Origin of circular collapsed landforms in the Chryse region of Mars
| Autor: | Roda, M., Kleinhans, M.G., Zegers, T.E., Govers, R., NWO-NSO: Chaotic terrains on Mars: testing the subsurface lake hypothesis, Coastal dynamics, Fluvial systems and Global change, Tectonophysics, Biogeomorphology of Rivers and Estuaries, Paleomagnetism |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Martian
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Landform Ices Impact processes Sediment Collapse (topology) Mars Astronomy and Astrophysics Mars Exploration Program 01 natural sciences Impact crater Space and Planetary Science 0103 physical sciences Taverne Linear relation surface Statistical analysis Geological processes 010303 astronomy & astrophysics Geomorphology Geology 0105 earth and related environmental sciences |
| Zdroj: | Icarus, 265, 70. Academic Press Inc. |
| ISSN: | 0019-1035 |
| Popis: | The quasi-circular collapsed landforms occurring in the Chryse region of Mars share similar morphological characteristics, such as depth of collapse and polygonally fractured floors. Here, we present a statistical analysis of diameter, maximum and minimum depth, and amount of collapse of these features. Based on their morphometric characteristics, we find that these landforms have a common origin. In particular, the investigated landforms show diameter-depth correlations similar to those that impact craters of equivalent diameters exhibit. We also find that the observed amount of collapse of the collected features is strongly correlated to their diameter. Furthermore, the linear relation between minimum filling and pristine depth of craters, the constant ratio between collapse and the amount of filling and the fractured and chaotic aspect of the filling agree with melting and subsequent collapse of an ice layer below a sediment layer. This interpretation is consistent with a buried sub-ice lake scenario, which is a non-climatic mechanism for producing and storing abundant liquid water under martian conditions. |
| Databáze: | OpenAIRE |
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