First insights into mid-Holocene environmental change in central Vanuatu inferred from a terrestrial record from Emaotfer Swamp, Efaté Island
Wirrmann Denis, Eagar Stephen H., Harper Margaret A., Leroy Éric, Sémah Anne-Marie. 2011-12. .
ARTICLE, (2011-12 ) - PUBLISHEDVERSION - English (en-GB)
OPENACCESS -
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Audience : OTHER
HAL CCSD, Elsevier
Sujet
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
Domaines
Géologie, Sciences de la Terre, Climatologie, Sciences de l'environnement, Sciences exactes
Description
International audience Here we present the first terrestrial record of mid-Holocene environmental changes in Vanuatu. This preliminary multi-proxy analysis of core Tfer 06 from Emaotfer Swamp (Efaté Island) indicates changes in environmental conditions are mainly related to variations in climate over the last 6500 cal yr BP. Drier periods are broadly correlated with an increase in sustained El Niño events recorded in the Pacific on a decadal timescale. The earliest change is the disappearance of mangroves adjacent to the site around 3200 cal yr BP, this could well be due to both local tectonic uplift with subsequent hydrostatic adjustment and the onset of a drier period. From c. 3250-2500 cal yr BP the prevailing drier conditions can be linked to more persistent El Niño conditions. Local volcanic events had limited ecological impact on the area. Freshwater diatoms indicate a hydroseral succession, species living on submerged plants being common in muds from c. 3250-1500 cal yr BP, but rare in fibrous peat deposited later. Palaeoecological indicators of human impact have not been identified throughout this work.
Mots-clés
Environment, Océanographie
Auteurs
Wirrmann, Denis, Eagar, Stephen H., Harper, Margaret A., Leroy, Éric, Sémah, Anne-Marie
Contributeurs
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) ; Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) ; École normale supérieure - Paris (ENS-PSL) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
Sources
ISSN: 0277-3791, Quaternary Science Reviews, https://hal.archives-ouvertes.fr/hal-00755895, Quaternary Science Reviews, Elsevier, 2011, 30, pp.3908-3924. ⟨10.1016/J.QUASCIREV.2011.10.003⟩
Relation
info:eu-repo/semantics/altIdentifier/doi/10.1016/J.QUASCIREV.2011.10.003
