Ancient hot springs may have bubbled up at a spot just south of the Martian equator. Left-behind mineral deposits described in a new study are not the first evidence of such features on Mars. But if confirmed, the discovery could affect where NASA’s Mars 2020 mission rover lands to start its hunt for signs of life.
The spot scrutinized in the new study is called Margaritifer Terra. This heavily cratered site with lots of fractures in its surface may have formed from magma or melting rock from asteroid impacts. Analysis of high-resolution images from the Mars Reconnaissance Orbiter suggests not all of the site’s features resulted from volcanic activity or heavy hits to the Martian surface. Certain ridges along fractures in one of the region’s impact craters have mineral deposits that may have come from the upwelling of water from ancient hot springs, researchers report July 15 in Geophysical Research Letters.
Hot springs hint at hydrothermal activity. “That kind of hydrothermal environment is favorable to life on Earth, and may have been so on Mars, too,” says study coauthor Rebecca Thomas of University of Colorado Boulder. Chemical-rich fluids typically flow freely at hydrothermal vents, providing energy for life in a harsh environment. This habitat, Thomas says, can also lay down sulfur- or silica-rich mineral deposits, which are good at preserving evidence of life, most likely microbes in the case of Mars.
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