Appproche structurale in situ des milieux fondus sous conditions extrêmes de température et de pression

Abstract : Real time thermal remote sensing of active volcanic systems is a crucial technique for understanding the behavior and eruptive activity of hot magmatic bodies. Such technology relies on determining the thermal emissivity of the magma, a parameter to identify the temperature of magma. We used a direct method to obtain a spectrum in the wavenumber range from 400 to 13000 cm-1; the natural (volcano Erebus and Teide) and synthetic samples were heated up from room temperature to 2000K with a CO2 laser and data were collected during all the heating stage with a FTIR spectrometer.Our results thus indicate that thermal emissivity of magmatic rock is affected by changes in composition and thermal history. The emissivity measurements show the important role of the iron and the cooling rate on the spectral response of the phonolite composition. These are important observations since different emissivity will lead to different temperature determinations and hence, an erroneous interpretation on the rheology and thermal efficiency of the magmatic body.
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Hao Li. Appproche structurale in situ des milieux fondus sous conditions extrêmes de température et de pression. Autre. Université d'Orléans, 2018. Français. ⟨NNT : 2018ORLE2054⟩. ⟨tel-02389874⟩

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