Tag Archives: volcanic ash

Many bedrock plains are clastic rocks, not lavas

The Martian surface is dominated by loose dust, sands, and rocks, but high spatial resolution imaging has permitted the detection of numerous flat-lying exposures of ancient, intact bedrock. These “bedrock plains” have previously been interpreted as lava sequences, perhaps similar … Continue reading

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Thaumasia’s volcanic clues to Mars evolution

Researcher Don Hood from Louisiana State University and colleagues at collaborating universities studied an unusual region on Mars — an area with high elevation called Thaumasia Planum. They analyzed the geography and mineralogy of this area they termed Greater Thaumasia, which … Continue reading

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Supervolcanos in Arabia on Mars: Update

The idea of giant volcanos erupting in Arabia was proposed by Joseph Michalski (Planetary Science Institute) in a talk at the Lunar and Planetary Science Conference in March 2013. Michalski and coauthor Jacob Bleacher (NASA Goddard Space Flight Center) have … Continue reading

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Explosive eruptions in dense ancient atmospheres

Explosive volcanic eruptions on an earlier Mars with a thicker atmosphere would have scattered fine ash (pyroclastic debris) mainly east or west of the volcano, a new study finds. Also, a denser ancient atmosphere supports the addition of Arsia and … Continue reading

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