Navigation Links
Geologists revisit the Great Oxygenation Event
Date:8/19/2010

oxide and hydrogen sulfide.

The oceans that formed from condensing water vapor (or incoming comets) were reservoirs of dissolved iron, pumped through hydrothermal vents on the ocean floor.

Then about 2.7 billion years ago, cyanobacteria, which have been called the most self-sufficient organisms on the planet because they can both photosynthesize and fix nitrogen, began bubbling oxygen into the atmosphere and shallow waters.

At first oxygen built up gradually in the atmosphere, but about 2.5 billion years ago there was a sudden spike upward, traditionally called the Great Oxygenation Event.

The oxygen killed off anerobes that didn't find refuge in sediments, the deep ocean and other airless environments and led to the evolution of aerobes that could use oxygen to spark their metabolism.

At roughly the same time iron began to precipitate out of the oceans, forming rocks peculiar to this period called banded iron formations that consist of alternating layers of gray and red rock.

Banded iron formations were created episodically from about 3 billion years ago until 1.8 billion years ago and almost never again.

The usual story is that iron was being swept from the oceans by increasing levels of dissolved oxygen.

And then, another two billion years after the Great Oxygenation Event, multicellular lifeforms finally put in an appearance. The first metazoans, as they are called, were the bizarre Edicaran fauna, sometimes unflatteringly compared to sacks of mud and quilted mattresses.

The assumption was oxygen levels were now high enough to support something more than a single cell in lonely solitude.

Of course, this story has holes you could drive a truck through.

Why did oxygen levels spike 2.5 billion years ago, and how much oxygen was there in the atmosphere really? Why are banded iron formations made of layers only a few centimeters thick, and why did they stop forming so
'/>"/>

Contact: Diana Lutz
dlutz@wustl.edu
314-935-5272
Washington University in St. Louis
Source:Eurekalert  

Page: 1 2 3 4 5 6

Related biology news :

