Chapter 7 Post-obduction evolution of New Caledonia

New Caledonia's post-obduction evolution, spanning from the Late Oligocene to the present, reveals significant tectonic and sedimentary dynamics. The study highlights two key granitoid intrusions into the Peridotite Nappe, alongside extensive regolith development controlled by tectonic uplift and subsidence. The Népoui Group, a mix of marine carbonate and siliciclastic deposits, reflects this dynamic history, while remnants like the Gwa N'Doro Formation and Fluvio-lacustrine Formation showcase Miocene to present-day river systems. Offshore seismic surveys indicate substantial Neogene subsidence, though undated sedimentary successions remain. Quaternary formations, including aeolianite and calcrete inland, and a barrier reef–lagoon complex offshore (dated to ~400 ka), further illustrate New Caledonia's complex geological narrative. The chapter synthesizes models for this evolution, integrating field observations, seismic data, and sediment analysis.

Sevin, B., Maurizot, P., Cluzel, D., Tournadour, E., Etienne, S., Folcher, N., Jeanpert, J., Collot, J., Iseppi, M., Meffre, S., & Patriat, M. (2020). Chapter 7 Post-obduction evolution of New Caledonia. Geological Society, London, Memoirs, 51(1), 147–188. https://doi.org/10.1144/m51-2018-74