Global Geological And Climatic Events

Lonar Lake colour changes to pink


From UPSC perspective, the following things are important :

Prelims level : Lonar Crater Lake, Pleistoscene epoch

Mains level : NA

The colour of water in Maharashtra’s Lonar Lake, formed after a meteorite hit the Earth some 50,000 years ago, has changed to glaring.

Make a note of all saltwater lakes in India. Few of them are Pulicat, Pangong Tso, Chilika, and Sambhar Lakes etc.

About Lonar Lake

  • Lonar Lake, also known as Lonar crater, is a notified National Geo-heritage Monument, saline (pH of 10.5), Soda Lake, located at Lonar in Buldhana district, Maharashtra.
  • It was created by an asteroid collision with earth impact during the Pleistocene Epoch.
  • It is one of the four known, hyper-velocity, impact craters in basaltic rock anywhere on Earth.
  • It sits inside the Deccan Plateau—a massive plain of volcanic basalt rock created by eruptions some 65 million years ago.
  • Its location in this basalt field suggested to some geologists that it was a volcanic crater.

Why there’s a color change?

  • The salinity and algae can be responsible for this change.
  • There is no oxygen below one meter of the lake’s water surface.
  • There is an example of a lake in Iran, where water becomes reddish due to increase in salinity.
  • The level of water in the Lonar Lake is currently low as compared to the few past years and there is no rain to pour fresh water in it.
  • The low level of water may lead to increased salinity and change in the behaviour of algae because of atmospheric changes.
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