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- W114125220 abstract "Detailed study of channels in the Mangala and Kasei Valles regions of Mars strengthens a theory that the authors presented earlier: that channeling episodes have occurred at many different times and by several different mechanisms. The study utilized new, high-resolution, 1:500,000-scale maps compiled as base material for selecting candidate sites for a future Mars rover/lander/sample return spacecraft. Nestus Valles, west of Mangala Valles, are incised in young basaltic lava flows and are overlain by a very young volcanic unit, possibly a pyroclastic deposit. Crater statistics define the relative ages of the volcanic units that bound the ages of the very young, episodic, fluvial events that formed the channels. Samples collected at the Nestus site by a future lander/rover vehicle and returned to Earth for radiometric analysis would determine the age of these events more precisely. Similar relations exists for many small channels northeast of Mangala Valles. Narrow, young channels are incised in the floors of the intermediate-size valleys of Asopus, Hermus, and Abus Valles. At Abus, the mouth of a broad valley is buried by young basalt flows; a younger inner valley cuts into these flows and is buried, in turn, by a younger flow. A lobe of one ofmore » these flow invades and flows part way up the mouth of Taus Valles. In the Kasei Valles region, parts of the older, very broad, Kasei outflow channel are incised by fluvial grooving and contain streamlined islands; a younger, narrower, inner valley cuts the older valley; both valleys are buried by younger lobate basaltic lava flows.« less" @default.
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- W114125220 date "1985-01-01" @default.
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- W114125220 title "Mars channels--new data on ages" @default.
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