Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"aqueous alteration"”.
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Attempts to analyse D/H ratios of sub-micromole quantities of hydrogen : applications in the study of ordinary chondrites
… also unusual in that it has undergone some mild aqueous alteration, previously considered a secondary process restricted to some deuterium-rich carbonaceous chondrites. Semarkona was chosen to be the object of a more detailed study of secondary alteration and to determine whether the …
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Using oxygen and carbon stable isotopes, 53Mn-53Cr isotope systematics, and petrology to constrain the history of carbonates and water in the CR and CM chondrite parent bodies
… of time or was heated by impact after most aqueous alteration in carbonaceous chondrites had ceased. This study also presents analyses of carbonates in the same samples (ALH 84049 and GRO 95577) in-situ for their oxygen, and, in ALH 84049, carbon isotope composition to constrain aqueous …
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Fluids in Planetary Systems
… numerical thermodynamic equilibrium modeling of aqueous alteration processes on Mars. Results of impact experiments and analyses of fluid inclusions in rocks from the Ries Crater and Meteor Crater indicate that fluid inclusions reequilibrate systematically with increasing shock pressure: …
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Hydrated silica on Mars: Global comparison and in-depth analysis at Antoniadi Crater
… deposits within suites of minerals that indicate aqueous alteration, mostly because hydrated silica forms easily in different environments. Because of its relative ubiquity on Mars, it makes a good tracer mineral to compare otherwise dissimilar deposits and relate their relative degrees of aqueous …
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Early Water on Mars Hindered Subduction-Driven Plate Tectonics
… and spectral evidence regarding ancient aqueous alteration and fluid-rock interactions on Mars supports my hypothesis. This implies that the hydrologically active history of earlier Mars might have paradoxically contributed to the long-term quiescence of its tectonics.
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Mineralogy and bulk chemistry of chondrules and matrix in petrologic type 3 chondrites : implications for early solar system processes
… metamorphism, sulfidization and low-temperature aqueous alteration. Kakangari chondrules, as they are preserved in the meteorite, are quite different from chondrules in unequilibrated ordinary and carbonaceous chondrites. Kakangari appears to have undergone processing similar to that experienced …
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Deciphering the thermal evolution of small planetary bodies.
… of geological processes, from low temperature aqueous alteration, to explosive volcanism. However, determining certain properties of these asteroid-sized bodies such as their size and structure can be difficult. In this thesis, I use detailed models of planetesimal thermal evolution to …
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NATURAL ANALOGUES OF PLANET MERCURY’S SURFACE: MINERALOGICAL AND SPECTROSCOPIC ASPECTS
… and texture play a key role in spectral alteration under solar wind exposure. The study of boninites provided several insights relevant to Mercury’s surface exploration. First of all, their mineralogy and bulk composition generally match Mercury’s surface. The primary compositional …