Pre-obduction records of Eocene foreland basins in central New Caledonia: an appraisal from surface geology and Cadart-1 borehole data

Abstract : The Bourail Anticline in central New Caledonia has been a target for petroleum exploration since the 1950s. It is a broad structure in which a 4-km-thick pile of Eocene turbidite (Eocene Bourail Flysch) is exposed. The Cadart-1 exploration borehole (1930 m deep) was drilled on the anticlinal axis in 1999, intersecting the Paleogene and underlying Late Cretaceous sedimentary rocks. A sedimentological, stratigraphic and provenance analysis is presented. Volcanic debris appears progressively in the upper part of the flysch, becoming predominant upwards along with the intercalation of upward-thickening and -coarsening debris flow breccia. Clinopyroxene and basalt clasts in the upper part of the flysch were derived from enriched tholeiite (E-MORB) of the Poya Terrane. The Eocene paleogeography can be interpreted as a foreland basin system with a depocentre close to the area of Bourail Anticline, an accretionary complex to the northwest and a forebulge to the southeast. This system migrated southeastward through New Caledonia from the Paleocene to the Late Eocene.
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New Zealand Journal of Geology & Geophysics,, 2014, 57 (3), pp.300-311. 〈10.1080/00288306.2014.885065〉
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https://hal-brgm.archives-ouvertes.fr/hal-01176404
Contributeur : Anne-Marie Pouget <>
Soumis le : mercredi 15 juillet 2015 - 13:21:14
Dernière modification le : mardi 15 mai 2018 - 11:34:02

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Pierre Maurizot, Dominique Cluzel. Pre-obduction records of Eocene foreland basins in central New Caledonia: an appraisal from surface geology and Cadart-1 borehole data. New Zealand Journal of Geology & Geophysics,, 2014, 57 (3), pp.300-311. 〈10.1080/00288306.2014.885065〉. 〈hal-01176404〉

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