Navigation Links
Path to oxygen in Earth's atmosphere: long series of starts and stops
Date:12/6/2011

The appearance of oxygen in the Earth's atmosphere probably did not occur as a single event, but as a long series of starts and stops, according to geoscientists who investigated rock cores from the FAR DEEP project.

The Fennoscandia Arctic Russia - Drilling Early Earth Project--FAR DEEP--took place during the summer of 2007 near Murmansk in Northwest Russia.

The project, part of the International Continental Scientific Drilling Program, drilled a series of shallow, two-inch diameter cores and, by overlapping them, created a record of stone deposited during the Proterozoic Eon--2,500 million to 542 million years ago.

"We've always thought that oxygen came into the atmosphere really quickly during an event," said Lee Kump, a geoscientist at Penn State University.

"We are no longer looking for an event. Now we're looking for when and why oxygen became a stable part of the Earth's atmosphere."

The researchers report in this week's issue of the journal Science Express that evaluation of these cores, in comparison with cores from Gabon previously analyzed by others, supports the conclusion that the Great Oxidation Event, the appearance of free oxygen in Earth's atmosphere, played out over hundreds of millions of years. Kump is the lead author of the Science Express paper.

Oxygen levels gradually crossed the low atmospheric oxygen threshold for pyrite--an iron sulfur mineral--oxidation by 2,500 million years ago, and the loss of what scientists call mass-independently fractionated (MIF) sulfur by 2,400 million years ago.

Then oxygen levels rose at an ever-increasing rate through the Paleoproterozoic, achieving about one percent of the present atmospheric level.

"The definition of when an oxygen atmosphere occurred depends on which threshold you are looking for," said Kump. "It could be when pyrite becomes oxidized, when sulfur MIF disappears, or when deep crustal oxi
'/>"/>

