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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


Competition Commission of India (CCI)

Competition Commission of India has selected Ansuman Pattnaik as the new head of its investigation’s unit recently. The Competition Commission of India (CCI) is a statutory body within the Ministry of Corporate Affairs. It was established in 2003, but became fully functional in 2009. The CCI aims to establish a

Connected Lending (CL)

RBI’s move to consolidate the scattered laws on connected lending is welcome. CL refers to persons who are in the position to control the decision of the lender. CL is the extension of credit to individuals or firms connected through ownership or the ability to exert control, whether direct or indirect. CL refers to cases where the

Cosmic Distances

No human probe has travelled much beyond the Solar System, yet we are able to measure distances across billions of light-years. The space beyond Earth is so incredibly vast that units of measure, which are convenient in everyday lives, can become gigantic. Distances between the planets, and especially between the stars, become so big when e

Devil Comet

Mount Everest-sized Devil comet hurtling in Earth’s direction could explode today. Pons-Brooks Comet - Comet 13P/Pons-Brooks, also called the Devil Comet, is about the size of Mount Everest and it is hurtling towards Earth. After an outburst in July, scientists believe that the comet could explode once again today. Ice volcanoe

Kakad Bhairav or Bhilat Baba BHILS

A stone deity worshipped by the Bhils in Madhya Pradesh’s Bagh was recently proved to be a fossilized dinosaur egg. Just like their ancestors worshipped ancient stones as deities, generations of Bhils had worshipped this sunbaked, reddish-brown Kakad Bhairav or Bhilat Baba. Sacrifices of chickens and sheep marked their whispered pleas

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01 Feb,2024

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