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
Joseph, Sabu
- Textural Parameters, Discriminant Analysis and Depositional Environments of the Tcri sands, Southern Tamil Nadu
Authors
1 Department of Geology, University of Kerala, Kariavattom - 695 581, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 3 (1997), Pagination: 323-329Abstract
Results of analysis of size data by frequency curves and multi-group discriminat analysis (MGDA) indicate that inland Teri Deposits (ITDs) are very much similar to colluvium, formed by mass-wasting and fluvial processes, whereas Coastal Teri Deposits (CTDs) Very likely originated in mixed environments i.e., beach and dune. further, it is proposed that the ancestral sediments of present day CTDs would have originated from the vast reservoir of shelf sand that remained subaerially exposed during the low sea leval stands which coincided with Late Pleistocene glaciation.Keywords
Sedimentology, Teri sands, Tamil Nadu.- Rhizolithic Calcrete in Teris, Southern Tamil Nadu: Origin and Paleoenvironmental Implications
Authors
1 Department of Environmental Sciences,University of Kerala, Kariavattom - 695 581, IN
2 Department of Geology, University of Kerala, Kariavattom - 695 581, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 2 (2005), Pagination: 158-168Abstract
The Early-Modern red coastal/or inland sands ("Teris") in the coastal tract of southern Tamil Nadu show the infrequent occurrence of rhizolithic calcretes in the vadose zone. These are reddish brown coloured, cemented and cylindrical in form. No other types of rhizolith and/or calcrete have been recorded from here. Textural and mineralogical studies show that these rhizoliths contain notable amounts of acid insoluble detrital sands (essentially quartz and opaques) and mud, and are presumed to be derived from the host, i.e. teris. Petrographic studies reveal that these detritals are embedded in a micritic matrix and the carbonate cement shows rim, vein and blocky structures. Further, floating, alveolar and clotting textures are also noticed. Clay minerals in the rhizoliths include kaolinite as the singular component.Rhizoliths are presumed to be formed by surface weathering and pedogenic processes in the vadose zone. The pedogenesis of host teri sands might have released ca2+ ions and were later deposited in the ischolar_main cavities formed by the decay and complete removal of the tissues of ischolar_mains. Another source of ca2+ would be the calcareous sediments which underlies part of the teris. The absence of ischolar_main anatomy is a characteristic feature of these rhizoliths.
A sample of rhizolith collected at Sattankulam at a depth of 2.5 m gave a 14c age of 3680±110 years B.P. Hence, semiarid conditions of the present day in the Teri tract of southern Tamil Nadu, should have set in at least as way back as 3680±110 yr. B.P.
Keywords
Rhizolith, Origin, Palaeoenvironment, Teris, Tamil Nadu.- Hydrogeochemistry and Groundwater Quality in the Coastal Sandy Clay Aquifers of Alappuzha District, Kerala
Authors
1 Department of Environmental Sciences, University of Kerala, Thiruvananthapuram - 695 581, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 4 (2009), Pagination: 459-468Abstract
Groundwater qualities of coastal aquifers in the Chennam-Pallippuram Panchayath of Alappuzha district, Kerala have been extensively monitored in summer from January to May, 2007 to assess its suitability in relation to domestic and agricultural uses. The water samples (n=36) were analyzed for various physico-chemical attributes like temperature, pH, electrical conductivity (EC), dissolved oxygen (DO), Na, K, Ca, Mg, alkalinity, hardness, silica, chloride, salinity, total dissolved solids (TDS) and sulphate (SO4 2-). Values of most of these parameters fall within permissible limits. Major ionic relationships indicate that weathering reactions have insignificant role in the hydrochemical processes of the shallow groundwater system. Hydrogeochemical processes controlling the water chemistry are precipitation rather than rock- water interaction. Various determinants such as Sodium Absorption Ratio (SAR), Percent Sodium (Na %), Residual Sodium Carbonate (RSC), and Kelley's Ratio revealed that most of the samples are suitable for irrigation.Keywords
Hydrogeochemistry, Groundwater Quality, Alappuzha, Kerala.References
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Authors
1 Department of Environmental Sciences, University of Kerala, Kariavattom, Thiruvananthapuram - 695 581, IN
2 Department of Geology, University of Kerala, Kariavattom, Thiruvananthapuram - 695 581, IN
3 Centre for Earth Science Studies, P.B. No.7250, Akkulam, Thiruvananthapuram - 695 03 1, IN