Navigation Links
Deep-sea rocks point to early oxygen on Earth
Date:3/24/2009

Red jasper cored from layers 3.46 billion years old suggests that not only did the oceans contain abundant oxygen then, but that the atmosphere was as oxygen rich as it is today, according to geologists.

This jasper or hematite-rich chert formed in ways similar to the way this rock forms around hydrothermal vents in the deep oceans today.

"Many people have assumed that the hematite in ancient rocks formed by the oxidation of siderite in the modern atmosphere," said Hiroshi Ohmoto, professor of geochemistry, Penn State. "That is why we wanted to drill deeper, below the water table and recover unweathered rocks."

The researchers drilled diagonally into the base of a hill in the Pilbara Craton in northwest Western Australia to obtain samples of jasper that could not have been exposed to the atmosphere or water. These jaspers could be dated to 3.46 billion years ago.

"Everyone agrees that this jasper is 3.46 billion years old," said Ohmoto. "If hematite were formed by the oxidation of siderite at any time, the hematite would be found on the outside of the siderite, but it is found inside," he reported in a recent issue of Nature Geoscience.

The next step was to determine if the hematite formed near the water's surface or in the depths. Iron compounds exposed to ultra violet light can form ferric hydroxide, which can sink to the bottom as tiny particles and then converted to hematite at temperatures of at least 140 degrees Fahrenheit.

"There are a number of cases around the world where hematite is formed in this way," says Ohmoto. "So just because there is hematite, there is not necessarily oxygen in the water or the atmosphere."

The key to determining if ultra violet light or oxygen formed the hematite is the crystalline structure of the hematite itself. If the precursors of hematite were formed at the surface, the crystalline structure of the rock would have formed from small particles aggregat
'/>"/>

