Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Etats Unis → 2017 → Evaluating Fault-Line Escarpment exposure in the Guadalupe Mountains of west Texas and New Mexico

Western Kentucky University (2017)

Evaluating Fault-Line Escarpment exposure in the Guadalupe Mountains of west Texas and New Mexico

Happel, Audrey Anne,

Titre : Evaluating Fault-Line Escarpment exposure in the Guadalupe Mountains of west Texas and New Mexico

Auteur : Happel, Audrey Anne,

Université de soutenance : Western Kentucky University

Grade : Master of Science (MS) 2017

Résumé partiel
The Permian stratigraphy of the Guadalupe Mountains is well-known due to the impeccable exposure of Permian strata along distinct escarpments that define the boundaries of the range. Even though the Permian strata have been closely examined to understand the associated petroleum reservoirs in the adjacent Delaware basin, little work has been done on the escarpments that expose the well-known rocks at the surface by way of tectonic and erosional processes. The development of escarpments are directly affected by multiple processes that create the landscape, and can be used as a tool to temporally and spatially constrain tectonic and erosional activity (Phillips et al., 2003). Distinct fault escarpments define the western margin of the range and provide an interesting location to study interactions between climatic, tectonic and erosional processes using bedrock exposure near the Rio Grande Rift. In-situ produced cosmogenic nuclides, 10Be and 36Cl, are used as tools to effectively measure the exposure of bedrock surfaces along western escarpments in the Guadalupe Mountains. In total, ten bedrock samples were collected from the top and bottom of five different mapped fault segments to measure exposure ages and erosion rates along the western boundary of the mountain range to learn about the geomorphic history of the region. The cosmogenic nuclide concentrations measured in these rock samples were used to calculate exposure ages, which resulted in Pleistocene exposure ages. Results also indicate the landscape achieved steady-state conditions, suggesting that the mechanisms driving erosion in this tectonic and climatic regime have remained similar over the timescale represented

Présentation

Version intégrale (3,0 Mb)

Page publiée le 28 décembre 2022