A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Pawar, N. J.
- Early Holocene Waterfall Tufa from Semi-Arid Maharashtra Plateau (India)
Authors
1 School of Environmental Sciences, Dept. of Geography, University of Poona, Pune-411 007, IN
2 School of Environmental Sciences, University of East Anglia, Norwich, GB
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 32, No 6 (1988), Pagination: 513-515Abstract
Waterfall tufa occurring in the semi-arid parts of the Upland Maharashtra has been dated by employing uranium series disequilibrium dating method. The dates correlate well with other evit1lences and suggest a wet climate during the genesis of the tufa.- Geochemistry of Carbonate Precipitation from the Ground Waters in Basaltic Aquifers: An Equilibrium Thermodynamic Approach
Authors
1 Department of Geology, University of Poona, Pune - 411007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 41, No 2 (1993), Pagination: 118-131Abstract
The geochemistry of ground waters in the basaltic aquifers is considerably modified by the incongruent dissolution of augite and plagioclase from basalts. The analyses of the water chemistry data by using the WATSPEC aqueous-model computer programme for computing the ionic species abundances, the partial pressures of CO2 (PCO2) and mineral Saturation Indices (SIc and SId) suggest. that the ground waters are supersaturated with respect to calcite and dolomite. The modeling has indicated a state of equilibrium with respect to dolomite first followed by calcite. This state of equilibrium can be linked with the selective dissolution of augite leading to Mg-rich alkaline environment. which is also favourable for the formation of montmorillonite clays. The clays in turn act as a buffer and as a result the levels of Ca and Na do not exceed 1.8 mmol/L concentration. Due to the early dolomite saturation the Ca/Mg ratios areless than unity, whereas Na/Ca ratios are above unity suggesting precipitation of calcite and possibility of input from zeolites and mixing of difierent sources of water with local ground water.
The precipitation of calcite is under high PCO2 conditions related to degassing and diffusion of CO2 at the water-table and along cracks, joints and fissures in the basalts. The high PCO2, dissolved oxygen content, presence of contaminants and fluctuations in the water table suggest that the ground water has chemically evolved under open system conditions.
Keywords
Geochemistry, Hydrogeology, Basalt Aquifers, Carbonate.- Trace Element Geochemistry of Groundwater from Behedi Basin, Nasik District, Maharashtra
Authors
1 Department of Geology, University of Pune, Pune - 411 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 5 (1999), Pagination: 501-514Abstract
Studies carried out on trace element geochemistry of groundwater from Behedi basin have shown spatial as well as temporal variations. While the spatial variations have been attributed to land use practices in the basin, the temporal changes indicated input of trace elements from soil zone due to rain-fed recharge. On the basis of spatio-temporal variations, weathering of rocks and human activity have been identified as the potential sources of trace elements in the groundwater. The budgeting of trace elements in the groundwater suggests that the rate of flushing of Cu is highest from the vadose zone to phreatic zone followed by Fe, Zn, Mn, Pb and toxic trace elements like Hg and As.Keywords
Groundwater, Geochemistry, Trace Elements, Maharashtra.- Spectacular Basalt Columns of Panhala-Masai Range, Maharashtra:A Potential Geoheritage Site in The Deccan Traps
Authors
1 Department of Geology, SP Pune University, Pune - 411 007, IN
2 D.Y. Patil College of Engineering and Technology, Kolhapur - 416 006, IN
3 Gopal Krishna Gokhale College, Kolhapur - 412 012, IN
4 Dr D. Y. Patil Vidyapeeth, Pimpri, Pune - 411 018, IN
5 Formerly at Department of Geography, SP Pune University, Pune - 411 007, IN
Source
Current Science, Vol 115, No 4 (2018), Pagination: 626-628Abstract
The ~65 Ma old Deccan Traps cover about 0.5 million km2 in western and central India. The Deccan Traps region has huge geotourism potential with several potential geoheritage sites1–3. We report here the occurrence of spectacular columns in basalt near Bandivade village (16°49′18″N and 74°01′0″E), in Kolhapur district, Maharashtra (Figure 1).References
- Sheth, H., Saman, H., Patel, V. and D’Souza, J., Geoheritage, 2017, 9, 359–372.
- Kale, V. S. (ed.), Atlas of Geomorphosites in India, Indian Institute of Geomorphologists, Allahabad, 2017, p. 132.
- Sheth, H., A Photographic Atlas of Flood Basalt Volcanism, Springer International Publishing, 2018, p. 363.
- Ollier, C. D. and Sheth, H. C., J. Earth Syst. Sci., 2008, 117, 537–551.
- Widdowson, M. and Cox, K. G., Earth Planet. Sci. Lett., 1996, 137, 57–69.
- Renne, P. R. et al., Science, 2015, 350, 76–78.
- Tomkeieff, S. I., Bull. Volcanol., 1940, 6, 89–146.
- Long, P. E. and Wood, B. J., Geol. Soc. Am. Bull., 1986, 97, 1144–1155.
- Bardintzeff, J.-M. and McBirney, A. R., Volcanology, Jones and Bartlett, 2000, p. 268.
- Lyle, P., J. Geol. Soc. London, 2000, 157, 715–722.
- DeGraff, J. M. and Aydin, A., Geol. Soc. Am. Bull., 1987, 99, 605–617.
- Goehring, L. and Morrisa, S. W., J. Geophys. Res., 2008, 113, B10203; doi:10.1029/2007JB005018.
- Goehring, L., Mahadevan, L. and Morrisa, S. W., Proc. Natl. Acad. Sci. USA, 2009, 106, 387–392.
- Lamur, A. et al., Nature Commun., 2018, 9, 1432; doi:10.1038/s41467-018-03842-4.
- Hetenyi, G. et al., Bull. Volcanol., 2012, 74, 457–482.
- Brocx, M. and Semeniuk, V., J. Roy. Soc. W. Aust., 2007, 90, 53–87.
- ProGeo, Geodiversity, Geoheritage and Geoconservation. The ProGEO simple guide, the European Association for the Conservation of the Geological Heritage, 2017; http://www.progeo.ngo/downloads/ProGEO_leaflet_EN_2017.pdf (accessed on 6 June 2018).