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DAILY NEWS ANALYSIS

  • 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


India–Azerbaijan

A year after tensions arising from Operation Sindoor, India and Azerbaijan have taken steps to restore and normalise bilateral relations. The 6th round of Foreign Office Consultations, held in Baku, marked the first such engagement since 2022, signaling renewed diplomatic momentum. Recent Diplomatic Engagement During the consultations, bo

India–Australia Economic Cooperation and Trade Agreem

The India–Australia Economic Cooperation and Trade Agreement has completed four years since its signing. Both countries now aim to build on this progress through strengthened collaboration and ambitious targets, including reaching AUD 100 billion in bilateral trade by 2030. What is the India–Australia Economic Cooperation and Tra

ADR Report on Political Funding

A recent report by the Association for Democratic Reforms (ADR) analyses donations of ?20,000 or more declared to the Election Commission of India (ECI) by national political parties for FY 2024–25, highlighting transparency and accountability in political financing. Key Findings Massive Funding Surge Total donations to nationa

Maritime Chokepoints

Maritime chokepoints are narrow channels along global shipping routes where maritime traffic is concentrated. These points are geopolitically and economically critical, as they handle a large proportion of global trade, especially energy shipments. Current Relevance Over two-thirds of seaborne energy trade passes through a handful o

US-Israel-Iran War

Following the launch of Operation Epic Fury (U.S.) and Operation Roaring Lion (Israel), the geopolitical landscape has shifted fundamentally with the confirmed death of Iran’s Supreme Leader, Ayatollah Ali Khamenei.Iran retaliated through Operation True Promise 4, launching missile attacks against Israel and nearby Gulf states. The escala

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05 Apr,2026

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