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Bhandari, N.
- The Geochemistry of Uranium and Thorium Isotopes in the Salt Lakes and Adjacent Ground Waters of Rajasthan
Abstract Views :165 |
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Authors
Affiliations
1 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
1 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 1 (1986), Pagination: 90-101Abstract
The concentrations of 238U, 234Th and (234U238U) activity ratios and major ion chemistry of several water samples from the salt lakes and their adjacent ground waters in Rajasthan have been measured. 234Th concentration in all the samples, except in one high alkalinity water from the Sambhar Lake, are quite deficient relative to its parent 238U the average (234Th/238U)activity ratio being 0.12. This deficiency corresponds to a mean residence time of - 5 days for 234Th in these waters. In the high alkalinity water, 234Th concentration is at near equilibrium with 238U, yielding a residence time much longer than radioactive mean life. The long residence time of Th in high alkalinity waters may result from the complexing of 234Th by (CO3)-2 ion. 238U concentration in some of the ground waters near the salt Iakes are high, the highest being in a Didwana sample, 565 dpm/l, The Didwana samples also have the highest (234U238U) activity ratios observed for Indian waters. The high uranium concentration in the Didwana ground water is suggestive of uranium rich aquifer solids.
- Nuclear Tracks (Earth Sciences, Space Sciences and Nuclear Physics)
Abstract Views :182 |
PDF Views:105
Authors
Affiliations
1 Physical Research Laboratory Ahmedabad, IN
1 Physical Research Laboratory Ahmedabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 30, No 3 (1987), Pagination: 244-245Abstract
No Abstract.Full Text
- Impact Origin of the Ramgarh Structure, Rajasthan: some New Evidences
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Authors
Affiliations
1 Department of Geology, J.N.Vyas University, Jodhpur - 342 005
2 Department of Geology, J.N.Vyas University, Jodhpur - 342 005, IN
3 Basic Sciences Research Institute, Navrangpura, Ahmedabad - 380 009, IN
1 Department of Geology, J.N.Vyas University, Jodhpur - 342 005
2 Department of Geology, J.N.Vyas University, Jodhpur - 342 005, IN
3 Basic Sciences Research Institute, Navrangpura, Ahmedabad - 380 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 4 (2006), Pagination: 423-431Abstract
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.- Impact Origin of the Ramgarh Structure, Rajasthan : Some New Evidences
Abstract Views :186 |
PDF Views:187
Authors
Affiliations
1 Geology Department, J N Vyas University, Jodhpur- 342 005
2 Geology Department, J N Vyas University, Jodhpur- 342 005, IN
3 Basic Sciences Research Institute, Navrangpura, Ahmedabad - 380 009, IN
1 Geology Department, J N Vyas University, Jodhpur- 342 005
2 Geology Department, J N Vyas University, Jodhpur- 342 005, IN
3 Basic Sciences Research Institute, Navrangpura, Ahmedabad - 380 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No Spl Iss 3 (2006), Pagination: 561-565Abstract
No Abstract.Full Text