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Remote Neutron Spectroscopy On Mars, Christopher Gayle Tate
Remote Neutron Spectroscopy On Mars, Christopher Gayle Tate
Doctoral Dissertations
Remote neutron spectroscopy is an important technique in planetary science that allows for classification of the amount of light elements in a planetary regolith. It is especially suited for studying hydrogen abundances and elements with high thermal neutron absorption cross sections in the top ~1 meter of regolith. The Mars Science Laboratory rover Curiosity carries the first rover based neutron spectrometer Dynamic Albedo of Neutrons (DAN) in Gale crater, Mars. As the DAN instrument operates in passive mode, it is sensitive to neutrons produced through Galactic Cosmic Ray interactions and neutrons generated by the rover's Multi-Mission Radioisotope Thermoelectric Generator. In …
Martian Dune Fields: Aeolian Activity, Morphology, Sediment Pathways, And Provenance, Matthew Chojnacki
Martian Dune Fields: Aeolian Activity, Morphology, Sediment Pathways, And Provenance, Matthew Chojnacki
Doctoral Dissertations
Wind has likely been the dominant geologic agent for most of Mars’ history. The wide-spread nature of sand dunes there shows that near-surface winds have commonly interacted with plentiful mobile sediments. Early studies of these dunes suggested minimal activity, dominantly unidirectional simple dune morphologies, and little variations in basaltic sand compositions. This dissertation examines martian sand dunes and aeolian systems, in terms of their activity, morphologies, thermophysical properties, sand compositions, geologic contexts, and source-lithologies using new higher-resolution orbital data. Although previous evidence for contemporary dune activity has been limited, results presented in Chapter II show substantial activity in Endeavour Crater, …
Constraining Martian Sedimentation Via Analysis Of Stratal Packaging, Intracrater Layered Deposits, Arabia Terra, Mars, Sarah Beth Cadieux
Constraining Martian Sedimentation Via Analysis Of Stratal Packaging, Intracrater Layered Deposits, Arabia Terra, Mars, Sarah Beth Cadieux
Masters Theses
Craters within Arabia Terra, Mars, contain hundreds of meters of layered strata
showing systematic alternation between slope- and cliff-forming units, suggesting either
rhythmic deposition of distinct lithologies or lithologies that experienced differential
cementation. Hypothesized origins of these intercrater layered deposits include
lacustrine, aeolian, volcanic airfall, and impact surge deposition. On Earth, rhythmically
deposited strata can be examined in terms of stratal packaging, wherein the interplay of
tectonics, sediment deposition, and change in base level results in predictable patterns
with respect to changes in the amount of space available for sediment accumulation.
Fundamental differences between tectonic regimes of Earth and Mars …