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Dark streaks on Mars may be caused by salts and melting ice | Space


February 18, 2021
Researchers at the SETI Institute say that mysterious dark streaks on sun-facing slopes on Mars, debated about for years, may be small landslides caused by a combination of salts and melting ice just below the surface.
A sample of Mars analog crust (imitation Martian soil) containing sulfate salts (blue and pink). The new study suggests that such salts and melting ice just below the surface on Mars could cause the enigmatic dark streaks on sun-facing slopes. Image via Janice Bishop/ SETI Institute.
For years now, scientists have been trying to figure out what causes weird dark streaks on Martian slopes called recurring slope lineae. They tend to be found on sun-facing slopes and keep repeating in the same places, hence the word “recurring” in the name. Different studies have suggested everything from brief flows of briny water or groundwater to dry landslides. A new theory combines elements of both. The intriguing peer-reviewed results were publis ....

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Zack Burton '14 Coauthors Paper on an Enduring Mars Enigma


Zack Burton ’14 Coauthors Paper on an Enduring Mars Enigma
With a team of astrobiologists, Zack Burton ’14 has discovered that underneath the dry, barren landscape of Mars, ice could be melting and mixing with underground salts to cause surface landslides.
Zach Burton in the lab with collaborator Merve Yesilbas, where they performed experiments for the Mars study. 
The biggest clues for the team that Mars might contain secret stores of briny water were these mysterious landslides that have been observed from afar on the planet s arid surface. 
Scientists have long been puzzled by this seasonal phenomenon, known as recurring slope lineae, or RSL, which is most common on sun-facing slopes in the equatorial zone of the red planet. Some have suggested the RSLs are caused by flows of grainy debris, dust, or sand. ....

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Could new theory answer what causes landslides on Mars? | University of Hawaiʻi System News


RSL).
SETI Institute senior research scientist and member of the
NASA Astrobiology Institute team, alternatively hypothesizes that small-scale ice melting underground causes changes that make the surface vulnerable to dust storms and wind. As a result, the features appear or expand on the surface of Mars. Further, the team believes that the thin layers of melting ice result from interactions between underground water ice, chlorine salts and sulfates, which create an unstable, liquid-like flowing slush that instigates sinkholes, ground collapse, surface flows and upheave.
Earth sediments parallel Mars samples
Krupac crater on Mars featuring gullies along the rim. (Photo credit: NASA/ ....

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