UPSC Courses

DNA banner


  • 05 July, 2020

  • 3 Min Read

Great Oxidation Event (GOE)

Great Oxidation Event (GOE)

  • The Great Oxidation Event (GOE), sometimes also called the Great Oxygenation Event, Oxygen Catastrophe, Oxygen Crisis, Oxygen Holocaust, or Oxygen Revolution, was a time period when the Earth's atmosphere and the shallow ocean experienced a rise in oxygen, approximately 2.4 billion years ago (2.4 Ga) to 2.1–2.0 Ga during the Paleoproterozoic era.
  • Geological, isotopic, and chemical evidence suggests that biologically produced molecular oxygen (dioxygen, O2) started to accumulate in Earth's atmosphere and changed Earth's atmosphere from a weakly reducing atmosphere to an oxidizing atmosphere, causing many existing species on Earth to die out.
  • The cyanobacteria producing the oxygen caused the event which enabled the subsequent development of multicellular forms.

Source: TH

  • 14 June, 2020

  • 5 Min Read

Great Oxidation Event (GOE)

Great Oxidation Event (GOE)

  • The atmosphere of early Earth contained little molecular oxygen. A significant increase in oxygen occurred ca. 2.4–2.0 billion years ago in what is called the Great Oxidation Event (GOE).
  • A large positive excursion in carbon isotopic composition in sedimentary carbonates is known to have occurred 2.2–2.0 billion years ago (the Lomagundi-Jatuli event), which provides evidence for an enhanced rate of organic carbon burial, i.e., enhanced net production of oxygen.
  • The Proterozoic snowball Earth event (global glaciation) occurred 2.3–2.2 billion years ago, roughly coinciding with the GOE.
  • Thus, a causal relationship between the GOE and the snowball Earth event has been suggested.
  • The snowball Earth event could have been triggered by an increase in oxygen in the atmosphere because it would have resulted in a significant reduction of atmospheric methane level, thereby reducing the greenhouse effect of the atmosphere and causing global glaciation.
  • On the other hand, the termination of the snowball Earth event may have triggered the production of a large amount of oxygen because the extremely hot climate (~60 °C) immediately after the termination of the snowball Earth event must have significantly increased the supply of phosphate to the oceans, resulting in large-scale blooms of cyanobacteria, which could have produced large amounts of oxygen.
  • The postglacial transition of atmospheric oxygen levels may have promoted an ecological shift and biological innovations for oxygen-dependent life.

Source: TH

Draft Indian Nutrition Rating (INR)

Draft Indian Nutrition Rating (INR) The country's top food regulator, the Food Safety and Standards Authority of India (FSSAI), has published a draft regulation for front-of-pack labeling. Major Points This draft notification addresses front-of-pack labelling in an effort to deter customers from purchasing packaged foods that are h

Social Audit of Social Sector Scheme

Social Audit of Social Sector Scheme The Rajasthan government has made the first-ever decision in the nation to create a specialized social and performance audit authority to undertake social audits of initiatives. What does this decision mean, exactly? Make public accountability a priority: In addition to conducting performance

Dharamshala Declaration 2022

Dharamshala Declaration 2022 & Tourism In India A recent three-day national tourist conference saw the introduction of the "Dharamshala Declaration 2022." Details about the news In the National Conference, the Center announced a comprehensive plan for the tourism industry. By 2024, tourism will have returned to its p

National Assessment & Accreditation Council (NAAC)

National Assessment & Accreditation Council (NAAC) & Higher Education The Maharaja Sayajirao University of Baroda's National Assessment and Accreditation Council (NAAC) ratings recently sparked controversy since the institution's grade increased from A to A+ as a result of improvements across all areas. What is India's

Ethereum Merger

Ethereum Merger The second-most valued cryptocurrency in the world, Ethereum, just underwent a substantial software upgrade. About: Ethereum redesign: This process is referred to as "The Merge." It will do away with the requirement for cryptocurrency miners and massive mining farms, which previously powered the blockchai


Search By Date

Newsletter Subscription
SMS Alerts