1. Brown geologists show unprecedented warming in Lake Tanganyika
2. Geologists studying groundwater arsenic levels in India empower Bengali women, children
3. University of Leicester geologists demonstrate extent of ancient ice age
4. Geologists map rocks to soak CO2 from air
5. 30 years later, what killed the dinosaurs is revisited
6. New research aims to unravel how phosphorus pollution drives toxic algal blooms in the Great Lakes
7. NOAA awards $2.5 million for research on invasive species in the Great Lakes
8. Children born after assisted reproduction at greater risk of congenital malformations
9. Fossil-fuel use and feeding world cause greatest environmental impacts: UNEP panel
10. The great pond experiment: Regional vs. local biodiversity
11. Small mammals -- and rest of food chain -- at greater risk from global warming than thought
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Geologists revisit the Great Oxygenation Event
(Date:7/10/2014)... NEW YORK , June 27, 2014 /PRNewswire/ ... against Provectus Biopharmaceuticals, Inc. ("Provectus" or the "Company")(NYSE-MKT: ... action, filed in United States District Court, Middle ... Division, is on behalf of a class consisting ... otherwise acquired Provectus securities between December 17, 2013 ...
(Date:7/10/2014)... SPRINGS, Florida , July 1, 2014 ... wallets pave way for convenience and improved security: NXT-ID, Inc. ... Inc. (NASDAQ: GOOG ), Apple Inc. (NASDAQ: ... and MasterCard Corporation (NYSE: MA) NXT-ID, Inc., (OTCQB: NXTD) ... is pleased to announce that the second series of 30 ...
(Date:7/10/2014)... July 2, 2014 It is a great ... the appointment of the world-renowned Thoracic and Cardiovascular surgeon, ... Dr. Ginsburg, with over 34 years of ... Hospital and Good Samaritan Regional Medical Center. Dr. Ginsburg ... late 1980,s and is considered an expert in the ...
Breaking Biology News(10 mins):SHAREHOLDER ALERT: Pomerantz Law Firm Announces the Filing of a Class Action against Provectus Biopharmaceuticals, Inc. and Certain Officers - PVCT 2SHAREHOLDER ALERT: Pomerantz Law Firm Announces the Filing of a Class Action against Provectus Biopharmaceuticals, Inc. and Certain Officers - PVCT 3Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 2Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 3Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 4Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 5Avery Biomedical Devices, Inc. announces the appointment of Mark E Ginsburg, M.D. to its Board of Directors 2
... able to change their spots, but corals can change their ... chemical composition of the seawater around them. , That's the ... writing in the July issue of the journal Geology. ... is the first known case of an animal altering the ...
... born infected with human cytomegalovirus, or CMV, and about ... the virus ?almost one an hour. These disabilities can ... of coordination, and seizures. According to the Centers for ... cause of serious disability as Down syndrome, fetal alcohol ...
... Biologists from Washington University in St. Louis and their ... trees of rice varieties and have determined that the ... Asian locales. , Jason Londo, Washington University in Arts ... A. Schaal, Ph.D., Washington University Spencer T. Olin Professor ...
Cached Biology News:Corals switch skeleton material as seawater changes 2Corals switch skeleton material as seawater changes 3Innovative method for creating a human cytomegalovirus vaccine outlined 2Biologists find regions of rice domestication 2
(Date:7/10/2014)... in the fight against terrorism with the creation of ... with the use of light and special glass fibres. ... B: Chemical , the researchers describe a novel optical ... low as 6.3 ppm (parts per million). It requires ... "Traditionally explosives detection has involved looking for metals that ...
(Date:7/10/2014)... of psychiatric disorders has been extremely challenging because there ... are insufficient to cause disease. Now investigators reporting in ... Cell Stem Cell describe a strategy that ... with other risk factors or environmental exposures to affect ... a genetic variant that may predispose individuals to schizophrenia. ...
(Date:7/10/2014)... spiders can sit upside down forever. Nanophysics makes sure of ... an article just published in Physical Review E . ... and spiders that seem to be able to sit still ... for many years. We will soon be able to buy ... gecko,s foot. But the fact is, sooner or later the ...
(Date:7/10/2014)... The new alliance will see the two universities and ... working with business and industry and their complementary academic ... will help to shape the scientific priorities of the ... train up to 300 high-calibre PhD students, will provide ... at NPL, the potential of the Laboratory will be ...
Breaking Biology Technology:Detecting trace amounts of explosives with light 2New strategy could uncover genes at the root of psychiatric illnesses 2Even geckos can lose their grip 2Universities of Surrey and Strathclyde selected as strategic partners in the future operation of the National Physical Laboratory 2Universities of Surrey and Strathclyde selected as strategic partners in the future operation of the National Physical Laboratory 3
... , MALVERN, Pa. ... (AMR) and Decision Resources find that the leading driver ... broad-spectrum activity against gram-positive and gram-negative pathogens. Due to ... surveyed European physicians reveal that they look primarily for ...
... ... Top LASIK surgeons and recognized refractive and cataract surgery ... up-to-date on the latest developments in vision correction surgery, cataract surgery, ... Ophthalmology (AAO) annual meeting in San Francisco, California. Dr. Richard Lindstrom, ...
... VIENNA, Austria, November 19 AFFiRiS AG ... an unexpectedly early,stage of development: the vaccine candidate AD02 is ... This decision by the company,immediately follows the completion of two ... based its fast decision on the first interim,analysis of the ...
Cached Biology Technology:Broad-Spectrum Antibacterial Activity is the Most Important Driver of Antibiotic Selection for Nosocomial Pneumonia In Europe 2Broad-Spectrum Antibacterial Activity is the Most Important Driver of Antibiotic Selection for Nosocomial Pneumonia In Europe 3Experts Listed at Trusted LASIK Surgeons Bring Peers Up to Date on Vision Correction and Cataract Surgery at Annual AAO Meeting 2Experts Listed at Trusted LASIK Surgeons Bring Peers Up to Date on Vision Correction and Cataract Surgery at Annual AAO Meeting 3Experts Listed at Trusted LASIK Surgeons Bring Peers Up to Date on Vision Correction and Cataract Surgery at Annual AAO Meeting 4Experts Listed at Trusted LASIK Surgeons Bring Peers Up to Date on Vision Correction and Cataract Surgery at Annual AAO Meeting 5Experts Listed at Trusted LASIK Surgeons Bring Peers Up to Date on Vision Correction and Cataract Surgery at Annual AAO Meeting 6Experts Listed at Trusted LASIK Surgeons Bring Peers Up to Date on Vision Correction and Cataract Surgery at Annual AAO Meeting 7Experts Listed at Trusted LASIK Surgeons Bring Peers Up to Date on Vision Correction and Cataract Surgery at Annual AAO Meeting 8Experts Listed at Trusted LASIK Surgeons Bring Peers Up to Date on Vision Correction and Cataract Surgery at Annual AAO Meeting 9AFFiRiS AG: Interim Analysis of Clinical Phase I Data Triggered Decision to Move Alzheimer's Vaccine Candidate AD02 into Clinical Phase II Testing 2AFFiRiS AG: Interim Analysis of Clinical Phase I Data Triggered Decision to Move Alzheimer's Vaccine Candidate AD02 into Clinical Phase II Testing 3