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Evolution stuck in slime for a billion years

Date:
February 18, 2014
Source:
Science in Public
Summary:
Researchers are providing a new explanation as to why life remained as little more than slime for a billion years, before rapidly diversifying in the 'Cambrian explosion of life'. Using a new technology originally developed for mineral exploration, the team has shown how varying levels of oxygen and biologically-important elements in the ancient oceans might have triggered the major evolutionary events that brought us here today.
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Professor Large and Professor Maslennikov on the hunt for suitable black shales in Siberia.
Credit: University of Tasmania

Tasmanian researchers have revealed ancient conditions that almost ended life on Earth, using a new technique they developed to hunt for mineral deposits.

The first life developed in the ancient oceans around 3.6 billion years ago, but then nothing much happened. Life remained as little more than a layer of slime for a billion years. Suddenly, 550 million years ago, evolution burst back into action -- and here we are today. So what was the hold-up during those 'boring billion' years?

According to University of Tasmania geologist Professor Ross Large and his international team, the key was a lack of oxygen and nutrient elements, which placed evolution in a precarious position. "During that billion years, oxygen levels declined and the oceans were losing the ingredients needed for life to develop into more complex organisms."

By analysing ancient seafloor rocks, Ross and his Australian, Russian, US and Canadian colleagues were able to show that the slowdown in evolution was tightly linked to low levels of oxygen and biologically-important elements in the oceans.

"We've looked at thousands of samples of the mineral pyrite in rocks that formed in the ancient oceans. And by measuring the levels of certain trace elements in the pyrite, using a technique developed in our labs, we've found that we can tell an accurate story about how much oxygen and nutrients were around billions of years ago."

Their research will be published in the March issue of the journal Earth and Planetary Science Letters.

"We were initially looking at oxygen levels in the ancient oceans and atmosphere to understand how mineral deposits form, and where to look for them today. That's a focus of the Centre for Ore Deposit and Exploration Science (CODES), which we established with ARC and industry funding at UTAS in 1989," Ross explains. "But the technology we have developed to find minerals can also tell us much about the evolution of life."

After an initial burst of oxygen, the study plots a long decline in oxygen levels during the 'boring billion' years before leaping up about 750-550 million years ago. "We think this recovery of oxygen levels led to a significant increase in trace metals in the ocean and triggered the 'Cambrian explosion of life'.

"We will be doing much more with this technology, but it's already becoming clear that there have been many fluctuations in trace metal levels over the millennia and these may help us understand a host of events including the emergence of life, fish, plants and dinosaurs, mass extinctions, and the development of seafloor gold and other ore deposits," says Ross.


Story Source:

The above post is reprinted from materials provided by Science in Public. Note: Materials may be edited for content and length.


Journal Reference:

  1. Ross R. Large, Jacqueline A. Halpin, Leonid V. Danyushevsky, Valeriy V. Maslennikov, Stuart W. Bull, John A. Long, Daniel D. Gregory, Elena Lounejeva, Timothy W. Lyons, Patrick J. Sack, Peter J. McGoldrick, Clive R. Calver. Trace element content of sedimentary pyrite as a new proxy for deep-time ocean–atmosphere evolution. Earth and Planetary Science Letters, 2014; 389: 209 DOI: 10.1016/j.epsl.2013.12.020

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Science in Public. "Evolution stuck in slime for a billion years." ScienceDaily. ScienceDaily, 18 February 2014. <www.sciencedaily.com/releases/2014/02/140218143318.htm>.
Science in Public. (2014, February 18). Evolution stuck in slime for a billion years. ScienceDaily. Retrieved August 28, 2015 from www.sciencedaily.com/releases/2014/02/140218143318.htm
Science in Public. "Evolution stuck in slime for a billion years." ScienceDaily. www.sciencedaily.com/releases/2014/02/140218143318.htm (accessed August 28, 2015).

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