Collot J., Patriat M., Sutherland R., Williams S., Cluzel D., Seton M., Pelletier Bernard, Roest W.R., Etienne S., Bordenave A., Maurizot P. (2020). Geodynamics of the SW Pacific : a brief review and relations with New Caledonian geology. In :
Maurizot P. (ed.), Mortimer N. (ed.). New Caledonia : geology, geodynamic evolution and mineral resources. Londres : Geological Society, 13-26. (Geological Society Memoir ; 51). ISBN 978-1-78620-466-0.
Titre du document
Geodynamics of the SW Pacific : a brief review and relations with New Caledonian geology
Année de publication
2020
Auteurs
Collot J., Patriat M., Sutherland R., Williams S., Cluzel D., Seton M., Pelletier Bernard, Roest W.R., Etienne S., Bordenave A., Maurizot P.
In
Maurizot P. (ed.), Mortimer N. (ed.), New Caledonia : geology, geodynamic evolution and mineral resources
Source
Londres : Geological Society, 2020,
13-26 (Geological Society Memoir ; 51). ISBN 978-1-78620-466-0
The SW Pacific region consists of a succession of ridges and basins that were created by the fragmentation of Gondwana and the evolution of subduction zones since Mesozoic times. This complex geodynamic evolution shaped the geology of New Caledonia, which lies in the northern part of the Zealandia continent. Alternative tectonic models have been postulated. Most models agree that New Caledonia was situated on an active plate margin of eastern Gondwana during the Mesozoic. Extension affected the region from the Late Cretaceous to the Paleocene and models for this period vary in the location and nature of the plate boundary between the Pacific and Australian plates. Eocene regional tectonic contraction included the obduction of a mantle-derived Peridotite Nappe in New Caledonia. In one class of model, this contractional phase was controlled by an east-dipping subduction zone into which the Norfolk Ridge jammed, whereas and in a second class of model this phase corresponds to the initiation of the west-dipping Tonga-Kermadec subduction zone. Neogene tectonics of the region near New Caledonia was dominated by the eastwards retreat of Tonga-Kermadec subduction, leading to the opening of a back-arc basin east of New Caledonia, and the initiation and southwestwards advance of the New Hebrides-Vanuatu subduction zone towards New Caledonia.
Plan de classement
Géologie régionale [064GEOREG]
Localisation
Fonds IRD [F B010084169]
Identifiant IRD
fdi:010084169
