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Sinha, R.
- Salinity Model Inferred from Two Shallow Cores at Sambhar Salt Lake, Rajasthan
Authors
1 Engineering Geology Group, Department of Civil Engineering, Indian Institute of Technology, Kanpur - 208016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 2 (2000), Pagination: 213-217Abstract
The Sambhar lake of central Rajasthan, located between Ajmer and Jaipur, is a hypersaline lake. The present study focuses on the mineralogy of the lacustrine sediments of this region. X-ray diffraction patterns of shaflow auger hole samples show a broad pattern of fluctuation in vertical profiles. It is apparent that rock weathering in the catchment area supplies a flux of clastic minerals like quartz, feldspar and mica during the wet period. This is followed by an evaporite sequence of carbonate-sulfate-chloride in dry climate. Thus, an abundance of calcite indicates the beginning of evaporation, while later stages are characterized by the dominance of thenardite and finally of halite.Keywords
Sedimentology, Sediment Geochemistry, Clay Minerals, Evaporites, Saline Lake.- Studies on Holocene Climatic Changes From Priyadarshini Lake Sediments, East Antarctica: The Palynological Evidence
Authors
1 Department of Geology, University of Lucknow, Birbal Sahni Institute of Palaeobotany, Lucknow - 226 007, IN
2 Birbal Sahni Institute of Palaeobotany, Lucknow - 226 007, IN
3 Indian Institute of Technology, Kanpur - 208 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 1 (2007), Pagination: 92-96Abstract
Pollen analysis of a sediment core from Priyadarshini Lake (Core S3), East Antarctica, has revealed the climatic oscillations in the region since Holocene. Three pollen zones have been identified on the basis of recovered pollen taxa and varying frequencies. Between 10,000 and 9,000 yr BP, cold and dry climate prevailed in the region as reflected by the dominance of grasses, Acritarch and very low frequencies of Cosmarium - a fresh water alga. The lake was probably shallow and smaller in dimension during this period. Between 9,000 to 2,400 yr BP, relative increase in grasses is witnessed though in fluctuating frequencies. Cosmarium also exhibits a distinct increasing trend, whereas Acritarch declines considerably. This overall change in the assemblage reflects the onset of warm and moist climate and the lake had a wider expansion during this phase on account of amelioration in climate than witnessed before. Between 2,400 and 1,000 yr BP, relatively reduced frequencies of grasses, coupled with total disappearance of Cosmarium, demonstrate that the climate changed once again to cold and dry. However, 1,000 yr BP onwards, marked increase in grasses coupled with exceedingly high values of Cosmarium implies that the climate ultimately turned warm and moist.Keywords
Palynology, Holocene, Climate Changes, Priyadarshini Lake, Antarctica.- Quaternary Stratigraphy and Sedimentology of the Kotra Section on the Betwa River, Southern Gangetic Plains, Uttar Pradesh
Authors
1 Engineering Geosciences Group, IIT Kanpur - 208 016, IN
2 Departrnent of Earth Sciences, Dalhousie University, Halifax, Nova Scotia, B3H 355, CA
3 Departmen of Geology, University of Delhi, Delhi - 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 4 (2005), Pagination: 441-450Abstract
Floodplain deposits are exposed in an about 29 rn high cliff section at Kotra along the Betwa river, a tributary of the Yamuna river at the southern margin of the Gangetic Plains. The Betwa is a peninsular river originating in the Bundelkhand Craton parts of which are exposed as bedrock close to the sectipn. The Betwa river is incised and bordered by an extensive zone of badland (dissected into gullies). The.stratigraphic units comprise pedogenized floodplain muds and reworked carbonate grayels that fill small plains-fed channels. Gully, fills of mud and gravel mark extensive degradational surfaces that divide the section into discontinuity-bounded units, currently of unknown'duration and age. Closely spaced discontiquities low in the section may mark a former interfluve level, after which a thick floodplain succession accumulated up to the level of the modem clifftop. Presence of prominent discontinuities and thick floodplain deposits in the cliff sections suggest that the late Quaternary history of the southern plains is marked by cycles of channel incision and floodplain degradation and alluviation.Keywords
Quaternary, Allostratigraphy, craton-Sourced river sedimentation, Betwa river, Gangetic plain, Uttar Pradesh.- Depositional Environment in a Fresh Water Lake in Leastern Antarctica Inferred from Shallow Sediment Cores
Authors
1 Engineering Geology Group, Indian Institute of Technology, Kanpur - 208 016, IN
