Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Impact Origin of the Ramgarh Structure, Rajasthan: some New Evidences


Affiliations
1 Department of Geology, J.N.Vyas University, Jodhpur - 342 005
2 Department of Geology, J.N.Vyas University, Jodhpur - 342 005, India
3 Basic Sciences Research Institute, Navrangpura, Ahmedabad - 380 009, India
     

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In the absence of definite evidence, no consensus exists regarding the origin of Ramgarh structure (N 25°20': E 76°37') located in the Baran district of Rajasthan, India. A detailed survey of the structure was therefore undertaken during which we found impact spherules, diaplectic glasses and observed planar deformation features in quartz grains. These observations are indicative of impact since they require high pressure-temperature of 30-50 GPa, which is generally produced due to shock and not normally encountered in terrestrial processes such as volcanism and compression due to tectonic forces.

Keywords

Impact Features, Diaplectic Glasses, PDFs, Spherules, Ramgarh Structure, Rajasthan.
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  • Impact Origin of the Ramgarh Structure, Rajasthan: some New Evidences

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Authors

M. S. Sisodia
Department of Geology, J.N.Vyas University, Jodhpur - 342 005
G. Lashkari
Department of Geology, J.N.Vyas University, Jodhpur - 342 005, India
N. Bhandari
Basic Sciences Research Institute, Navrangpura, Ahmedabad - 380 009, India

Abstract


In the absence of definite evidence, no consensus exists regarding the origin of Ramgarh structure (N 25°20': E 76°37') located in the Baran district of Rajasthan, India. A detailed survey of the structure was therefore undertaken during which we found impact spherules, diaplectic glasses and observed planar deformation features in quartz grains. These observations are indicative of impact since they require high pressure-temperature of 30-50 GPa, which is generally produced due to shock and not normally encountered in terrestrial processes such as volcanism and compression due to tectonic forces.

Keywords


Impact Features, Diaplectic Glasses, PDFs, Spherules, Ramgarh Structure, Rajasthan.