Subject
regolith, terrestrial sediments, Fluvio-lacustrine Formation, uplift, eustatism, New Caledonia, obduction., [SDU]Sciences of the Universe [physics], [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment

Domains
Géologie, Sciences de la Terre, Environnement

Description

International audience The poorly studied iron-rich terrestrial sediments, referred to as the Fluvio-lacustrine Formation, that cropout in the southern part of the Grande Terre of New Caledonia document the last 25 Ma of thegeological history of the island. The age of this formation, which is mainly derived from the erosion of anultramafic regolith, is not tightly constrained yet; however, it has recorded several episodes of postobductionerosion and sedimentary infill preceded and followed by weathering and reactivatederosion. A correlation with early Miocene slab break-off, which may have triggered a first stage oferosion marked by coarse conglomerate, is suggested. Thereafter, sediments filled topographic lowsand were in turn weathered during an interval of tectonic quiescence. Finally, Holocene sea-level dropand southward tilt of southern New Caledonia, owing to the involvement of eastern Australian Plate inthe New Hebrides (Vanuatu) subduction zone, locally changed the drainage pattern and deeplyeroded the sediments.

Keywords
Environnement, Environment, History

Language
English (en-GB)

Creators
Folcher, N., Sevin, B., Quesnel, Florence, Lignier, V., Allenbach, M., Maurizot, P., Cluzel, Dominique

Contributors
Pôle Pluridisciplinaire de la Matière et de l'Environnement (PPME) ; Université de la Nouvelle-Calédonie (UNC), Geological Survey of New Caledonia ; Department of Industry Mines and Energy, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) ; Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)

Sources
ISSN: 0812-0099, EISSN: 1440-0952, Australian Journal of Earth Sciences, https://hal-insu.archives-ouvertes.fr/insu-01341887, Australian Journal of Earth Sciences, Taylor & Francis, 2015, 62 (4), pp.479-492. ⟨10.1080/08120099.2015.1049207⟩

Relation
info:eu-repo/semantics/altIdentifier/doi/10.1080/08120099.2015.1049207

Coverage
Vanuatu, New Hebrides

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