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:8/29/2014)... Davis have made some surprising discoveries about the ... immunodeficiency virus (SIV), the team found that specialized ... early responders to viral invasion and are the ... called interleukin-1 beta (IL-1β). , Though aimed ... of the gut epithelium that provides a barrier ...
(Date:8/29/2014)... ANTONIO (Aug. 29, 2014) Scientists at the Barshop ... School of Medicine at the UT Health Science Center ... in the tissues of the longest-lived rodent, the naked ... in the cells of naked mole rats protects and ... for damaged and obsolete proteins. , The factor also ...
(Date:8/29/2014)... known about what genetic changes transform wild animals into ... whom is a University of Montana assistant professor, has ... development of the brain and the nervous system were ... Aug. 28 in Science and gives answers ... http://www.sciencemag.org/ ., The domestication of animals and plants, a ...
Breaking Biology News(10 mins):The early cost of HIV 2Factor in naked mole rat's cells enhances protein integrity 2New research reveals how wild rabbits were genetically transformed into tame rabbits 2New research reveals how wild rabbits were genetically transformed into tame rabbits 3
... sequences obtained from a handful of patients with multiple sclerosis ... have revealed the existence of an "immune exchange" that allows ... brain. The cells in question, obtained from spinal fluid ... to clear foreign infections from the body but sometimes react ...
... TAMPA, Fla. (Nov. 19, 2012) In three studies published in ... of the National Academy of Inventors , innovators unveil creative ... of energy, and change our lives. Untapped energy in ... and in Florida,s ocean waves can be captured and used, said ...
... 2012) Columbia University Medical Center (CUMC) presented the ... and Diane Mathis, PhD, both of Harvard Medical School, ... mechanisms underlying type 1 diabetes over the past three ... Diabetes Center, is Columbia,s top honor for excellence in ...
Cached Biology News:Multiple sclerosis 'immune exchange' between brain and blood is uncovered 2New energy technologies promise brighter future 2New energy technologies promise brighter future 3Columbia awards 2012 Naomi Berrie Award to Drs. Christophe Benoist & Diane Mathis 2Columbia awards 2012 Naomi Berrie Award to Drs. Christophe Benoist & Diane Mathis 3
(Date:8/29/2014)... 2014  Pfenex Inc. (NYSE MKT: PFNX), a ... high-value and difficult to manufacture proteins including biosimilar ... financial results for the second quarter ended June ... of our initial public offering, we have the ... candidates, derived from our proprietary protein expression platform," ...
(Date:8/29/2014)... based on electrons, but one of the most promising ... circuits based on light (photons) instead of electrons. First, ... stream of single photons and control their direction. Researchers ... to achieve this control, but now scientists at the ... stream of photons emitted one at a time and ...
(Date:8/29/2014)... (PRWEB) August 29, 2014 The ... $5.6 billion in 2019. It is expected to ... to 2019, and was valued at $1.8 billion ... by Transparency Market Research. , For more information ... http://www.transparencymarketresearch.com/companion-diagnostics-market.html . , The research report, titled “Companion ...
(Date:8/29/2014)... According to a new market report published by Transparency ... valued at USD 3,754.6 million in 2012 and is estimated ... CAGR of 5.9% from 2013 to 2019. , Nearly half ... by bone and joint disorders, and this number is expected ... will continue to increase the demand for orthobiologics. Other factors ...
Breaking Biology Technology:Pfenex Reports Second Quarter 2014 Results and Provides Business Update 2Pfenex Reports Second Quarter 2014 Results and Provides Business Update 3Pfenex Reports Second Quarter 2014 Results and Provides Business Update 4Pfenex Reports Second Quarter 2014 Results and Provides Business Update 5Pfenex Reports Second Quarter 2014 Results and Provides Business Update 6Pfenex Reports Second Quarter 2014 Results and Provides Business Update 7Pfenex Reports Second Quarter 2014 Results and Provides Business Update 8Breakthrough in light sources for new quantum technology 2Companion Diagnostics Market to Hit $5.6 Billion in 2019: Transparency Market Research 2Companion Diagnostics Market to Hit $5.6 Billion in 2019: Transparency Market Research 3Global Orthobiologics Market to Reach $5,519.9 Million by 2019: Transparency Market Research 2Global Orthobiologics Market to Reach $5,519.9 Million by 2019: Transparency Market Research 3
... the University of Warwick have found that tiny nanoparticles ... interface of two non mixing liquids than previously ... for the uses of nanoparticles in living cells, polymer ... researchers are also working on ways of further artificially ...
... line of defense against toxins. A canary in a ... Scientists used fish to test for contaminants in our water. ... to detect a fatal chemical or organism. , Until ... Aviv University researchers have made an enormous -- and humane ...
... With,tomorrow,s release of the Forensics Study by the National ... has announced that: , -- ... media for comment,on the Forensics Study after it is ... 18th at 1:00 pm EST. A 37-year veteran ...
Cached Biology Technology:Nanoparticles double their chances of getting into sticky situations 2Tiny 'lab-on-a-chip' detects pollutants, disease and biological weapons 2CFSO Calls for Roundtable to Develop National Strategy for Advancing Forensic Sciences in the United States 2
... The Yeast Oligo Microarray Kit (V2), ... to simultaneously characterize expression of many ... gene activity during important biological processes. ... representing 6,256 known ORFs from the ...
... software offers an intuitive, easy-to-use ... control, diverse data handling, and ... Comprehensive functions include data acquisition, ... management in both standalone and ...
... This CLS number is a ... easily match Cornings product number. ... please order under the old ... customer service for assistance. ID ...
... is a new product number, ... product number. If showing no ... the old Sigma-Aldrich number (Z71,350-3) ... assistance. ID clarifier: rack holds ...
Biology Products: