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Snowball Earth: the global glaciation interrupted by an asteroid

During one of the events of Earth ball-of-snow, the impact of an asteroid could have favored global warming and changed things.

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During one of the events of Earth ball-of-snow, the impact of an asteroid could have favored global warming and changed things.

Illustration - Thus the Earth could have appeared from Space, during one of its periods of global glaciation: a snowball Earth.

During its long history of around 4.5 billion years the Earth has experienced very hot and other very cold periods. Although they are controversial hypotheses, many researchers believe that several times our planet is almost completely covered with ice ( Snowball ). During his speech at the Goldschmidt geochemistry conference(18-23 August 2019) geologist Timmons Erickson (Johnson Space Center) reports that one of these "total ice" events, located around 2,250 million years ago, ended after about 30 million years with global warming of planet that followed the impact of an asteroid. The hypothesis is based on the study of the geological structures in the meteor crater of Yarrabubba (in Australia), which time and geological events have made it difficult to measure but which is believed to be between 30 and 70 kilometers in diameter.
Other global glacial events : Forests, coal and the Earth snowball (about 330 million years ago); The Earth trapped in ice (about 770 million years ago)

According to Erickson, the relationship between the two events - the impact and the end of the global winter - is very strong: "It was the clash between that object and the Earth that helped the latter to shake off the ice sheet", with an impact such as to vaporize millions of cubic kilometers of ice - vapors which then, spreading into the atmosphere, would have led to an increase in global temperature, to the point of causing the melting of eternal snow even at very high distances from the place of the event triggering a chain of events that would transform the Planet.

Numerous impacts with more or less large objects have marked the history of the Earth: the collision that led to the formation of the Moon was certainly the most apocalyptic, but also that which, in the long run, made life on our planet possible. |SHUTTERSTOCK

QUESTION AND ANSWER. However, doubts and disagreements are common for such research. Voicing the doubts was the geobiologist Eva Stüeken (University of St. Andrews, UK), who said that although "the coincidence between the two phenomena is surprising, the Yarrabubba crater has a diameter of about one third compared to that of theChicxulub asteroid in Mexico, which fell 66 million years ago, which was probably responsible for the disappearance of 70 percent of all life on Earth. It seems difficult that a relatively smaller object, such as that fallen in Australia, may have had such repercussions on a planetary level ".

In response, Erickson agreed that there could already be a principle of change taking place, perhaps initiated by a series of massive and centuries-old volcanic eruptions, but that only the impact of that asteroid can justify the acceleration of the phenomenon and the definitive transformation. To confirm his hypothesis Erickson has created a model to verify what consequences an object of about 7 kilometers of diameter could have in the impact with a layer of ice of 2-5 kilometers of thickness. Among the results obtained there is the fact that the impact could have raised a great quantity of dusts in the atmosphere which, falling on the ice elsewhere, would have made them dark, therefore more exposed to melting phenomena; and could have thrown hundreds of billions of tons of steam into the atmosphere,

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GIẢI TRÍ SAO 24H: Snowball Earth: the global glaciation interrupted by an asteroid
Snowball Earth: the global glaciation interrupted by an asteroid
During one of the events of Earth ball-of-snow, the impact of an asteroid could have favored global warming and changed things.
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