About Careers Internship MedBlog Contact us
Medindia LOGIN REGISTER
Advertisement

Oxygen in Earth`s Atmosphere Was Present 8 Million Years Than Assumed

by Julia Samuel on February 17, 2016 at 6:50 PM
Font : A-A+

Oxygen in Earth`s Atmosphere Was Present 8 Million Years Than Assumed

Small levels of atmospheric oxygen were developed 3.8 billion years ago, some 7-8 million years earlier than thought, reports a new geological study based on data from Western Greenland.

Today, most researchers agree that the oxygenation of Earth's atmosphere happened in two major steps: the first during the so-called Great Oxidation Event about 2.5-2.4 billion years ago and the second during the Late Neoproterozoic Era around 750 to 540 million years ago. The latter is thought to have been the cause for the emergence of animals during the so-called Cambrian explosion around 540 to 520 million years ago.

Advertisement


Researchers led by Professor Robert Frei released a study indicating evidence for the presence of small concentrations of oxygen on Earth already 3.8 billion years ago. The researchers analysed Earth's oldest Banded Iron Formations (BIFs) from Western Greenland. BIFs are marine chemical sediments originally comprised of alternating layers of silica and Fe-hydroxides and are widely used as geochemical archives.

The reason for this is that they retain information on the composition and presence of oxygenation/reduction processes in ambient seawater and on the interaction of the atmosphere with Earth's surface.
Advertisement

The fact that the analyses of the BIF layers from Western Greenland show elements that require presence of oxygen in the atmosphere opens up for the possibility of evolution of the earliest primitive photosynthetic life forms as early as 3.8 billion years ago. The research is published in the Journal Scientific Reports.

Source: ANI
Advertisement

Advertisement
News A-Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
What's New on Medindia
Test Your Knowledge on Liver Transplantation
Organ Donation Week 2022 - 'Take the Pledge to Save Lives'
Test your Knowledge on Heart Transplantation
View all
News Archive
Date
Category
Advertisement
News Category

Medindia Newsletters Subscribe to our Free Newsletters!
Terms & Conditions and Privacy Policy.

Most Popular on Medindia

Blood Donation - Recipients Color Blindness Calculator How to Reduce School Bag Weight - Simple Tips Blood Pressure Calculator Noscaphene (Noscapine) Drug Interaction Checker Loram (2 mg) (Lorazepam) Pregnancy Confirmation Calculator Sinopril (2mg) (Lacidipine) Diaphragmatic Hernia
This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use