Evidences for a Noachian-Hesperian orogeny in Mars |
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Authors: | Francisco Anguita Carlos Fernández Sandra Carrasquilla Andrés Núñez Judit García |
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Institution: | a Departamento de Petrología y Geoquímica, Universidad Complutense, 28040 Madrid, Spain b Seminario de Ciencias Planetarias, Universidad Complutense, 28040 Madrid, Spain c Departamento de Geodinámica y Paleontología, Universidad de Huelva, Campus de El Carmen, 21071 Huelva, Spain d Departamento de Geofísica, Universidad Nacional Autónoma de México, México D.F., Mexico |
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Abstract: | A number of tectonic structures have been located at the Thaumasia Plateau, Daedalia Planum and Aonia Terra, Mars. They include isolated folds with axial traces up to 200 km long, trains of tightly folded structures tens of km long, and thrusts. Their size and geometry are similar to those on Earth, and the direction of compression seems to have varied amply with time, suggesting a complex tectonic evolution. Crater counts on the deformed terrain point to Noachian to Early Hesperian ages. On the basis of the geometry and geological relations of these structures, we propose that they form part of an old martian orogen, the Thaumasia-Aonia Orogen, which embraced not only the Thaumasia Plateau, but areas of Daedalia Planum, Aonia Terra and Nereidum Montes as well. A regional coherent layering is previous to the deformation and could represent the trace of even older stresses on the martian lithosphere. |
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Keywords: | Mars Geological processes Tectonics |
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