Lonar Lake is a unique saline soda lake located in the Buldhana district of Maharashtra, India. It’s globally significant because it was formed by a high-velocity meteorite impact, making it one of the very few hyper-velocity impact craters in basaltic rock.
There are many other such lakes/craters made due to meteorite impacts but none like this
Almost a mile in diameter
When I tried with measurement tool it appears somewhere around ~1.6km in diameter
Approximately 52,000 ± 6,000 years ago (during the Pleistocene epoch).
Though some new studies date it back to even some ~580000 years, A meteorite, weighing about 2 million tonnes and traveling at around 90,000 km/hr, struck the Earth’s surface, creating a crater around 1.8 km in diameter and 150 meters deep. If you look at the satellite view and the measurement the width of the crater is reducing maybe due to water evaporation and sand filling the edges shrinking the shores.
The intense heat and pressure melted and altered the basalt rock, creating unique geological features.
What’s so special about it ?
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Basaltic Impact Crater: It’s one of the only known impact craters formed in basalt rock, as most are formed in granite or sedimentary rocks. There 4 Basaltic craters the other 3 are in brazil
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Alkaline and Saline Water: The lake has both alkaline (pH ~10.5) and saline properties, creating a unique ecosystem.
Imagine having 2 different pH water in the same lake which dont get mixed and harbour different microbial life -
Microbial Life: The lake hosts extremophile microorganisms that thrive in high salinity and alkalinity, similar to conditions found on Mars.
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Magnetic Anomalies: Studies have found unusual magnetic properties in the rocks around the crater, suggesting significant geological changes from the impact.
- IIT Mumbai studies found out that the samples from here matches with the samples brought back by Apollo Moon mission.
- The flora here is non native and different than locally found flora.
- Microorganisms activity is very interesting here. Lots of nitrogen fixing microorganisms.
Current Situation
Water Quality: The lake’s water quality has been deteriorating due to pollution and human interference.
Ecological Concerns: Algal blooms have been observed, and in June 2020, the lake’s water turned pink due to the growth of the salt-loving microorganism Haloarchaea.
Conservation Efforts: The Maharashtra government and environmental groups have taken steps to reduce pollution and preserve the lake’s ecosystem. It was also proposed to be included in UNESCO WORLD HERITAGE
- It was declared Ramsar Site in 2020 which a type of protection for wetlands.
- It is a notified National Geo-heritage Monument.
- It has many religious temples around it.
Wiki Link of Lonar Lake
Other Similar Impact Crater Lakes
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Meteor Crater (Arizona, USA): A well-preserved crater in sedimentary rock, about 50,000 years old.
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Ries Crater (Germany): Formed about 14 million years ago in sedimentary rock.
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Chicxulub Crater (Mexico): Caused by the asteroid impact linked to the extinction of dinosaurs (~66 million years ago).
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Aouelloul Crater (Mauritania): A smaller impact crater in basaltic rock (~3.1 million years old).
Lonar Lake stands out because of its formation in basaltic rock and the presence of both saline and alkaline water, making it a rare and valuable site for geological and astrobiological research.
This article was covered in 2021 in Marathi Language by an LG @C_T and lots of people interacted in comment section. Here is that post. Even one of our Indian Mod Mr @TusharSuradkar is from this area.
Link
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