Navigation Links
Earth's Oxygen May Have Arrived Earlier

Scientists push back emergence of life-giving element by 100 million years

THURSDAY, Sept. 27 (HealthDay News) -- Traces of oxygen may have been present in Earth's atmosphere 50 million to 100 million years earlier than previously thought, according to two international research teams reporting in the Sept. 28 issue of the journal Science.

Most geoscientists believe that atmospheric oxygen levels increased sharply from very low levels during the Great Oxidation Event, which occurred between 2.3 billion and 2.4 billion years ago. There has been great debate about the amount of oxygen existing before that event, according to background information in a news release about the new research.

The new studies provide "compelling new evidence" of early oxygen and lead to the question of whether it's possible to find evidence that oxygen was produced even earlier, said biogeochemist Ariel Anbar, an associate professor in Arizona State University's School of Earth and Space Exploration and department of chemistry and biochemistry in the College of Liberal Arts and Sciences.

Anbar led one of the research teams and was a member of the other team.

By analyzing layers of a kilometer-long core sample of sedimentary rock taken from the Hamersley Basin in Western Australia, the researchers found evidence that oxygen was present in Earth's oceans and possibly in the atmosphere 2.5 billion years ago.

"We seem to have captured a piece of time before the Great Oxidation Event during which the amount of oxygen was actually changing -- caught in the act, as it were," Anbar said in a prepared statement.

"Studying the dynamics that gave rise to the presence of oxygen in Earth's atmosphere deepens our appreciation of the complex interaction between biology and geochemistry," Carl Pilcher, director of the NASA Astrobiology Institute, said in a prepared statement. The institute helped fund the research.

The findings "support the idea that our planet and the life on it evolved together," Pilcher said.

More information

The American Museum of Natural History has more about oxygen.

-- Robert Preidt

SOURCE: Arizona State University, news release, Sept. 27, 2007

Copyright©2007 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Research unearths how caffeine prevents us from sleeping
2. Moon, the Best Place to Assess the Earths Climate Changes
3. Oxygen Usage During Exercise Could Indicate Heart Problems
4. The advantages of oxygen therapy
5. Oxygen Treatment may be injurious
6. Oxygen helps heal wounds
7. Oxygen Consumption During Workouts Could Indicate Heart Problems
8. Cooling Can Reduce The Risk Of Brain Damage In Oxygen Deprived Newborns
9. Air travel reduces oxygen level in the blood
10. Influence Of Heart Rate On Myocardial Oxygen Tension
11. Mobilizing Stem Cells at the Injured Site Using Hyperbaric Oxygen Treatments.
Post Your Comments:
(Date:12/1/2015)... Wilmington, Delaware (PRWEB) , ... December 01, 2015 ... ... award winner at the 7th Annual 2015 Golden Bridge Business Awards under the ... is a zero capex web based sample management software that ...
(Date:12/1/2015)... ... 01, 2015 , ... The importance of volumetric breast density ... of numerous abstracts accepted for presentation here, at the 101st Annual Radiology Society ... the use of Volpara Solutions’ quantitative breast imaging software tools for providing breast ...
(Date:12/1/2015)... CA (PRWEB) , ... December 01, 2015 , ... ... Health Center of Excellence (BHCOE) today announced that the organization has awarded Education ... San Francisco, with a Distinguished Award. The award celebrates exceptional special needs providers ...
(Date:12/1/2015)... ... December 01, 2015 , ... TCS ... care management and population health arenas, is pleased to announce that VIP Care ... services, has successfully implemented the ACUITY Complete Care™ Management to back their collaborative ...
(Date:12/1/2015)... ... December 01, 2015 , ... With FCPX Overlay: Grit , users can ... customization, the possibilities are truly endless, all with a click of a mouse. Each ... flip, horizontal flip, depth of field and more, all within Final Cut Pro X. ...
Breaking Medicine News(10 mins):
(Date:12/1/2015)... , December 1, 2015 ... market research report "Nucleic Acid Labeling Market by Product ... Translation, Random Primer, In Vitro Transcription, Reverse Transcription, End ... by MarketsandMarkets, The global market is expected to reach ... in 2015, growing at a CAGR of 8.65%. ...
(Date:12/1/2015)... 01, 2015 ... "Veterinary Equipment and Disposables Market by product, by ... to their offering. --> ) ... Equipment and Disposables Market by product, by Animal ... their offering. --> Research and Markets ...
(Date:12/1/2015)... 1, 2015  Today, AmerisourceBergen, a ... CareFront, a first-of-its-kind population health management program focused ... Designed to be built into existing employer benefit ... resources for their care and explains how to ... tools to help patients understand their treatment options ...
Breaking Medicine Technology: