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Métallogénie du tantale: application aux différents styles de minéralisations en tantale dans la pegmatite de Tanco, Manitoba, Canada

Abstract : Tantalum is a high-tech metal that is mainly mined from rare-element pegmatites. Although tantalum mineralogy has been well characterized, very little is known about the processes that control the formation of Ta deposits. The goal of my thesis is to constrain Ta mineralization processes in the giant Tanco pegmatite (Canada), the third most important Ta deposit in the world. The Tanco pegmatite is extremely complex in terms of petrogenesis and mineralogy, and tantalum mineralization shows a complexity that reflects the highly fractionated features of the igneous body. I investigated two different aspects of Ta mineralization in the Tanco pegmatite: 1) its association with metagabbro rafts embedded in the pegmatite; 2) its association with late mica alteration of the central zones of the pegmatite. The fundamental questions behind those studies are : is Ta mineralization influenced by external factors ? What is the role of aqueous fluids (originating either externally or internally from the pegmatite) on Ta mineralization ? Through the study of these two complementary styles of mineralization, I was able to evaluate the contribution of magmatic versus metasomatic processes in the Ta mineralization, and to advance a metallogenetic model for Ta mineralization at Tanco, whereby Ta enrichment is considered as entirely magmatic in origin.
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https://tel.archives-ouvertes.fr/tel-00115210
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Submitted on : Monday, November 20, 2006 - 4:05:33 PM
Last modification on : Thursday, October 15, 2020 - 4:07:13 AM
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Marieke van Lichtervelde. Métallogénie du tantale: application aux différents styles de minéralisations en tantale dans la pegmatite de Tanco, Manitoba, Canada. Minéralogie. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00115210⟩

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