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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 |
PDF Views:2
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 :184 |
PDF Views:107
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.- Impact Origin of the Ramgarh Structure, Rajasthan: some New Evidences
Abstract Views :177 |
PDF Views:2
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.- Characterization of Mukundpura Carbonaceous Chondrite
Abstract Views :266 |
PDF Views:82
Authors
Affiliations
1 78, BGT Extension, Jodhpur 342 005, IN
2 Department of Physics, Indian Institute of Technology, Jodhpur 342 005, IN
3 Basic Sciences Research Institute, Navrangpura, Ahmedabad 380 009, IN
1 78, BGT Extension, Jodhpur 342 005, IN
2 Department of Physics, Indian Institute of Technology, Jodhpur 342 005, IN
3 Basic Sciences Research Institute, Navrangpura, Ahmedabad 380 009, IN
Source
Current Science, Vol 114, No 01 (2018), Pagination: 214-217Abstract
Two meteorite fragments collected from the Mukundpura impact site, Rajasthan, India have been analysed using scanning electron microscopy, energy dispersive X-ray spectroscopy, Mössbauer spectroscopy, thermogravimetric analysis (TGA) and Raman spectroscopy. High Fe (22.65 wt%), Ni (1.53%) and S (3.69%) and concentrations of other elements obtained by X-ray analysis indicate that it is a carbonaceous chondrite. Mossbauer spectra show similarity with those obtained from Cold Bokkeveld and Murchison carbonaceous chondrites, and this analogy allows us to classify it as belonging to CM group of carbonaceous chondrites. TGA shows large weight loss, implying presence of significant amount of volatiles in this meteorite and Raman spectroscopy shows the presence of abundant organic matter consisting of disordered and aromatic (graphitic or polyaromatic) carbon. These results indicate that Mukundpura meteorite is a rare type of extraterrestrial object deserving further in-depth studies.Keywords
Carbonaceous Chondrite, Chemical Composition, Meteorite Fragments, Spectral Analysis.References
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- Ashley, King, J., Solomon, J. R., Paul, Schofield, F. and Russell, S. S., Characterizing the CI and CI like carbonaceous chondrites using thermogravimetric analysis and infrared spectroscopy. EarthPlanets Space Sci., 2015, 67, 198–211.
- Matrajt, G., Borg, P., Raynal, I., Djouadi, Z., d’Hendecourt, I., Flaynn, G. and Deboffle, D., FTIR and Raman analyses of the Tagish Lake meteorite: relationship with the aliphatic hydrocarbons observed in the diffuse interstellar medium. Astron. Astrophys., 2004, 416, 983–990.