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Late Holocene paleoenvironment in northern New Caledonia, southwestern Pacific, from a multiproxy analysis of lake sediments

Published online by Cambridge University Press:  20 January 2017

Denis Wirrmann ,
Anne-Marie Sémah  and
Magali Chacornac-Rault
Denis Wirrmann*
Affiliation:
Institut de recherche pour le développement (IRD), PALÉOTROPIQUE, BP A5, 98848 Nouméa cedex, Nouvelle-Calédonie, France
Anne-Marie Sémah
Affiliation:
Institut de recherche pour le développement (IRD), PALÉOTROPIQUE, 32 Avenue Henri Varagnat, 93143 Bondy cedex, France
Magali Chacornac-Rault
Affiliation:
Institut de recherche pour le développement (IRD), PALÉOTROPIQUE, 32 Avenue Henri Varagnat, 93143 Bondy cedex, France Dpt. de Préhistoire, Muséum National d’Histoire Naturelle, (MNHN) UMR 5198, USM 204, 1 rue René Panhard, 75013 Paris, France
*
⁎Corresponding author. Fax: +33 687 26 43 26. E-mail address:denis.wirrmann@noumea.ird.nc (D. Wirrmann).
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Abstract

Lithostratigraphic and palynological analysis of two cores recovered from the ‘Grand Lac’ (New Caledonia), combined with 35 14C AMS dates, yields a paleoenvironmental record spanning the last 2000 yr. The lithology is represented mainly by clayey or laminated layers. A catastrophic event, which is marked by very coarse deposits, occurred probably between ca 1070–960 cal yr B.P. and possibly is associated with an unusually severe La Niña event. Before and after this event, a similar combination of the two main sediment types is recorded. The repeated alternation of laminated and clayey layers is interpreted as the response to local hydrologic forcing, which may reflect a shift from relatively wet to relatively drier conditions, respectively. Variable amount of micro-charcoal is detected all along the profile. Without additional evidence, notwithstanding the initial local human settlement documented since ca 2900 14C yr B.P., micro-charcoal occurrence and variability cannot be linked directly to an anthropogenic origin. No distinct palynological zonations in relation to the lithology are observed, and the vegetation changes may only represent minor transitions across environmental limits.

Keywords

Lacustrine sedimentologyPalynologyLate HoloceneNew CaledoniaSouth Pacific
Type
Research Article
Information
Quaternary Research , Volume 66 , Issue 2 , September 2006 , pp. 213 - 232
Copyright
University of Washington

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