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Full-Text Articles in Physical Sciences and Mathematics
New Insights Into The Martian Crust And Angrite Parent Body Through Meteorites, Alison R. Santos
New Insights Into The Martian Crust And Angrite Parent Body Through Meteorites, Alison R. Santos
Earth and Planetary Sciences ETDs
Petrologic studies of two new, unique meteorites were conducted in order to characterize the samples and provide insights into their parent bodies. The first sample, Northwest Africa 7034, is the first martian meteorite breccia to be discovered. In an effort to understand the martian crustal materials sampled by the breccia, we developed a classification scheme for the breccia clasts based on their texture, mineralogy, and chemistry. We then further investigated two clast groups which contained trends in mineralogy and chemistry that suggested a possible genetic relationship between the two. Our findings suggest they are not related by a simple igneous …
Geomorphology, Stratigraphy, And Paleohydrology Of The Aeolis Dorsa Region, Mars, With Insights From Modern And Ancient Terrestrial Analogs, Robert Eric Jacobsen Ii
Geomorphology, Stratigraphy, And Paleohydrology Of The Aeolis Dorsa Region, Mars, With Insights From Modern And Ancient Terrestrial Analogs, Robert Eric Jacobsen Ii
Doctoral Dissertations
Ancient fluvial features on Mars evidence past episodes of hydrologic activity and paleoclimate conditions suitable for liquid water. The Aeolis Dorsa region preserves the most numerous and diverse assemblage of fluvial features yet observed on Mars and many of these features have experienced a history of burial, exhumation, and topographic inversion. This dissertation describes analyses of visual images and topography of Mars and complementary analyses of fluvial analogs on Earth. These analyses provide information about the styles of fluvial activity, magnitudes of paleodischarge, changes in slope, and inferences about Martian paleoclimate conditions. Results indicate that the Aeolis Dorsa deposits encapsulate …
Martian Gully Formation And Evolution: Studies From The Local To Global Scale, Tanya Nicole Harrison
Martian Gully Formation And Evolution: Studies From The Local To Global Scale, Tanya Nicole Harrison
Electronic Thesis and Dissertation Repository
Gullies in the mid- and high-latitudes of Mars were first observed in Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) images in 1997. Appearing to be geologically young, they quickly became a feature of interest due to the implication of liquid water in their formation based on distinct morphological characteristics including incised channels, many exhibiting features indicative of fluid flow. However, the temperature and pressure conditions on the surface of Mars during its most recent geologic era have not been conducive to sustaining water in the liquid phase for extended periods of time; therefore, a number of “wet” (water-related) and …
A Textural Image Analysis Study Of Mars-Analog Sediment: Comparisons Of 2d And 3d Textural Analysis Methods, Image Resolution, And The Effects Of Shadows, Mary Agnes Eibl
A Textural Image Analysis Study Of Mars-Analog Sediment: Comparisons Of 2d And 3d Textural Analysis Methods, Image Resolution, And The Effects Of Shadows, Mary Agnes Eibl
Masters Theses
Sediments from Mars-analog, basaltic, aeolian (Moses Lake dunes, WA) and fluvial (Death Valley region, CA) environments were analyzed for textural properties (grain size, roundness, sphericity) to understand how well image-based analyses compare with actual sediment characteristics. Three interrelated studies determined: (1) how well high-resolution, two-dimensional (2D) image analysis compares with three-dimensional (3D) sediment textures, (2) the extent to which decreasing image resolution affects textural analyses by comparison with high-resolution images, and (3) the extent to which shadows at different incident solar angles has on textural measurements. In both aeolian and fluvial environments, 2D grain-size distributions and statistics closely match 3D …
Cl In The Early Solar System, Jeffrey Williams
Cl In The Early Solar System, Jeffrey Williams
Earth and Planetary Sciences ETDs
The early solar nebula is thought to have been a turbulent disk of dust and gas. An unknown mechanism caused the disk to collapse, such as a nearby super nova. This collapse led to high temperatures and high particle densities at the mid-plane of the disk. An unknown mechanism caused the temperature in local area to become hot enough to cause some material to melt –creating the first igneous material of the solar system. These melt spherules, called chondrules, cooled and accreted together with dust and ice to form larger bodies called chondrites. Once the chondritic bodies were of sufficient …
Sedimentology And Stratigraphy Of The Middle Jurassic Preuss Sandstonein Northern Utah And Eastern Idaho, Preston Scott Cook
Sedimentology And Stratigraphy Of The Middle Jurassic Preuss Sandstonein Northern Utah And Eastern Idaho, Preston Scott Cook
Theses and Dissertations
The purpose of this study is to analyze the sedimentology and stratigraphy of the Middle Jurassic Preuss Sandstone and re-evaluate past sedimentological interpretations. The Preuss is located in northern Utah, western Wyoming and eastern Idaho and is stratigraphically equivalent to the Entrada Sandstone, which is Callovian in age (Dossett et al., 2014). This study is the first attempt at 1) a sequence stratigraphic framework, 2) a petroleum system analysis and 3) an extraterrestrial analog study for the Preuss. This study frames the Preuss within three broad facies groups: marine, coastal and terrestrial. The marine group includes the open marine and …
A New Volcanic Event Recurrence Rate Model And Code For Estimating Uncertainty In Recurrence Rate And Volume Flux Through Time With Selected Examples, James Adams Wilson
A New Volcanic Event Recurrence Rate Model And Code For Estimating Uncertainty In Recurrence Rate And Volume Flux Through Time With Selected Examples, James Adams Wilson
USF Tampa Graduate Theses and Dissertations
Recurrence rate is often used to describe volcanic activity. There are numerous documented ex- amples of non-constant recurrence rate (e.g. Dohrenwend et al., 1984; Condit and Connor, 1996; Cronin et al., 2001; Bebbington and Cronin, 2011; Bevilacqua, 2015), but current techniques for calculating recurrence rate are unable to fully account for temporal changes in recurrence rate. A local–window recurrence rate model, which allows for non-constant recurrence rate, is used to calculate recurrence rate from an age model consisting of estimated ages of volcanic eruption from a Monte Carlo simulation. The Monte Carlo age assignment algorithm utilizes paleomagnetic and stratigraphic information …