Once upon a time, thousands of supervolcanoes erupted on Mars

According to the study, the eruptions took place about 4 billion years ago and covered a period of 500 million years. Each of them significantly influenced the climate of Mars: it covered the atmosphere with ash, dust, water vapor, carbon dioxide and sulfur oxide and blocked the light, making the atmosphere colder.

The magnitude of the explosions was enormous – scientists noted that there had never been such powerful eruptions on Earth. As a result, large-scale depressions called calderas appeared on Mars. In the Arabia Terra region, 7 such basins were counted – they were the first evidence of the planet’s volcanic activity. At the same time, until 2013, it was believed that the Martian calderas are the results of asteroid fall.

The researchers explained that the volcanic origin of the basins was indicated by their shape – they were not round, as is usually the case as a result of the collision of planets with asteroids – as well as the composition and distribution of minerals. Their spectrometric analysis indicated that Mars once underwent the effects of volcanic activity.

It is curious that only the Arabia Terra region abounds in traces of the volcanic past of the Red Planet. This indicates that Martian volcanoes may have concentrated within certain zones. But why this happened to scientists is still unknown.

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