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Periakali, P.
- A Note on Glandulina spinata Cushman - A Rare Foraminiferal Species from Inner Shelf Sediments of Bay of Bengal, off Karikkattukuppam, Near Chennai, Southeast Coast of India
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Authors
Affiliations
1 Department of Applied Geology, University of Madras, Guindy College Campus, A.C. College Building, Chennai 600 025, IN
2 Antarctic Study Centre, Vasco-da-Gama, Goa 403 802, IN
1 Department of Applied Geology, University of Madras, Guindy College Campus, A.C. College Building, Chennai 600 025, IN
2 Antarctic Study Centre, Vasco-da-Gama, Goa 403 802, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 54, No 3 (1999), Pagination: 309-313Abstract
Studies on Recent foraminifera from inner shelf sediments of the Bay of Bengal, off Karikkattukuppam, near Chennai (latitude 13°04'N; longitude 80°17'E), revealed the presence of a rare foraminiferal species. Taxonomic observations reveal this spinose taxon to be Glandulina spinata Cushman and is reported herein for the first time from Indian waters. Available data suggest it to be a tropical, inner shelf dwelling taxon, with a preference for muddy substrate.Keywords
Palaeontology, Recent, Foraminifera, Taxonomy, Inner Shelf, Bay of Bengal.- Ostracod Kotoracythere inconspicua (Brady) from the Palk Bay, off Rameswaram, Southeast Coast of India: its Zoogeography and Ecology
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Authors
Affiliations
1 Department of Applied Geology, University of Madras, Guindy Campus, Chennai - 600 025, IN
2 Department of Geology, School of Earth and Atmospheric Sciences, University of Madras, Guindy Campus, Chennai - 600 025, IN
3 Department of Geology, National College, Tiruchirappali - 620 001, IN
1 Department of Applied Geology, University of Madras, Guindy Campus, Chennai - 600 025, IN
2 Department of Geology, School of Earth and Atmospheric Sciences, University of Madras, Guindy Campus, Chennai - 600 025, IN
3 Department of Geology, National College, Tiruchirappali - 620 001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 6 (2007), Pagination: 981-986Abstract
The shallow marine and tropical ostracod taxon Kotoracythere inconspicua(Brady) is encountered from the surface sediments of Indian waters Fifty-Two sediment and bottom water samples were collected over an year, representing the four seasons, in a transect (depth 0-13 m) off Rameswaram, southeast coast of India. Living specimens of this species are found in all the seasons. Systematics and ecology of the species are presented Biogeographically, this taxon has an extremely wide distribution in tropical, littoral zones of all oceans, excepting east Pacific. Its wide geographic distribution is explained through currents and by passive dispersal by ships.Keywords
Ostracoda, Ecology, Biogeography, Palk Bay, Indian Ocean.- Geochemistry of Groundwater in Ultrabasic and Peninsular Gneissic Rocks, Salem District, Tamil Nadu
Abstract Views :159 |
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Authors
Affiliations
1 Department of Applied Geology, University of Madras, Guindy Campus, Chennai - 600 025, IN
1 Department of Applied Geology, University of Madras, Guindy Campus, Chennai - 600 025, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 1 (2003), Pagination: 63-73Abstract
Mineralogic, hydrogeologic and geochemical data of ultrabasic and Peninsular gneissic rocks of Salem covering an areal extent of about 194 km2 around Salem magnesite mine area were employed to determine the source of solutes to groundwater and to assess the chemical weathering processes. The results indicate that the flux of dissolved solids from the abandoned mines are controlled by interaction between ultrabasic rocks and materials derived from local bedrock. Mass balance calculations indicate that dissolution of feldspar and ferromagnesian minerals releases Na, Ca and Mg. The average denudation rate was found to vary from 0.3 to 4.2 tons/km2/yr for a discharge of 5.3 × 1081/yr, and from 0.5 to 8 tonnes/km2/yr for a discharge of 10 × 105 1/yr. Mineral solubility study of Mg-phase in the system shows that serpentine is the dominant Mg2+ contributor.Keywords
Groundwater, Geochemistry, Ultrabasics, Peninsular Gneiss, Salem, Tamil Nadu.- Geochemistry of Groundwater in Ultrabasic and Peninsular Gneissic-Rocks, Salem District, Tamil Nadu
Abstract Views :186 |
PDF Views:128
Authors
Affiliations
1 Geohouse, H.No.2-3-173, Road No.2, Adarsh Nagar, Nagole, Hyderabad - 500 068, IN
2 Department of Applied Geology, University of Madras, Guindy Campus,Chennai - 600 025, IN
1 Geohouse, H.No.2-3-173, Road No.2, Adarsh Nagar, Nagole, Hyderabad - 500 068, IN
2 Department of Applied Geology, University of Madras, Guindy Campus,Chennai - 600 025, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 62, No 5 (2003), Pagination: 653-654Abstract
No Abstract.- Geochemistry of Pichavaram Mangrove Sediments, Southeast Coast of India
Abstract Views :175 |
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Authors
Affiliations
1 Climate Change Research Unit, Department of Applied Geology University of Madras, Guindy Campus, Chennai 600 025, IN
1 Climate Change Research Unit, Department of Applied Geology University of Madras, Guindy Campus, Chennai 600 025, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 55, No 4 (2000), Pagination: 387-394Abstract
Fourteen sediment samples collected from Pichavararn mangrove were analysed for grain size, organic carbon, sedimentary sulphur, calcium carbonate, Fe, Mn, Al, Cu, and Hg. Factor analysis was carried out to infer the mechanisms controlling the behaviour of metals. Four factors accounted for around 75% variance. Fe, Mn, and Hg are associated with organic carbon and fine fraction content of the sediments and loaded onto factor I whlch accounted for 33.6% variance. This is due to the complexation of Fe, Mn, and Hg with organic matter and the adsorption of these organo-metallic compounds onto the finer sediments due to their high surface/volume ratio and presence of surface charge. Factor 2 accounted for 18.6% variance and is loaded with CaCO3, finer fraction, Al and Cu, implying contribution of Al and Cu from detritai clay minerals. The association of CaCO3, with this factor is not clearly understood. Factor 3 is loaded with organic carbon and coarse fraction of the sediments and it accounted for 13.3% variance. The association of organic carbon with coarse fraction of the sediments could be either due to the Ca2+ and Mg2+ ions induced adsorption of organic matter onto mineral grains, or due to the presence of coarse vegetal debris. The fourth factor accounted for 9.8% variance and is loaded with sedimentary sulphur; no metal is associated with this factor. This explains that though sulphate reduction occurs in the surface sediments, it could not result in the burial of Fe, Cu, and Hg as their respective sulphides. This could be due to their back oxidation by Mn oxides present in the sediments where upon FeS is converted to Fe hydrous oxide, and Cu and Hg are released to the water column.Keywords
Geochemistry, Sediments, Pichavaram Mangroves, Trace Metals, East Coast of India.- Deposition, Degradation and Preservation of Organic Carbon in the Pulicat Lake, Tamil Nadu, East Coast of India: Preliminary Results
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Authors
Affiliations
1 Climate Change Research Unit, Department of Applied Geology, University of Madras, Guindy Campus, Madras- 600025, IN
1 Climate Change Research Unit, Department of Applied Geology, University of Madras, Guindy Campus, Madras- 600025, IN