Tectonic history of northern New Caledonia Basin from deep offshore seismic reflection: Relation to late Eocene obduction in New Caledonia, southwest Pacific
|Author(s)||Collot Julien1, Geli Louis1, Lafoy Y3, Vially R4, Cluzel D2, Klingelhoefer Frauke1, Nouze Herve1|
|Affiliation(s)||1 : IFREMER, Ctr Brest, Dept Geodynam & Geophys, F-29280 Plouzane, France.
2 : Univ Orleans, CNRS, Inst Sci Terre Orleans, UMR 6113, F-45067 Orleans 2, France.
3 : Direct Ind Mines & Energie Nouvelle Caledonie, Serv Geol Nouvelle Caledonie, F-98845 Noumea, New Caledonia.
4 : Inst Francais Petr, F-92853 Rueil Malmaison, France.
|Source||Tectonics (0278-7407) (AGU), 2008-12 , Vol. 27 , N. TC6006 , P. 1-20|
|WOS© Times Cited||31|
|Keyword(s)||New Caledonia, seismics, obduction|
|Abstract||New, high-quality multichannel seismic reflection data from the western New Caledonia offshore domain allow for the first time the direct, continuous connection of seismic reflectors between the Deep Sea Drilling Project 208 drill hole on the Lord Howe Rise and the New Caledonia Basin. A novel seismic interpretation is hence proposed for the northern New Caledonia Basin stratigraphy, which places the Eocene/Oligocene unconformity deeper than previously thought and revisits the actual thickness of the pre-Oligocene sequences. A causal link is proposed between the obduction of the South Loyalty Basin over New Caledonia (NC) and the tectonic history of the northern New Caledonia Basin. Here it is suggested that as the South Loyalty Basin was being obducted during early Oligocene times, the NC Basin subsided under the effect of the overloading and underthrusted to accommodate the compressional deformation, which resulted in (1) the uplift of the northern Fairway Ridge and (2) the sinking of the western flank of New Caledonia. This event also had repercussions farther west with the incipient subsidence of the Lord Howe Rise.|