Mineral Found On Mars Could Be Linked To Microbes
Scientists have discovered that the earliest living organisms on Earth were capable of making a mineral that may be found on Mars.
The clay-mineral stevensite has been used since ancient times and was used by Nubian women as a beauty treatment, but scientists had believed deposits could only be formed in harsh conditions like volcanic lava and hot alkali lakes.
Researchers led by Dr Bob Burne from The Australian National University (ANU) have found living microbes create an environment that allows stevensite to form, raising new questions about the stevensite found on Mars.
“It’s much more likely that the stevensite on Mars is made geologically, from volcanic activity,” Dr Burne said.
“But our finding – that stevensite can form around biological organisms – will encourage re-interpretation of these Martian deposits and their possible links to life on that planet.”
Dr Burne and his colleagues from ANU, University of Western Australia (UWA) and rock imaging company Lithicon, have found microbes can become encrusted by stevensite, which protects their delicate insides and provides the rigidity to allow them to build reef-like structures called “microbialites”.
“Microbialites are the earliest large-scale evidence of life on Earth,” Dr Burne said.
“They demonstrate how microscopic organisms are able to join together to build enormous structures that sometimes rivalled the size of today’s coral reefs.”
He said the process still happens today in some isolated places like Shark Bay and Lake Clifton in Western Australia.
“Stevensite is usually assumed to require highly alkaline conditions to form, such as volcanic soda lakes. But our stevensite microbialites grow in a lake less salty than seawater and with near-neutral pH.”
One of the paper’s authors, Dr Penny King from ANU, is a science co-investigator on NASA’s Mars Curiosity rover, which uncovered the presence of possible Martian stevensite.
The findings also have implications for how some of the world’s largest oil reservoirs were formed.
Source: http://www.redorbit.com/news/space/1113150787/mineral-found-on-mars-could-be-linked-to-microbes-052014/
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