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Full-Text Articles in Physical Sciences and Mathematics
Compositional Variations Of Titan's Impact Craters Indicates Active Surface Erosion, Alyssa Werynski
Compositional Variations Of Titan's Impact Craters Indicates Active Surface Erosion, Alyssa Werynski
Electronic Thesis and Dissertation Repository
Impact craters on Titan are relatively scarce, but provide ample information about the subsurface properties and modification processes present there. This study utilizes impact craters to examine compositional variations across Titan’s surface and their subsequent modification. Fifteen craters and their ejecta blankets were studied. Subsurface composition was inferred from emissivity data from Cassini’s RADAR instrument, and surficial composition from Cassini’s Visible and Infrared Mapping Spectrometer (VIMS). Results show subsurface composition of these craters is controlled by their degradation state and local environment. Older craters are more infilled with organics than younger, and dunes craters show more organic enrichment than plains …
Morphology And Morphometry Of Double Layered Ejecta Craters On Mars, Ryan Schwegman
Morphology And Morphometry Of Double Layered Ejecta Craters On Mars, Ryan Schwegman
Electronic Thesis and Dissertation Repository
Double layered ejecta (DLE) craters display two distinct layers of ejecta that appear to have been emplaced as a mobile, ground-hugging flow. While volatile content within the target, atmosphere, or some combination of the two is generally considered a major variable enhancing the mobility of ejecta, the presence of unconsolidated surface materials may also have some effect. This statement is studied further here, aiming to determine whether bulk target lithology and/or attributes of the surface have any effect on morphometric properties between DLEs situated on sedimentary targets to those on volcanic ones. Results suggest that ejecta mobility (the distance ejecta …
Morphological And Structural Mapping Of The Oudemans Impact Crater Layered Central Uplift, Mars, Bahareh Kasmai
Morphological And Structural Mapping Of The Oudemans Impact Crater Layered Central Uplift, Mars, Bahareh Kasmai
Electronic Thesis and Dissertation Repository
Central uplifts in large meteorite impact craters provide valuable information about the subsurface geology of planetary bodies. Compared to impact craters on Earth, Martian central uplifts can be well exposed and can be mapped in detail by using satellite imagery. Central uplifts preserve morphological and structural features formed as result of the combination of emplacement during the impact process, post impact modification, and erosion over time. In this study, the Oudemans Crater central uplift (the largest central uplift with layers on Mars) was investigated. Oudemans (9.89 S, 268.1 E) is 124 km in diameter and is located in the Sinai …
Planetary Materials Science And Astrobiology, Matthew R. M. Izawa
Planetary Materials Science And Astrobiology, Matthew R. M. Izawa
Electronic Thesis and Dissertation Repository
Planetary materials contain signatures of diverse processes in their mineralogy, chemistry, textures and assemblages. The record contained in planetary materials reflects the complex and commonly overprinting relationships between many processes. Discerning what mechanisms have operated to produce the rocks we observe requires first a careful characterization of various properties. These include the chemical and structural makeup of the rocks (that is, the mineralogy and mineral chemistry), the textural relations within and between rocks (petrology) Therefore, the key to how the studies here hold together is also in the methodology and guiding philosophy: understanding what is there (what atoms and how …