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New Caledonia: Geology, Geodynamic Evolution and Mineral Resources

By P. Maurizot & N. Mortimer

31 May 2021

New Caledonia is a small group of tropical islands in the south-western Pacific Ocean and is still a department of France. The archipelago is composed of several islands (the Loyalty Islands, Belep Islands, Ile des Pins, Grande Terre), reefs and lagoons. New Caledonia lies approximately 1,500 km east of Australia, 2,000 km north of New Zealand and just south of Vanuatu. The islands have had a long geological history that begins with Gondwana’s break up during the Mesozoic. The islands’ geology can be segregated into four major rock groups that were subject to accretion, subduction and obduction.

Such an active geological environment and complex history provides the basis for the development of the archipelago’s economic geology. The most important component of the mining industry in New Caledonia is nickel production from tropical laterites. These deposits are widespread, cover much of the ultramafic terranes and have been exploited for decades. Major projects include Goro and Koniambo, two of the largest nickel operations in the world. Other commercial operations produce cobalt and chromium, again as by-products of the ultramafic terranes.

This memoir provides a comprehensive summary of the current knowledge of New Caledonia’s geology, geodynamic evolution and mineral resources, based on a compilation of published and unpublished information. It comprises 10 research papers, each addressing a geological assemblage or topic. After an introductory chapter and a review of the published geodynamic models of evolution of the SW Pacific, chapters 3 to 5 focus on the main geological assemblages of Grande Terre: the Pre-Late Cretaceous basement terranes, the Late Cretaceous to Eocene cover, and the Eocene subduction-obduction complex – one of the largest and best-preserved in the world. Chapter 6 is devoted to the Loyalty Islands and Ridge. Chapter 7 deals with the mostly terrestrial post-obduction units including regolith. Chapter 8 deals with palaeobiogeography and discusses plausible scenarios of biotic evolution. Chapters 9 and 10 provide a comprehensive review of New Caledonia’s mineral resources.

The editors and authors are to be congratulated on such a large undertaking, particularly the senior editor who has co-authored all the chapters. The volume will interest stratigraphers, sedimentologists, marine geologists, palaeontologists, palaeogeographers, igneous and metamorphic petrologists, geochemists, geochronologists, and specialists in tectonics, geodynamic evolution, regolith development and economic geology.

Reviewed by Rob Bowell

New Caledonia: Geology, Geodynamic Evolution and Mineral Resources by P. Maurizot & N. Mortimer (Eds, 2020) Geological Society Memoir No.51, 285 pp. (hbk) ISBN-13: 9781786204660 PRICE: £ 120 FELLOW’S PRICE: £ 60