Ismenius Cavus, Mars: A deep paleolake with phyllosilicate deposits |
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| Authors: | E Dehouck S Le Mouélic F Poulet |
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| Institution: | a LPGN, CNRS/Universite de Nantes, 44322 Nantes, France
b IAS, CNRS/Universite Paris Sud, 91405 Orsay, France |
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| Abstract: | Ismenius Cavus is a basin where several fluvial valleys converge. Three depositional fan deltas are observed at the valleys outlets at similar elevations. These fans suggest long-term fluvial activity accompanied by a lake inside the basin. The elevational difference between the delta plains and the deepest part of the basin floor implies that this lake was 600 m deep. Iron-magnesium phyllosilicates, which are mapped from near-infrared spectral data, are associated with layered sediments >300 m thick at the base of one of the fans. Stratigraphic relationships with the surrounding plateau show that the valleys are hesperian in age (3.0-3.7 ga), thus dating the lake activity to this period. The coexistence of a deep lake and phyllosilicates demonstrates that persistent bodies of liquid water were present during the hesperian period. |
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| Keywords: | Mars Alteration Phyllosian Fluvial |
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