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 “"Giant impact"”.
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The Mercurian magma ocean, first crust, and implications for planetary formation mechanisms
… require silicate removal, perhaps by a giant impact, to create the planet's large core fraction. The earliest crusts expected in a giant impact scenario are discussed in comparison to the endogenous model. We find that the endogenous model can produce a large core with either a …
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Magnetized models for the formation of the moon
… the origin of the Moon suggests that a planetary impactor struck the proto-Earth in an oblique collision shortly after the formation of the solar system. The giant impact produces liquid and vapor debris, drawn from the proto-Earth and impactor. The debris either escapes the system, falls back to …
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Global Surface Modification of Asteroid 4 Vesta Following the Rheasilvia Impact
… analyzing the body. A geologically young (~1 Ga) giant impact basin, Rheasilvia, which has a diameter nearly equal to that of Vesta, dominates Vesta’s southern hemisphere. In addition to opening a massive crater, the impact that formed the Rheasilvia basin produced a shockwave that was …
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Examining the evidence for Chthonian planets : superdense exposed exoplanet cores
… them to the Fossilized Core Theory and the Giant Impact Theory of formation. Additionally, while there are 19 superdense core candidates, they represent only 11 solar systems. We find that both theories plausibly describe the formation of these superdense candidates, and note that all …
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Iron Isotope Cosmochemistry
… processes such as the moon-forming giant impact, core-mantle segregation, and crust formation. In this dissertation, I report the most complete dataset of high-precision iron isotope compositions of a wide range of extraterrestrial samples including carbonaceous, ordinary, and …
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Probing planetary system histories via observations, experiments, and modelling of circumstellar gas and dust
… observations of the system is that of a giant impact; the CO gas is likely the remnant of a stripped planetary atmosphere, while the dust is debris produced in the collision. These observations provide evidence for giant impacts in systems other than our own. The third approach simulates …
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Experimental simulation of Lunar Magma Ocean crystallization : insights into mantle composition and the source regions of lunar basaltic magmatism
Crystallization of the Lunar Magma Ocean has been empirically modeled and its products inferred from sample observations, but it has never been fully tested experimentally. Presented in this study is the first experimental simulation of lunar differentiation. Two end-member bulk Moon compositions …
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Phosphorus Pathways In Deep Time
… hugely variable throughout this monomict impact breccia. I propose a paragenetic history for P-bearing phases in Chelyabinsk involving initial phosphate growth via P-rich olivine replacement, followed by phosphate deformation during an early impact event. This event was also responsible …