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:7/30/2014)... treatment has been shown to relieve patients, pain. ... transmission between the peripheral and central nervous systems, ... Radiation Medicine, Chinese Academy of Medical Sciences, China ... dorsal root ganglia (DRG) to provide relief for ... 14.8, 29.6 MBq) were implanted separately into the ...
(Date:7/30/2014)... cells types. Researchers would like to understand how to channel ... make up the organs and other structures of living organisms. ... sugars that dangle from proteins on surfaces of cells. , ... has created synthetic molecules that can stand in for the ... the process, they report in the Journal of the ...
(Date:7/30/2014)... 2014 The Nano-Bio Manufacturing Consortium (NBMC), ... Force Research Laboratory (AFRL), has awarded funding for ... University to develop electronics and biometric sensor ... project, with contributions from the University of California, ... ( Endicott, N.Y. ), is scheduled ...
Breaking Biology News(10 mins):Nano-Bio Manufacturing Consortium Awards Funding to Binghamton University for Development of Electronics and Biometric Sensor Platforms 2Nano-Bio Manufacturing Consortium Awards Funding to Binghamton University for Development of Electronics and Biometric Sensor Platforms 3
... University of Colorado Boulder researchers who have adapted a ... time some 2.8 billion years ago when the sun ... have been more prone to catastrophic glaciation than previously ... Eon on Earth that lasted from about 3.8 billion ...
... HEIDELBERG -- EMBO today announces the selection of seven ... The grants will assist the researchers to relocate and ... and Turkey. "The EMBO Installation Grants directly support ... said Gerlind Wallon, Installation Grants Programme Manager and EMBO ...
... In pets and people, the time it takes to diagnose ... of Missouri veterinarian is identifying ways to diagnose pet infections ... resulting test could be used eventually for humans. "Infections ... send samples to a lab and wait three days or ...
Cached Biology News:Early Earth may have been prone to deep freezes, says CU-Boulder study 2Early Earth may have been prone to deep freezes, says CU-Boulder study 3
(Date:7/30/2014)...  The Chicago Bears are excited to announce the ... in an effort to raise awareness of skin cancer. ... SPOT me™ skin cancer screenings at a preseason fan ... SPOT me™ is an educational campaign designed to inform ... of skin cancer, and encourages people to get screened ...
(Date:7/30/2014)... July 30, 2014 Sales Horizons, a ... of blended sales training programs for companies engaged in ... programs used by thousands of salespeople over 25 years ... training program can be customized to address the unique ... blended sales training program consists of two ...
(Date:7/30/2014)... (PRWEB) July 30, 2014 BCC Research ... Global Markets for Enzymes in Industrial Applications , the ... to nearly $7.1 billion by 2018, registering a five-year ... is estimated to be recorded in the detergent enzyme ... period. , Enzyme technology has influenced almost every sector ...
(Date:7/30/2014)... Fla. , July 30, 2014  Dyadic ... biotechnology company whose patented and proprietary technologies are ... and other proteins for the bioenergy, bio-based chemical, ... appointment of Thomas "Tom" Dubinski as Vice President ... for leading the financial and information technology operations ...
Breaking Biology Technology:Chicago Bears Join the American Academy of Dermatology in Fight against Skin Cancer 2Chicago Bears Join the American Academy of Dermatology in Fight against Skin Cancer 3Chicago Bears Join the American Academy of Dermatology in Fight against Skin Cancer 4Sales Horizons Launches New Blended Sales Training Programs to Companies Engaged in Complex B2B Sales 2Sales Horizons Launches New Blended Sales Training Programs to Companies Engaged in Complex B2B Sales 3Global Market for Industrial Enzymes to Reach Nearly $7.1 Billion by 2018; Detergent Enzyme Market to Record Maximum Growth 2Global Market for Industrial Enzymes to Reach Nearly $7.1 Billion by 2018; Detergent Enzyme Market to Record Maximum Growth 3Thomas Dubinski joins Dyadic as Chief Financial Officer 2Thomas Dubinski joins Dyadic as Chief Financial Officer 3Thomas Dubinski joins Dyadic as Chief Financial Officer 4
... June 3 Experts from PAREXEL International Corporation (Nasdaq: ... provider, will address important industry issues at the Drug ... June 21 - 25, 2009 in San Diego, California. ... topics ranging from global development strategies, clinical logistics in ...
... ... Adventus EHC ® Enhanced Natural Attenuation Biotechnology as Demonstrably Superior to Alternatives ... New York, NY ... enterprise for treatment of contaminated soil, sediment and groundwater environments, is proud to announce ...
... from their roots up to their leaves hundreds of feet ... the University of Rochester have created a simple slab of ... at a speed that would make nature envious. , The ... Letters , may prove invaluable in pumping microscopic amounts of ...
Cached Biology Technology:PAREXEL Experts to Present Leading Insights at Drug Information Association 45th Annual Meeting 2PAREXEL Experts to Present Leading Insights at Drug Information Association 45th Annual Meeting 3PAREXEL Experts to Present Leading Insights at Drug Information Association 45th Annual Meeting 4PAREXEL Experts to Present Leading Insights at Drug Information Association 45th Annual Meeting 5PAREXEL Experts to Present Leading Insights at Drug Information Association 45th Annual Meeting 6Successful Field-Trial Remediation of 1,2-DCA and VC Contaminated Groundwater in Northern Italy 2Successful Field-Trial Remediation of 1,2-DCA and VC Contaminated Groundwater in Northern Italy 3Successful Field-Trial Remediation of 1,2-DCA and VC Contaminated Groundwater in Northern Italy 4Scientists create metal that pumps liquid uphill 2Scientists create metal that pumps liquid uphill 3
...
Sterile detoxified 10% bovine serum albumin (BSA) in Iscoves MDM. This BSA has been selected to support the optimal colony growth of human hematopoietic progenitor cells in methylcellulose-based medi...
... full-featured high-performance ICP-MS system designed for flexibility ... Omega II off-axis ion lens, true hyperbolic ... can handle the widest range of sample ... 7500a now includes as standard Agilents unique ...
... DH-2000, except that it uses a deep-UV deuterium ... and comes with a shutter (controlled via a ... The DH-2000 Deuterium Tungsten Halogen Light ... tungsten halogen light sources in a single optical ...
Biology Products: