'Halos' Discovered on Mars Widen Time Frame for Potential Life
Lighter-toned bedrock that surrounds fractures and comprises high concentrations of silica — called “halos”— has been found in Gale crater on Mars, indicating that the planet had liquid water much longer than previously believed. The new finding is reported in a new paper published today in Geophysical Research Letters, a journal of the American Geophysical Union.
“The concentration of silica is very high at the centerlines of these halos,” said Jens Frydenvang, a scientist at Los Alamos National Laboratory and the University of Copenhagen and lead author of the new study. “What we’re seeing is that silica appears to have migrated between very old sedimentary bedrock and into younger overlying rocks.
A mosaic of images from the navigation cameras on the NASA Curiosity rover shows “halos” of lighter-toned bedrock around fractures. These halos comprise high concentrations of silica and indicate that liquid groundwater flowed through the rocks in Gale crater longer than previously believed.
Credit: NASA/JPL-Caltech.
Whether this groundwater could have sustained life remains to be seen. But this new study buttresses recent findings by another Los Alamos scientist who found boron on Mars for the first time, which also indicates the potential for long-term habitable groundwater in the planet’s past.
Curiosity has traveled more than 16 kilometers (10 miles) over almost 1,700 Martian days as it has traveled from the bottom of Gale crater part way up Mount Sharp in the center of the crater. Scientists are using all the data collected by ChemCam to put together a more complete picture of the geological history of Mars.
The elevated silica in halos was found over approximately 20 to 30 meters (66 to 100 feet) in elevation near a rock-layer of ancient lake sediments that had a high silica content.
“This tells us that the silica found in halos in younger rocks close by was likely remobilized from the old sedimentary rocks by water flowing through the fractures,” Frydenvang said. Specifically, some of the rocks containing the halos were deposited by wind, likely as dunes. Such dunes would only exist after the lake had dried up. The presence of halos in rocks formed long after the lake dried out indicates that groundwater was still flowing within the rocks more recently than previously known.
Contacts and sources:
Lauren Lipuma, The American Geophysical Union
Laura Mullane, Los Alamos National Laboratory
Citation: “Diagenetic silica enrichment and late-stage groundwater activity in Gale crater, Mars” http://onlinelibrary.wiley.com/doi/10.1002/2017GL073323/pdf
Source:
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