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Cristallochimie du pyroxène dans les komatiites et basaltes lunaires

Abstract : Zoned pyroxene crystals with pigeonite cores and augite mantles crystallize in komatiites and lunar basalts. To understand the origin and conditions of crystallization of these unusual pyroxenes, we chosed both experimental and analytical sudies. Our experiments in the CMAS system were able to reproduce the zoned acicular pigeonite-augite crystals characteristic of komatiites and lunar basalts. We studied a series of samples of komatiites from the Archean (2.7 Ga) Abitibi greenstone belt in Canada and lunar basalts. Our results show that the textures and chemical compositions in the pyroxenes in the komatiites are the result of crystallization under conditions that varied within a single flow, and from one flow to another. The results of this study, coupled with analytical modeling, and comparison with the geochemistry of other komatiites, led to the conclusion that water is not necessary for the genesis of a komatiite.
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https://tel.archives-ouvertes.fr/tel-00335493
Contributor : Sébastien Bouquain <>
Submitted on : Wednesday, October 29, 2008 - 4:30:58 PM
Last modification on : Thursday, November 19, 2020 - 3:54:26 PM
Long-term archiving on: : Monday, June 7, 2010 - 8:46:01 PM

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  • HAL Id : tel-00335493, version 1

Citation

Sébastien Bouquain. Cristallochimie du pyroxène dans les komatiites et basaltes lunaires. Géologie appliquée. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨tel-00335493⟩

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