An alternative view on size and impact history of Ramgarh Crater, India: Evidence from high-resolution remote sensing imagery and gravity data

The Ramgarh structure of south-east Rajasthan is currently established as an asteroid impact crater in India that was excavated in undeformed target sedimentary rocks of the Vindhyan Supergroup of Meso- to Neoproterozoic age. The size of this impact crater is debatable, and two opposing ideas of ~2....

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Bibliographic Details
Published in:Journal of Earth System Science 2023-05, Vol.132 (2), p.78, Article 78
Main Authors: Misra, Saumitra, Srivastava, Pankaj K, Ghosh, Sambhunath, Das, Arnab K, Dey, Shikendha K, Ray, Dwijesh
Format: Article
Language:English
Subjects:
Asteroid collisions
Asteroid impact
Asteroids
Bouguer anomalies
Colour
Craters
Earth and Environmental Science
Earth Sciences
Geomorphology
Gravity
Gravity data
Image resolution
Imagery
Landsat
Landsat satellites
Magnetic fields
Morphology
Remote sensing
Satellite imagery
Satellite observation
Satellites
Sedimentary rocks
Software
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Spatial data
Spatial discrimination
Spatial resolution
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Summary:The Ramgarh structure of south-east Rajasthan is currently established as an asteroid impact crater in India that was excavated in undeformed target sedimentary rocks of the Vindhyan Supergroup of Meso- to Neoproterozoic age. The size of this impact crater is debatable, and two opposing ideas of ~2.4 km and ~10 km diameter exist. The geomorphology of the crater has been re-evaluated using a Sentinel-2A false-coloured imagery of band combination 8, 4, 3 (spatial resolution 10 m) and Landsat-7 Satellite panchromatic imagery of Path/Row 146/042 and SRTM data (spatial resolution 30 m), along with satellite Bouguer gravity data downloaded from GGMplus besides our routine geological field work. Our observation on satellite imageries suggests that the geomorphologic high (~200 m) encircling the Ramgarh structure represents the actual crater’s rim which has a diameter of ~2.4 km. Our satellite gravity data show that the maximum negative Bouguer anomalies (–60 to –51 mGal) only coincide with this geomorphological high surrounding the Ramgarh structure, confirming this structural high of diameter ~2.4 km represents the rim of the crater.
ISSN:0973-774X
0253-4126
0973-774X
DOI:10.1007/s12040-023-02093-2