Brown: Martian Lake System Records Two Water-Related Events

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Brown: Martian Lake System Records Two Water-Related Events

Post by bystander » Thu Mar 26, 2015 9:29 pm

Ancient Martian Lake System Records Two Water-Related Events
Brown University | 2015 Mar 25
[attachment=0]260184main_jezero.jpg[/attachment]
Current and former graduate students at Brown University combined images from NASA’s CTX instrument with mineralogical data from NASA’s CRISM orbiting spectrometer to create a geologic history of flowing water on the surface of Mars nearly 4 billion years ago.

Researchers from Brown University have completed a new analysis of an ancient Martian lake system in Jezero Crater, near the planet’s equator. The study finds that the onslaught of water that filled the crater was one of at least two separate periods of water activity in the region surrounding Jezero.

“We can say that this one really well-exposed location makes a strong case for at least two periods of water-related activity in Mars’ history,” said Tim Goudge, a graduate student at Brown who led the work. “That tells us something really interesting about how early Mars operated.” ...

The ancient lake at Jezero crater was first identified in 2005 by Caleb Fassett, a former Brown graduate student now a professor at Mount Holyoke College. Fassett identified two channels on the northern and western sides of the crater that appear to have supplied it with water. That water eventually overtopped the crater wall on the southern side and flowed out through a third large channel. It’s not clear how long the system was active, but seems to have dried out around 3.5 to 3.8 billion years ago. ...

Assessing the Mineralogy of the Watershed and Fan Deposits of the Jezero Crater Paleolake System, Mars - Timothy A. Goudge et al
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A delta-like fan at the western edge of Jezero Crater marks an area <br />where flowing water would have entered the lake-filled crater and <br />deposited clay minerals transported from the surrounding watershed. <br />(Credit: NASA/JPL/JHUAPL/MSSS/Brown University)
A delta-like fan at the western edge of Jezero Crater marks an area
where flowing water would have entered the lake-filled crater and
deposited clay minerals transported from the surrounding watershed.
(Credit: NASA/JPL/JHUAPL/MSSS/Brown University)
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