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Geology of little Lonar, Central India : Plausible evidences for an impact event Anurema G B Nair

By: Material type: TextTextPublication details: Department of Geology, University of Kerala 2023Subject(s): DDC classification:
  • GEOPGD460 2023 Anurema G B Nair
Summary: The study emphasis on investigating the impact analogy of Little Lonar, carved out in the Deccan Volcanic Province in Central India. The area is found to be associated with the famous Lonar Crater, which is identified as an impact crater and a notified National Geo-heritage Monument, and thus, it is important to know more about the study area. The study area is located between 19°59'11′′ N and 19°59'24′′ N latitudes and 76°30'37′′ E and 76°30'43′′ E longitudes, in the Survey of India topographic sheet No. 56A/5, 56 A/9 of scale 1:50,000. Field investigations gave an idea about the types of rocks of the terrain. The petrographic and geochemical analysis are carried out during this study which helped in further identification of rock with special emphasis on various impact indicators. The petrographic study provided information about the different impact features such as fracturing, diaplectic glass, planar fracture (PF), kink in feldspar thatsubstantiate the objective of the study. The SEM/EDS data of sample ALL 4 gives insight into the fractures that are developed in the plagioclase grain. Geochemical analysis using XRF aided in plotting primitive mantle normalised trace element plot and Harker variation diagram in which certain trace and major elements shows similitude to the impact breccia of Lonar crater.
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Book Book Dept. of Geology Dept. of Geology GEOPGD460 2023 Anurema G B Nair (Browse shelf(Opens below)) Available GEOPGD460

The study emphasis on investigating the impact analogy of Little Lonar, carved out in the
Deccan Volcanic Province in Central India. The area is found to be associated with the famous
Lonar Crater, which is identified as an impact crater and a notified National Geo-heritage
Monument, and thus, it is important to know more about the study area. The study area is
located between 19°59'11′′ N and 19°59'24′′ N latitudes and 76°30'37′′ E and 76°30'43′′ E
longitudes, in the Survey of India topographic sheet No. 56A/5, 56 A/9 of scale 1:50,000. Field
investigations gave an idea about the types of rocks of the terrain. The petrographic and
geochemical analysis are carried out during this study which helped in further identification of
rock with special emphasis on various impact indicators. The petrographic study provided
information about the different impact features such as fracturing, diaplectic glass, planar
fracture (PF), kink in feldspar thatsubstantiate the objective of the study. The SEM/EDS data
of sample ALL 4 gives insight into the fractures that are developed in the plagioclase grain.
Geochemical analysis using XRF aided in plotting primitive mantle normalised trace element
plot and Harker variation diagram in which certain trace and major elements shows similitude
to the impact breccia of Lonar crater.

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