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Post-obduction evolution of New Caledonia

Citation

Sevin, B and Maurizot, P and Cluzel, D and Tournadour, E and Etienne, S and Folcher, N and Jeanpert, J and Collot, J and Iseppi, M and Meffre, S and Patriat, M, Post-obduction evolution of New Caledonia, New Caledonia: Geology, Geodynamic Evolution and Mineral Resources, Geological Society, P Maurizot and N Mortimer (ed), United Kingdom, pp. 147-188. ISBN 978-1-78620-466-0 (2020) [Research Book Chapter]

Copyright Statement

Copyright 2020 The Authors

DOI: doi:10.1144/M51-2018-74

Abstract

The post-obduction formations of Grande Terre, New Caledonia, comprise igneous intrusions, regolith cover, and marine and terrestrial sedimentary rocks. Two restricted Late Oligocene granitoid bodies are intruded into the Peridotite Nappe and its substrate in the south of the island. Thick regolith cover developed over the Peridotite Nappe from the Late Oligocene or earlier. The Népoui Group comprises Late Oligocene–Early Miocene mixed marine carbonate and siliciclastic deposits. It mainly reworks the Peridotite Nappe and its regolith cover. Its development pattern is mainly controlled by tectonic uplift and subsidence. The Gwa N'Doro Formation on the eastern coast and the Fluvio-lacustrine Formation in the south are remnants of the Miocene–Present river network. Offshore, thick Oligocene to Neogene sedimentary successions are imaged by seismic surveys on the margins of Grande Terre, although these successions have not been drilled and remain undated. Several dredges have recovered shallow Miocene sedimentary rocks, indicating substantial Neogene subsidence. Quaternary formations are represented inland by aeolianite, vertisols and calcrete and offshore by the large barrier reef–lagoon complex, the onset of which is dated at c. 400 ka. This chapter discusses the different models proposed for the post-obduction evolution of Grand Terre.

Item Details

Item Type:Research Book Chapter
Keywords:obduction, ophiolite, SW Pacific
Research Division:Earth Sciences
Research Group:Geology
Research Field:Structural geology and tectonics
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Meffre, S (Dr Sebastien Meffre)
ID Code:139895
Year Published:2020
Funding Support:Australian Research Council (CE0561595)
Deposited By:CODES ARC
Deposited On:2020-07-13
Last Modified:2020-08-07
Downloads:0

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