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- W2105665664 abstract "Of the features that characterize large shield volcanoes on Mars, flank terraces remainthe most enigmatic. Several competing mechanisms have been proposed for these laterally expansive,topographically subtle landforms. Here we test the hypothesis that horizontal contraction of avolcano in response to the down-flexing of its underlying basement leads to flank terracing. Weperformed a series of analogue models consisting of a conical sand–plaster load emplaced on abasement comprising a layer of brittle sand–plaster atop a reservoir of viscoelastic silicone.Our experiments consistently produced a suite of structures that included a zone of concentricextension distal to the conical load, a flexural trough adjacent to the load base and convexities (terraces)on the cone’s flanks. The effects of variations in the thickness of the brittle basal layer, aswell as in the volume, slope and planform eccentricity of the cone, were also investigated. For agiven cone geometry, we find that terrace formation is enhanced as the brittle basement thicknessdecreases, but that a sufficiently thick brittle layer can enhance the basement’s resistance to loadingsuch that terracing of the cone is reduced or even inhibited altogether. For a given brittle basementthickness, terracing is reduced with decreasing cone slope and/or volume. Our experimental resultscompare well morphologically to observations of terraced edifices on Mars, and so provide aframework with which to understand the developmental history of large shield volcanoes on theRed Planet." @default.
- W2105665664 created "2016-06-24" @default.
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- W2105665664 date "2014-05-08" @default.
- W2105665664 modified "2023-10-16" @default.
- W2105665664 title "Analogue modelling of volcano flank terrace formation on Mars" @default.
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- W2105665664 doi "https://doi.org/10.1144/sp401.14" @default.
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