Contact: Cheryl Dybas
cdybas@nsf.gov
703-292-7734
National Science Foundation
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. How plants sense low oxygen levels to survive flooding
2. New evidence for the oldest oxygen-breathing life on land
3. Discovery suggests way to block fetal brain damage produced by oxygen deprivation
4. MIT: Oxygens watery past
5. Climate change could turn oxygen-free seas from blessing to curse for zooplankton
6. Oceans harmful low-oxygen zones growing, are sensitive to small changes in climate
7. Johns Hopkins researchers link cell division and oxygen levels
8. Beneficial bacteria help repair intestinal injury by inducing reactive oxygen species
9. Oxygenation at a depth of 120 meters can save the Baltic Sea
10. Oxygen sensor invention could benefit fisheries to breweries
11. High dose of oxygen enhances natural cancer treatment
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Path to oxygen in Earth's atmosphere: long series of starts and stops
(Date:9/30/2014)... of Health (NIH) awarded Lawrence Livermore National Laboratory ... array system that will enable researchers to better ... and scale. , LLNL,s grant-funded project is part ... BRAIN (Brain Research through Advancing Innovative Neurotechnologies) Initiative ... understanding of the human mind and uncover ways ...
(Date:9/30/2014)... of environmental scientists and engineers, led by Clemson ... three-year, $5.25 million grant from the U.S. Department ... to make a direct positive impact on South ... disposal of radioactive contaminants. , "Understanding the scientific ... with environmental aspects of nuclear technologies is imperative ...
(Date:9/30/2014)... Medicine reports positive results of a phase 1 ... of lung cancer marked by rearrangement of the gene ... advanced non-small cell lung cancer testing positive for ROS1 ... 3 complete responses and 33 partial responses. Median progression-free ... to resume its growth after being slowed by treatment ...
Breaking Biology News(10 mins):NIH taps lab to develop sophisticated electrode array system to monitor brain act 2NIH taps lab to develop sophisticated electrode array system to monitor brain act 3Researchers get $5.25 million to advance nuclear technologies in South Carolina 2NEJM: Crizotinib effective in Phase 1 trial against ROS1 lung cancer 2
... little research has been done on it, now may have ... involving people, the acai (ah-sigh-EE) berry has proven its ability ... as juice and pulp. That finding, by a team of ... of the Journal of Agricultural and Food Chemistry ., ...
... a chance to take root and spread, scientists are ... prevention. Leading experts from around the globe are gathering ... promising new field, with the hope this work will ... you take advantage of the meeting,s scientific abstracts and ...
... al.report in the Journal of Cell Biology ... movement in tumor cells., On 2D surfaces, cells may ... the cell to the extracellular matrix, are known to ... been unclear. Recent work has suggested that an integrin ...
Cached Biology News:Research shows Brazilian acai berry antioxidants absorbed by human body 2Research shows Brazilian acai berry antioxidants absorbed by human body 3
(Date:9/30/2014)... , Sept. 30, 2014 Pacific Northwest ... Summary Global Markets Direct,s, ,Pacific Northwest ... provides an overview of the Pacific Northwest Biotechnology, ... report provides comprehensive information on the current therapeutic ... with comparative analysis at various stages, therapeutics assessment ...
(Date:9/30/2014)... Over the last decade, the laboratory ... R&D budgets and increased acceptance of new filtration technologies ... biotechnology industries are also catalyzing the growth of laboratory ... expected to grow at a strong CAGR during the ... worth $2,532.6 million by 2019. The market is mainly ...
(Date:9/30/2014)... -- CORD:USE Cord Blood Bank – www.corduse.com ... into an Equity and Exclusive Services Agreement with Tianhe Stem ... patented technologies for the isolation of human cord blood-derived ... performing Phase I/II clinical trials in China ... Tianhe,s Stem Cell Educator Therapy showing that the therapy ...
(Date:9/30/2014)... Iowa , Sept. 30, 2014  KemPharm, ... the discovery and development of proprietary new molecular ... States Patent and Trademark Office (USPTO) issued U.S. ... application entitled, "Benzoic Acid, Benzoic Acid Derivatives and ... of Making and Use Thereof." The ...
Breaking Biology Technology:Pacific Northwest Biotechnology, LLC - Product Pipeline Review - 2014 2Pacific Northwest Biotechnology, LLC - Product Pipeline Review - 2014 3Global Laboratory Filtration Market To See 7.0% CAGR to 2019 Says a Research Report Available at ReportsnReports.com 2Global Laboratory Filtration Market To See 7.0% CAGR to 2019 Says a Research Report Available at ReportsnReports.com 3Global Laboratory Filtration Market To See 7.0% CAGR to 2019 Says a Research Report Available at ReportsnReports.com 4Global Laboratory Filtration Market To See 7.0% CAGR to 2019 Says a Research Report Available at ReportsnReports.com 5CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 2CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 3CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 4KemPharm, Inc. Receives Patent from the USPTO for Novel Prodrug of Hydromorphone, KP511 2
... Seamless Performance Between GeneChip Scanner 3000 ... , ... GeneChip Instrument System is the most advanced microarray analysis platform ... array manufacturing processes have enabled Affymetrix to produce expression probe arrays with ...
... Spectrometry Application Note , Melissa ... Introduction , ... complex mixtures is one of the key objectives for the use of ... ion trap systems, such as the Finnigan LCQ Deca XP Plus and ...
... Chromatography and Mass Spectrometry Application Note , ... Quantum Discovery Enhanced Mass- Resolution , Xiaoying ... Walter Korfmacher 1 , ... NJ, USA; 2 Thermo Electron Corporation, Somerset, NJ, USA , ...
Cached Biology Technology:The New Affymetrix GeneChip Scanner 3000 2The New Affymetrix GeneChip Scanner 3000 3The New Affymetrix GeneChip Scanner 3000 4The New Affymetrix GeneChip Scanner 3000 5The New Affymetrix GeneChip Scanner 3000 6The New Affymetrix GeneChip Scanner 3000 7The New Affymetrix GeneChip Scanner 3000 8The New Affymetrix GeneChip Scanner 3000 9The New Affymetrix GeneChip Scanner 3000 10The New Affymetrix GeneChip Scanner 3000 11The New Affymetrix GeneChip Scanner 3000 12The New Affymetrix GeneChip Scanner 3000 13The New Affymetrix GeneChip Scanner 3000 14The New Affymetrix GeneChip Scanner 3000 15Complex Peptide Mixture Analysis on the Finnigan LTQ Linear Ion Trap Mass Spectrometer 2Complex Peptide Mixture Analysis on the Finnigan LTQ Linear Ion Trap Mass Spectrometer 3Complex Peptide Mixture Analysis on the Finnigan LTQ Linear Ion Trap Mass Spectrometer 4Increased Analyte Sensitivity through the Utility of Enhanced Mass-Resolution on the FinniganTSQ Quantum Discovery 2Increased Analyte Sensitivity through the Utility of Enhanced Mass-Resolution on the FinniganTSQ Quantum Discovery 3Increased Analyte Sensitivity through the Utility of Enhanced Mass-Resolution on the FinniganTSQ Quantum Discovery 4Increased Analyte Sensitivity through the Utility of Enhanced Mass-Resolution on the FinniganTSQ Quantum Discovery 5Increased Analyte Sensitivity through the Utility of Enhanced Mass-Resolution on the FinniganTSQ Quantum Discovery 6