Chapter 4: Physical Volcanology of Komatiites and Ni-Cu-(PGE) Deposits of the Southern Abitibi Greenstone Belt
Published:January 01, 2017
Michel G. Houlé, C. Michael Lesher, S. Préfontaine, 2017. "Physical Volcanology of Komatiites and Ni-Cu-(PGE) Deposits of the Southern Abitibi Greenstone Belt", Archean Base and Precious Metal Deposits, Southern Abitibi Greenstone Belt, Canada, Thomas Monecke, Patrick Mercier-Langevin, Benoît Dubé
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Komatiitic rocks occur mainly in Archean greenstone belts, less commonly in Paleoproterozoic volcano-sedimentary belts, and only rarely in younger volcanic settings. As in most other greenstone belts worldwide, komatiitic rocks are locally abundant in the Abitibi greenstone belt but generally represent only a small proportion of the volcanic rocks in the volcanic succession. Although only locally exposed, glacially sculpted exposures of only weakly metamorphosed and mildly deformed komatiites of mineralized and unmineralized komatiites in the Abitibi greenstone belt are among the best in the world, characterized by excellent textural preservation and, in some cases, excellent mineralogical preservation.