The dispersal of pyroclasts from ancient explosive volcanoes on Mars: Implications for the friable layered deposits |
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Authors: | Laura Kerber James W Head Jean-Baptiste Madeleine François Forget Lionel Wilson |
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Institution: | 1. Department of Geological Sciences, Brown University, Providence, RI 02912, United States;2. Laboratoire de Météorologie Dynamique, CNRS/UPMC/IPSL, 4 Place Jussieu, BP99, 75252 Paris Cedex 05, France;3. Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, United Kingdom |
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Abstract: | A number of voluminous, fine-grained, friable deposits have been mapped on Mars. The modes of origin for these deposits are debated. The feasibility for an origin by volcanic airfall for the friable deposits is tested using a global circulation model to simulate the dispersal of pyroclasts from candidate source volcanoes near each deposit. It is concluded that the Medusae Fossae Formation and Electris deposits are easily formed through volcanic processes, and that the Hellas deposits and south polar pitted deposits could have some contribution from volcanic sources in specific atmospheric regimes. The Arabia and Argyre deposits are not well replicated by modeled pyroclast dispersal, suggesting that these deposits were most likely emplaced by other means. |
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