Contact: A'ndrea Elyse Messer
aem1@psu.edu
814-865-9481
Penn State
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Scientists launch deep-sea scientific drilling program to study volatile earthquake zone
2. Deep-sea species loss could lead to oceans collapse, study suggests
3. Deep-sea sharks wired for sound
4. Persistent man-made chemical pollutants found in deep-sea octopods and squids
5. Women in Science fellowship to fund postdocs study of deep-sea methane
6. Researchers study acoustic communication in deep-sea fish
7. New deep-sea observatory goes live
8. New deep-sea coral discovered on NOAA-supported mission
9. Elephant shark genome sequence leads to discovery of color perception in deep-sea fish
10. New deep-sea coral discovered on NOAA-supported mission
11. Hot springs microbes hold key to dating sedimentary rocks, researchers say
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Deep-sea rocks point to early oxygen on Earth
(Date:9/23/2014)... Pattern formation is essential in the development of animals ... how can genetic information be translated in a reliable ... , The French-flag model of stripe formation is ... by the different colours of the French flag, is ... i.e. at high, middle or low concentrations of the ...
(Date:9/23/2014)... 23 de septiembre de 2014 ... 1290 Infinity II LC, el nuevo instrumento ... su portafolio de cromatografía líquida. El sistema ... de laboratorio que alcancen nuevos niveles de ... uso y capacidad de integración de laboratorio. ...
(Date:9/22/2014)... Researchers at the University of Chicago have shown that ... (ICU) only a handful of pathogenic microbe species remain ... pathogens and discovered that some can become deadly when ... to illness. , The findings, published in mBio ... for Microbiology, may lead to better monitoring and treatment ...
Breaking Biology News(10 mins):Recreating the stripe patterns found in animals by engineering synthetic gene networks 2Agilent Technologies anuncia el lanzamiento del Sistema 1290 Infinity II LC 2Agilent Technologies anuncia el lanzamiento del Sistema 1290 Infinity II LC 3Critically ill ICU patients lose almost all of their gut microbesand the ones left aren't good 2Critically ill ICU patients lose almost all of their gut microbesand the ones left aren't good 3
... found that infants who were fed formula enriched with ... months scored significantly better than a control group on ... three to six years. Specifically, the children ... rule-learning and inhibition between the ages of three to ...
... increased the number of fruits and vegetables eaten and ... children had two secret weapons, according to a University ... and other relatives involved because family togetherness is a ... school, target only the child, but we know that ...
... University of Colorado Cancer Center member recently published in ... that in young, female cancer survivors, quality of life ... 59 cancer survivors to 66 healthy controls and found ... anxiety than the general population. Of note, survivors reported ...
Cached Biology News:DHA-enriched formula in infancy linked to positive cognitive outcomes in childhood 2Latino families in study eat more fruits and veggies, drink less soda 2Latino families in study eat more fruits and veggies, drink less soda 3Perception of fertility affects quality of life in young, female cancer survivors 2
(Date:9/22/2014)... 22, 2014 Patients who were treated with a statin ... were significantly more likely to survive than those who ... JAMA Neurology . This study was conducted by ... of cholesterol-lowering statins can improve survival in victims of ... or obstruction of a blood vessel that blocks blood ...
(Date:9/22/2014)... researchers at the USC Viterbi School of Engineering, ... microfluidic system quickly and cheaply by simply snapping ... systems are used in many fields including engineering, ... of fluids for use in applications such as ... testing, and synthetic chemistry. Traditionally, microfluidic devices are ...
(Date:9/22/2014)... Minnesota electrical engineering researchers have developed a unique ... mechanical transportation of light. The discovery could have ... optical devices for computation and communication. , The ... computer engineering assistant professor Mo Li and his ... and will appear in the October issue of ...
(Date:9/22/2014)... 22, 2014 US demand to rise 3.9% ... biocides is forecast to rise 3.9 percent per year ... is projected to increase 1.3 percent per year to ... rebound in construction expenditures will support demand for biocides ... while growth in consumer spending and manufacturing output will ...
Breaking Biology Technology:Statin use during hospitalization for hemorrhagic stroke associated with improved survival 2Lego-like modular components make building 3-D 'labs-on-a-chip' a snap 2Lego-like modular components make building 3-D 'labs-on-a-chip' a snap 3Lego-like modular components make building 3-D 'labs-on-a-chip' a snap 4Lego-like modular components make building 3-D 'labs-on-a-chip' a snap 5Engineers show light can play seesaw at the nanoscale 2US Biocides Market 2US Biocides Market 3
... freeze budget proposal? Legislative Republicans voted for it because they ... convinced the freeze was good policy and secretly hoped Doyle ... Democrats and Gov. Jim Doyles proposal to raise the state ... vote for such a populist bill if it reaches the ...
... , ,* * * * * * * * * ... DEMOmobile 2003, and the experience has only strengthened our belief that ... The energy from the 400-plus attendees and 37 demonstrating companies was ... connectivity -- both in our homes and our businesses -- has ...
... - Representatives of the Medical College of Wisconsin, UW-Medical ... on a Milwaukee business television show, Avante's Leaders in ... on WISN. , ,Dr. Jeffrey Smith, clinical assistant professor ... School was joined by Mike Klein, founder and ...
Cached Biology Technology:Doyle and the Legislature Have Much To Agree Upon When It Comes To The Economy 2Doyle and the Legislature Have Much To Agree Upon When It Comes To The Economy 3The News From DEMOmobile 2003 2The News From DEMOmobile 2003 3The Information Age of Healthcare - Leaders featured on local new economy show 2The Information Age of Healthcare - Leaders featured on local new economy show 3
Anti-gp120/160(SIV/mac239) Immunogen: gp120(SIV/mac239) protein (Genebank accession #M33262)...
Annexin V Binding Buffer, 10X Concentrate Buffer , 50 ml Consult technical datasheet for details....
IHC Select Anti-p53, prediluted,wild & mutant, a.a. 19-26, clone DO-7 Immunogen: Human p53 Available Date: 37775...
Feline Rhinotracheitis Virus...
Biology Products: