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:6/24/2016)... Marne, Michigan (PRWEB) , ... June 24, 2016 , ... ... To deal with these feelings, many turn to unhealthy avenues, such as drug or ... Center of Marne, Michigan, has released tools for healthy coping following a traumatic event. ...
(Date:6/24/2016)... Texas (PRWEB) , ... June 24, 2016 , ... ... International Conference and Scientific Sessions in Dallas that it will receive two significant ... of the grants came as PHA marked its 25th anniversary by recognizing patients, ...
(Date:6/24/2016)... Diego, CA (PRWEB) , ... June 24, 2016 , ... ... with the American Cancer Society and the Road To Recovery® program to drive cancer ... to seniors and other adults to ensure the highest quality of life and ongoing ...
(Date:6/24/2016)... ... June 24, 2016 , ... ... Clinical Decision Making in Emergency Medicine conference in Ponte Vedra Beach, FL. The ... published in Emergency Medicine Practice and Pediatric Emergency Medicine Practice. , ...
(Date:6/24/2016)... ... June 24, 2016 , ... ... feeding the Frederick area economy by obtaining investment capital for emerging technology companies. ... 2½ years that have already resulted in more than a million dollars of ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... June 23, 2016 , , ... July 7, 2016 , , , , LOCATION: , , ... , , , EXPERT PANELISTS:  , , , Frost & ... Analyst, Christi Bird; Senior Industry Analyst, Divyaa Ravishankar and Unmesh Lal, ... The global pharmaceutical industry is witnessing an exceptional era. Several new ...
(Date:6/23/2016)... , June 23, 2016  Guerbet announced today that ... Supplier Horizon Award . One of ... was recognized for its support of Premier members through ... clinical excellence, and commitment to lower costs. ... this recognition of our outstanding customer service from Premier," ...
(Date:6/23/2016)... -- The Biotechnology industry might still be ... opportunities to investors. assesses the recent performances of ... XON ), Vertex Pharmaceuticals Inc. (NASDAQ: ... ), and Regeneron Pharmaceuticals Inc. (NASDAQ: REGN ... complimentary trade alerts at: ...
Breaking Medicine Technology: