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This thesis purports the electron and Xray microanalysis of planetary materials: from Comet 81P/Wild2 to the surface of Mars. Advanced techniques in electron microscopy and Xray spectroscopy have been developed for the microanalysis of the nakhlite martian meteorites and Comet 81P/Wild2 samples from the Stardust Mission. Electron microprobe analysis and a Focussed Ion Beam Scanning Electron Microscope (FIBSEM) technique for Transmission Electron Microscopy (TEM) was used to analyse the secondary mineral assemblages in the nakhlite martian meteorites. Using these techniques, a model is proposed describing the formation of the nakhlites secondary assemblages by an impactinduced hydrothermal system based on the mineralogical and geochemical differences between different samples. A suite of Stardust cometary samples have also been analysed using FIBTEM and microfocus Xray spectroscopy that includes: Xray Fluorescence Spectroscopy (XRF), Xray Absorption NearEdge Structure (XANES) and Extended Xray Absorption Fine Structure (EXAFS) at the Diamond synchrotron, the understand the composition of Comet 81P/Wild2 and Jupiter Family Comets.
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