Oxygen `2.48 billion years old`
Washington: Oxygen is likely to be 2.48 billion years old, a new research has suggested.
An international team says that banded ironstone core samples from the Pilbara rocks in Australia have aided in dating the first appearance of atmospheric oxygen at 2.48
billion years ago.
Prof Mark Barley, who led the team, says their findings, published in the `Nature` journal. rested on the reliability of the rock samples they used as evidence.
According to geologists, the Great Oxidation Event, when earth`s atmospheric oxygen formed, happened at between 2.48 and 2.32 billion years ago.
"This was evidence for the most primitive form of aerobic respiring life, aerobic respiring bacteria which oxidize pyrite that released acid that dissolved rocks and soils on land, including chromium, that was then carried to the oceans by the flow of water.
"The aerobic respiring chemolitho-autorobic bacteria require coexistence with cyanobacteria producing oxygen to do this," Prof Barley said.
Prof Barley says that geobiologists are working towards a better database, for more evidence of when the types of bacteria linked to the rise of oxygen were really functioning.
"We got a good group of samples from banded iron formations and analysed the chromium isotopes and other elements because that gives the strongest evidence of
"If you have a good deep drill hole that`s not close to a big iron ore deposit, you have got the appropriate chemistry record," he said.
More from India
More from World
More from Sports
More from Entertaiment
- Security guard beats woman journalist publicly in Pakistan
- Pakistan violates ceasefire in J&K's Hiranagar; 7 Pak Rangers killed, BSF jawan injured
- ISIS terrorists escape Mosul disguised in women's clothing
- DNA: Analysing the existing poor condition of Indian education system
- DNA: Pakistan violates ceasefire in J&K's Hiranagar; Seven Pak Rangers killed
- Navjot Singh Sidhu out on zero to Waqar Younis in 1990 – The match Kapil Sharma keeps talking about
- MS Dhoni reacts in astonishment as Axar Patel takes a stunning one-handed catch - VIDEO
- BSP shrugs off Rita Bahuguna 's jump; says BJP will still face defeat in UP polls
- MS Dhoni or Virat Kohli? Here's Virender Sehwag's best ever reply
- Sushant Singh Rajput’s former girlfriend Ankita Lokhande’s Karva Chauth photos will surprise you