Water was flowing on Mars 200,000 years ago – scientists
Swedish scientists from the Department of Earth Sciences at the
University of Gothenburg identified “Very young …and
well-preserved deposits of water bearing debris flows in a
mid-latitude crater on Mars,” according to the study
published in the journal Icarus.
It was previously estimated that liquid water flowed across the Red Planet during its last ‘ice-age’, some 400,000 years ago. However, the young age of the crater means the features signifying water must have appeared since.
The scientists drew comparisons between the geomorphological land formations and the Norwegian archipelago of Svalbard. The crater had features of areas on earth where debris flow had caused material to be deposited by fast-flowing water.
“Our fieldwork on Svalbard confirmed our interpretation of the Martian deposits,” stated Andreas Johnsson, a spokesperson for the research team.
“Our study crater on Mars is far too young to have been influenced by the conditions that were prevalent then. This suggests that the meltwater-related processes that formed these deposits have been exceptionally effective also in more recent times,” said Johnsson.
“If we find on Mars evidence for a second genesis, that changes everything,” Johnsson added.
A debris flow takes place when liquid water soaks through debris lying on an incline to the point that it becomes saturated and heavy, causing it to descend down the incline.
On earth, debris flow can result in material destruction and sometimes casualties, depending upon their severity.
When the flow stops, new landforms are made, including lobate deposits and paired levees. It is these that Johnsson has identified on the planet.
“Gullies are common on Mars, but the ones which have been studied previously are older, and the sediments where they have formed are associated with the most recent ice age. Our study crater on Mars is far too young to have been influenced by the conditions that were prevalent then,” Johnson said.