue
Organic Geochemistry, Elsevier, 2014, 75, pp.99-108. 〈10.1016/j.orggeochem.2014.06.011〉
Liste complète des métadonnées

Littérature citée [55 références]  Voir  Masquer  Télécharger
https://hal-univ-perp.archives-ouvertes.fr/hal-01274844
Contributeur : Olivier Savoyat <>
Soumis le : jeudi 18 février 2016 - 11:31:24
Dernière modification le : jeudi 11 janvier 2018 - 06:25:50
Document(s) archivé(s) le : jeudi 19 mai 2016 - 10:32:56

Fichier

29345.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

UNIV-PERP | AGROPOLIS | IRSN

Citation

Jung-Hyun Kim, Roselyne Buscail, Anne-Sophie Fanget, Frédérique Eyrolle-Boyer, Maria-Angela Bassetti, et al.. Impact of river channelshifts on tetraether lipidsin the Rhône prodelta (NW Mediterranean): Implication for the BIT index as an indicator of palaeoflood events. Organic Geochemistry, Elsevier, 2014, 75, pp.99-108. 〈10.1016/j.orggeochem.2014.06.011〉. 〈hal-01274844〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

122

Téléchargements de fichiers

102

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD