The meteorite Northwest Africa 6693 (NWA 6693) was found in Morocco in March 2011 and classified as ungrouped achondrite. This sample exhibits a distinctive mineralogy and oxygen isotopic composition that is not aligned with any other class of achondrites. This thesis focuses on examining intriguing micrometric inclusions within plagioclase crystals using a polarizing optical microscope, Raman micro-spectroscopy, and X-ray fluorescence using synchrotron radiation. The experimental work was performed at the Department of Geoscience, Goethe University Frankfurt, Germany, at the Department of Geosciences, University of Padova, Italy and at the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. The obtained results report the presence of interesting inclusions of apatite, Ca5(PO4)3[F,OH,Cl], and merrillite, Ca9NaMg(PO4)7, in numerous feldspar crystals of this meteorite. In addition, some graphite inclusions were also found. This observed dualism between graphite and phosphate crystals present in the same inclusion is an interesting mineralogical association in meteorites because they could provide important information about the differentiation and magmatic processes of the parent body. This thesis aims to study and propose a consistent interpretation of the presence of these phosphate and graphite inclusions within this meteorite, considering possible implications related to the evolution of the parent body of this meteorite.
Il meteorite Northwest Africa 6693 (NWA 6693) è stato trovato in Marocco nel marzo 2011 e classificato come acondrite non raggruppata. Questo campione presenta una mineralogia distintiva e una composizione isotopica dell'ossigeno che non è allineata con nessun'altra classe di acondriti. Questa tesi si è concentrata sull'esaminare intriganti inclusioni micrometriche presenti all'interno di cristalli di plagioclasio utilizzando il microscopio ottico polarizzatore, la spettroscopia Micro-Raman e la fluorescenza a raggi X in luce di sincrotrone. Il lavoro sperimentale è stato svolto presso il Dipartimento di Geoscienze della Goethe University di Francoforte, in Germania, presso il Dipartimento di Geoscienze dell'Università di Padova, in Italia, e presso l’ European Synchrotron Radiation Facility (ESRF) di Grenoble, in Francia. I risultati ottenuti riportano la presenza di interessanti inclusioni di apatite, Ca5(PO4)3[F,OH,Cl], e merrillite, Ca9NaMg(PO4)7, in numerosi cristalli di feldspato di questo meteorite. Inoltre, sono state trovate anche alcune inclusioni di grafite. Questo dualismo osservato tra grafite e cristalli di fosfato è un'interessante associazione mineralogica nelle meteoriti. Essa potrebbe fornire importanti informazioni sui processi magmatici e di differenziazione del corpo genitore. Questa tesi si propone di studiare e proporre un'interpretazione coerente della presenza di queste inclusioni di fosfato e grafite all'interno di questa meteorite, considerando le possibili implicazioni legate all'evoluzione del corpo genitore di questa meteorite.
Studio combinato Raman e SR-XRF delle inclusioni fluide nella meteorite Northwest Africa 6693. Verso l'origine dei fluidi planetari extraterrestri
MARANGONI, FABIO
2023/2024
Abstract
The meteorite Northwest Africa 6693 (NWA 6693) was found in Morocco in March 2011 and classified as ungrouped achondrite. This sample exhibits a distinctive mineralogy and oxygen isotopic composition that is not aligned with any other class of achondrites. This thesis focuses on examining intriguing micrometric inclusions within plagioclase crystals using a polarizing optical microscope, Raman micro-spectroscopy, and X-ray fluorescence using synchrotron radiation. The experimental work was performed at the Department of Geoscience, Goethe University Frankfurt, Germany, at the Department of Geosciences, University of Padova, Italy and at the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. The obtained results report the presence of interesting inclusions of apatite, Ca5(PO4)3[F,OH,Cl], and merrillite, Ca9NaMg(PO4)7, in numerous feldspar crystals of this meteorite. In addition, some graphite inclusions were also found. This observed dualism between graphite and phosphate crystals present in the same inclusion is an interesting mineralogical association in meteorites because they could provide important information about the differentiation and magmatic processes of the parent body. This thesis aims to study and propose a consistent interpretation of the presence of these phosphate and graphite inclusions within this meteorite, considering possible implications related to the evolution of the parent body of this meteorite.| File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/80189