Posted by tourdemars to Meteorites at October 22, 2013 3:34 PMA meteorite reveals clues to how Mars lost its thick, carbon dioxide-rich atmosphere and became a cold, rocky desert, researchers say. They say the Lafayette meteorite shows signs of carbonation - where minerals absorb CO2 in a reaction with water. Mars lost its protective blanket about 4 billion years ago, perhaps because of the loss of its magnetic field, space impacts, or chemical processes. Carbonation may be the key factor, they write in Nature Communications.
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