2 Bhabha Atomic Research Centre, Bombay, Mumbai, IN
3 Birbal Sahni Institute of Paleobotany, 53 University Road, Lucknow, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 6 (2003), Pagination: 717-723Abstract
Data on geochemical analysis of sediment cores obtained from Lake Priyadarshini, Schirmacher Range, Eastern Antarctica is presented. Elemental distribution in vertical profiles has been correlated with the redox cycles which provide information about depositional environment. Very low sedimentation rate is inferred in the periglacial environment of Antarctica with a very limited sediment supply. A 14C age of ∼8 kyr indicates that the lake formed in early Holocene as a result of major deglaciation after the end of the last glacial period.Keywords
Lacustrine Sedimentation, Geochemistry, Holocene, Radioisotopes, Antarctica.- Report on the Second Meeting of IGCP 449: Global Correlation of Late Cenozoic Fluvial Sequences
Authors
1 Department of Civil Engineering, IIT, Kanpur - 208 016, IN
2 Department of Geology, Delhi University, Delhi - 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 4 (2002), Pagination: 386-386Abstract
No Abstract.- Giant Subcutaneous Leiomyosarcoma at Knee Joint:Malignant Tumour at Rare Site
Authors
1 Department of Pathology & Laboratory Medicine, All India Institute of Medical Sciences, Patna, IN
Source
International Journal of Medical and Dental Sciences, Vol 5, No 2 (2016), Pagination: 1279-1282Abstract
Primary subcutaneous leiomyosarcoma (LMSs) are uncommon of all soft tissue malignancies. Its frequency is about 1% to 2%, with a predilection for middle age, and found more frequently in the lower extremity. They can be of two types according to its primary site of origin: deep subcutaneous and superficial cutaneous. The physical appearance of this tumour resembles more with benign condition and can easily be mistaken for nonmalignant condition. Hence, it is important to diagnose it correctly and it is important to differentiate it from other spindle cell neoplasm.
A case of giant subcutaneous leiomyosarcoma is presented here which was found around knee in lower extremity. The diagnosis was suspected by histopathology and confirmed by immunohistochemistry.
Keywords
Leiomyosarcoma, Malignant, Lower Extremity, Subcutaneous, Knee Joint.References
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- Influence of Geomorphometric Factors on Satellite Snow Covered Area vs Snowmelt Runoff Relationship in the Punjab Himalaya
Authors
1 Department of Earth Sciences, University of Roorkee, Roorkee-247 667, IN
2 Engineering Geology Group, Department of Civil Engineering, IIT, Kanpur - 208 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 48, No 4 (1996), Pagination: 449-456Abstract
In the Himalayas, snowmelt runoff makes a dominant contribution to the total annllal stream flow. An early prediction of the amount of runoff to be derived from the snow pack is, therefore, of great importance for proper management of water resources. The area selected for the present investigation is the Punjab Himalayas comprising three major catchments of the Beas, Ravi, and Chenab rivers. Landsat imageries have been used to map snow cover in these three catchments. Data from a number of discharge gauging stations on the Beas, Ravi and Chenab rivers have been used to yield snowmelt runoff. Unique relationships between satellite snow cover and snowmelt runoff have been obtained for each of the sub-catchments. The studies show that geomorphometric parameters have a systematic influence on the relationship between snow cover area and subsequent runoff. The relationships are interpreted for their physical implications.Keywords
Geomorphology, Geohydrology, Satellite Data, Punjab Himalaya.- Dielectric and Resistivity Behaviour of Y0.95Gd0.05CrO3 Nanoparticles
Authors
1 Department of BS&HU, Asansol Engineering College, Asansol 713305. WestBengal, IN
Source
Indian Science Cruiser, Vol 34, No 4 (2020), Pagination: 12-14Abstract
In this work Y0.95Gd0.05CrO3 nanoparticles are prepared following sol-gel synthesis procedure. Characterization is followed by X-Ray diffraction, Transmission Electron Microscopy and Ultraviolet-Visible Spectroscopy measurements. Band gap of the sample is estimated using Ultraviolet-Visible spectroscopy data. The dependence of dielectric constant with frequency is measured for the experimental sample. From the temperature dependence of resistivity it can be said that the sample is semiconducting in nature. The value of dc activation energy has been measured also.Keywords
sol-gel method, nanoparticles, dielectric permittivity, resistivity.References
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