More Ancient Hot Springs Discovered on Mars?
Written by Nancy Atkinson
In March 2007, the Spirit rover found a patch of bright-colored soil rich in silica. Scientists proposed water must have been involved in creating the region, and not just water, but hot water. Now, data from retrieved from the Mars Reconnaissance Orbiter (MRO) suggest the discovery of another ancient hot springs region in Vernal Crater in Arabia Terra, an area in the northern hemisphere of Mars that is densely cratered and heavily eroded. The research team says the striking similarities between these features on Mars and hot springs found on Earth provide evidence of an ancient Martian hot-spring environment. On Earth these environments teem with microbial life.
If life forms have ever been present on Mars, hot spring deposits would be ideal locations to search for physical or chemical evidence of these organisms and could be target areas for future exploratory missions such as the Mars Science Labortory. Arabia Terra is currently on the list of possible landing sites for MSL.
In their research paper "A Case for Ancient Springs in Arabia Terra, Mars," Carlton C. Allen and Dorothy Z. Oehler, from the Astromaterials Research and Exploration Science Directorate at the NASA Johnson Space Center, Houston, Texas, propose that new image data from the HiRISE (High Resolution Imaging Science Experiment) camera on MRO show structures in Vernal Crater that appear to be the product of ancient spring activity. The data suggest that the southern part of Vernal Crater has experienced episodes of water flow from underground to the surface and may be a site where Martian life could have developed.
Vernal Crater is a 55-km diameter crater located at 6°N, 355.5°E, in the southwestern part of Arabia Terra. From orbital images, the crater appears to have layered sediments, and potentially, remnants of activity from water.
THEMIS image A. Credit: Allen and Oehler
One feature that is bright in both daytime and nighttime in THEMIS infrared images is prominent in the southern part of Vernal crater. In this image, marked A, the feature appears dark, as the THEMIS grayscale was inverted to resemble HiRISE images in the visible range. The feature is 3 km wide and is composed of alternating light-toned and dark-toned subunits, which the researchers interpret as cemented, resistant dunes,and water-laid deposits.
The research team compares this and other structures in the region with hot springs regions on Earth, using Google Earth. The similarities of the features on Mars and Earth, the researchers say, provides a strong case that the Vernal Crater structures are relics of ancient Martian springs.
Regional view of aligned outcrops. CTX image P04_002456_1858. Credit: Allen and Oehlers
The team says their results are consistent with the growing body of orbital and rover data that is suggestive of widespread hydrothermal activity and possible spring deposits elsewhere on Mars.
"If clays or chemical precipitates such as evaporates or silica comprise the terraced structures or tonal anomalies, signatures of that life may be preserved in those minerals," write the research team in their paper. "The fact that several other potential spring deposits occur on-trend with Vernal structures suggests that this may have been a significant province of long-lasting spring activity."
Filed under: Astrobiology, Mars
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February 14th, 2009 at 4:38 pm
Ah, here are the photos at last… I was looking for the Vernal crater and I couldn't find them anywhere.
Here, the hot springs are clearly visible.
February 15th, 2009 at 5:32 am
So where is this crater in relation to the Methane observed?
February 15th, 2009 at 7:01 am
Ah, but for the insight of just one senior field geologist poking about with a rock pick.
February 15th, 2009 at 7:57 am
At one point I read some articles that said there might be some sort of gas geysers. Vaporizing ice or something like that.
February 15th, 2009 at 2:17 pm
How do they know all this stuff? This has to be way technical.
February 15th, 2009 at 3:59 pm
That's nothing. I used to be a homeless rodeo clown but now I am a world class magician !
February 16th, 2009 at 4:59 am
Let's face facts, Any life died 4 Billion years ago. It's fear of being alone in such a giant uncaring universe that drives all this. Let's try Europa instead !!!
February 17th, 2009 at 6:51 pm
should have included a kml file for google mars
February 19th, 2009 at 7:03 am
So where is this crater in relation to the Methane observed??
February 20th, 2009 at 1:56 am
Let's face facts, Any life died 4 Billion years ago. It's fear of being alone in such a giant uncaring universe that drives all this. Let's try Europa instead !!!.
February 25th, 2009 at 8:07 am
should have included a kml file for google mars.
March 3rd, 2009 at 9:59 am
Ah, but for the insight of just one senior field geologist poking about with a rock pick..