Solving fossil mystery could aid quest for ancient life on Mars



by Staff Writers



Edinburgh UK (SPX) Nov 28, 2019



The search for evidence of life on Mars could be helped by fresh insights into ancient rocks on Earth.

Research which suggests that structures previously thought to be fossils may, in fact, be mineral deposits could save future Mars missions valuable time and resources.

Microscopic tubes and filaments that resemble the remains of tiny creatures may have been formed by chemical reactions involving iron-rich minerals, the study shows.

Previous research had suggested that such structures were among the oldest fossils on Earth.

The new findings could aid the search for extraterrestrial life during future missions to Mars by making it easier to distinguish between fossils and non-biological structures.

The discovery was made by a scientist from the University of Edinburgh who is developing techniques to seek evidence that life once existed on Mars.

Astrobiologist Sean McMahon created tiny formations in the lab that closely mimic the shape and chemical composition of iron-rich structures commonly found in Mars-like rocks on Earth, where some examples are thought to be around four billion years old.

Dr McMahon created the complex structures by mixing iron-rich particles with alkaline liquids containing the chemicals silicate or carbonate.

This process - known as chemical gardening - is thought to occur naturally where these chemicals abound. It can occur in hydrothermal vents on the seabed and when deep groundwater circulates through pores and fractures in rocks.

His findings suggest that structure alone is not sufficient to confirm whether or not microscopic life-like formations are fossils. More research will be needed to say exactly how they were formed.

The study, published in the journal Proceedings of the Royal Society B, was funded by the European Union's Horizon 2020 programme.

Dr Sean McMahon said: "Chemical reactions like these have been studied for hundreds of years but they had not previously been shown to mimic these tiny iron-rich structures inside rocks. These results call for a re-examination of many ancient real-world examples to see if they are more likely to be fossils or non-biological mineral deposits."

Research paper



Related Links

University of Edinburgh

Mars News and Information at MarsDaily.com

Lunar Dreams and more





Thanks for being here;

We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.



With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.



Our news coverage takes time and effort to publish 365 days a year.



If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution. SpaceDaily Contributor

$5 Billed Once





credit card or paypal

SpaceDaily Monthly Supporter

$5 Billed Monthly





paypal only



Pasadena CA (JPL) Nov 18, 2019

