Spillover Paleoflood Channels on Mars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

We investigated spillover paleoflood channels connecting large basins in the northern plains of Mars. These channels are one of several types of direct evidence for the existance of large volumes of water on the surface during certain episodes of Martian history. Among the channels, the most spectacular are a group of braided channels (20N, 175) connecting the Elysium and Amazonis basins. This entire system is about 500 km long and up to 130 km wide. Based on the photoclinometric measurements of the channel geometry, we estimated that the scale of flooding could have been comparable to that of the catastrophic Lake Missoula floods on Earth. Recently discovered terrestrial paleoflood spillways connecting basins in central Asia are analogous to these Martian spillover channels in both their scale and their likely formation mechanisms.

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