Impact of river channel shifts on tetraether lipids in the Rhône prodelta (NW Mediterranean): Implication for the BIT index as an indicator of palaeoflood events
| Autor: | Roselyne Buscail, Maria-Angela Bassetti, Denise J C Dorhout, Anne-Sophie Fanget, Marianne Baas, Frédérique Eyrolle-Boyer, Serge Berné, Jaap S. Sinninghe Damsté, Jung-Hyun Kim |
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| Přispěvatelé: | Royal Netherlands Institute for Sea Research (NIOZ), Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM), Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etudes Radioécologiques des milieux Continental et marin, Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Unité de recherche Géosciences Marines (Ifremer) (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), non-UU output of UU-AW members |
| Rok vydání: | 2014 |
| Předmět: |
Mediterranean climate
Total organic carbon geography geography.geographical_feature_category Palaeoflood Rhone prodelta Oceanography Continental margin 13. Climate action Geochemistry and Petrology GDGTs River mouth BIT index Sedimentary rock RhÔne prodelta [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Geology |
| Zdroj: | Organic Geochemistry Organic Geochemistry, Elsevier, 2014, 75, pp.99-108. ⟨10.1016/j.orggeochem.2014.06.011⟩ Organic Geochemistry, 75, 99. Elsevier Limited Organic Geochemistry (0146-6380) (Pergamon-elsevier Science Ltd), 2014-10, Vol. 75, P. 99-108 |
| ISSN: | 0146-6380 |
| DOI: | 10.1016/j.orggeochem.2014.06.011 |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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