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Post-obduction evolution of New Caledonia

Sevin, B, Maurizot, P, Cluzel, D, Tournadour, E, Etienne, S, Folcher, N, Jeanpert, J, Collot, J, Iseppi, M, Meffre, S ORCID: 0000-0003-2741-6076 and Patriat, M 2020 , 'Post-obduction evolution of New Caledonia', in P Maurizot and N Mortimer (eds.), New Caledonia: Geology, Geodynamic Evolution and Mineral Resources , Geological Society, United Kingdom, pp. 147-188.

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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 Type: Book Section
Authors/Creators: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
Keywords: obduction, ophiolite, SW Pacific
Publisher: Geological Society
DOI / ID Number: 10.1144/M51-2018-74
Copyright Information:

Copyright 2020 The Authors

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