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Explosive Martian volcanoes likely spawned weird rock

20 Jun 2018, 13:19 UTC
Explosive Martian volcanoes likely spawned weird rock
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An isolated hill in the Medusae Fossae Formation. The effect of wind erosion on this hill is evident by its streamlined shape. Image credit: High Resolution Stereo Camera/European Space Agency
Explosive volcanic eruptions that shot jets of hot ash, rock and gas skyward are the likely source of a mysterious Martian rock formation, a new study finds. The new finding could add to scientists’ understanding of Mars’ interior and its past potential for habitability.
The Medusae Fossae Formation is a massive, unusual deposit of soft rock near Mars’ equator, with undulating hills and abrupt mesas. Scientists first observed the Medusae Fossae with NASA’s Mariner spacecraft in the 1960s but were perplexed as to how it formed.
Now, new research suggests the formation was deposited during explosive volcanic eruptions on the Red Planet more than 3 billion years ago. The formation is about one-fifth as large as the continental United States and 100 times more massive than the largest explosive volcanic deposit on Earth, making it the largest known explosive volcanic deposit in the solar system, according to the study’s authors.
“This is a massive deposit, not only on a Martian scale, but also in terms of the solar system, because ...

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