Navigation Links
Researchers find smoking gun of world's biggest extinction
Date:1/23/2011

About 250 million years about 95 per cent of life was wiped out in the sea and 70 per cent on land. Researchers at the University of Calgary believe they have discovered evidence to support massive volcanic eruptions burnt significant volumes of coal, producing ash clouds that had broad impact on global oceans.

"This could literally be the smoking gun that explains the latest Permian extinction," says Dr. Steve Grasby, adjunct professor in the University of Calgary's Department of Geoscience and research scientist at Natural Resources Canada.

Grasby and colleagues discovered layers of coal ash in rocks from the extinction boundary in Canada's High Arctic that give the first direct proof to support this and have published their findings in Nature Geoscience.

Unlike end of dinosaurs, 65 million years ago, where there is widespread belief that the impact of a meteorite was at least the partial cause, it is unclear what caused the late Permian extinction. Previous researchers have suggested massive volcanic eruptions through coal beds in Siberia would generate significant greenhouse gases causing run away global warming.

"Our research is the first to show direct evidence that massive volcanic eruptions the largest the world has ever witnessed caused massive coal combustion thus supporting models for significant generation of greenhouse gases at this time," says Grasby.

At the time of the extinction, the Earth contained one big land mass, a supercontinent known as Pangaea. The environment ranged from desert to lush forest. Four-limbed vertebrates were becoming more diverse and among them were primitive amphibians, early reptiles and synapsids: the group that would, one day, include mammals.

The location of volcanoes, known as the Siberian Traps, are now found in northern Russia, centred around the Siberian city Tura and also encompass Yakutsk, Noril'sk and Irkutsk. They cover an area just under two-million-square kilometers, a size greater than that of Europe. The ash plumes from the volcanoes traveled to regions now in Canada's arctic where coal-ash layers where found.

Grasby studied the formations with Dr. Benoit Beauchamp, a professor in the Department of Geoscience at the University of Calgary. They called upon Dr. Hamed Sanei adjunct professor at the University of Calgary and a researcher at NRCan to look at some of peculiar organic layers they had discovered.

"We saw layers with abundant organic matter and Hamed immediately determined that they were layers of coal-ash, exactly like that produced by modern coal burning power plants," says Beauchamp.

Sanei adds: "Our discovery provides the first direct confirmation for coal ash during this extinction as it may not have been recognized before."

The ash, the authors suggest, may have caused even more trouble for a planet that was already heating up with its oceans starting to suffocate because of decreasing oxygen levels.

"It was a really bad time on Earth. In addition to these volcanoes causing fires through coal, the ash it spewed was highly toxic and was released in the land and water, potentially contributing to the worst extinction event in earth history," says Grasby.


'/>"/>

Contact: Leanne Yohemas
leanne.yohemas@ucalgary.ca
403-540-6552
University of Calgary
Source:Eurekalert  

Related biology news :

1. 2 bacterial enzymes confer resistanceto common herbicide, say MU researchers
2. Go figure: Math model may help researchers with stem cell, cancer therapies
3. Researchers discover giant crayfish species right under their noses
4. Researchers unlock how progesterone increases breast cancer risk
5. In scientific first, researchers visualize naturally occurring mRNA
6. Researchers report on the early development of anti-HIV neutralizing antibodies
7. Researchers learn why PSA levels reflect prostate cancer progression
8. Adrenaline receptor frozen in action by VIB researchers
9. Researchers show how 1 gene becomes 2 (with different functions)
10. Technique allows researchers to identify key maize genes for increased yield
11. University of Houston researchers helping Pentagon build mind-controlled prosthetics
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Researchers find smoking gun of world's biggest extinction
(Date:3/24/2017)... The Controller General of Immigration from Maldives Mr. Mohamed ... received the prestigious international IAIR Award for the most innovative high security ... ... Maldives Immigration Controller General, ... picture on the right) have received the IAIR award for the "Most ...
(Date:3/23/2017)... The report "Gesture Recognition and Touchless Sensing Market by Technology (Touch-based and ... 2022", published by MarketsandMarkets, the market is expected to be worth USD 18.98 ... Continue Reading ... ...      ...
(Date:3/22/2017)...   Neurotechnology , a provider of high-precision ... the release of the SentiVeillance 6.0 ... recognition using up to 10 surveillance, security and ... new version uses deep neural-network-based facial detection and ... a Graphing Processing Unit (GPU) for enhanced speed. ...
Breaking Biology News(10 mins):
(Date:7/26/2017)... ... July 26, 2017 , ... ... towards leveraging the years of diagnostic excellence by Mayo Clinic and the experience ... product suite will be distributed through the Microsoft Azure platform and will focus ...
(Date:7/25/2017)... ... July 25, 2017 , ... ... Heinz as Executive Director of Strategic Planning. His extensive background in consulting, ... Chuck’s professional experience encompasses marketing and differentiation consulting, business strategy development, new ...
(Date:7/24/2017)... FL (PRWEB) , ... July ... ... Strategic Analyst, Kenny Soulstring, today announced that the stock market news outlet ... in risk assessment diagnostic testing that screens and identifies exposure, progression and ...
(Date:7/20/2017)... ... July 20, 2017 , ... VIC Technology Venture Development™ (VIC™), is ... directors. This addition continues to strengthen and diversify VIC’s board. , "We are ... “He is a highly accomplished business executive with a broad range of experience directly ...
Breaking Biology Technology: