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Grain size studies of sediments from beaches in the region from Mandapam to Kanyakumari, divided into 5 sectors, indicate that sediments are unimodal to polymodal in nature, coarse to fine grained, moderately to poorly sorted, and positively-negatively skewed in character. The inference to be drawn from these studies is that the variation in sedimentological parameters is governed by fluvial input, wave dynamics, and littoral transport of the sediments. Bivariant plots show that the Mandapam and Kanyakumari sectors can be classified as beach environments, whereas the Tuticorin and Valinokkam sectors come under the influence of riverine environments and the dune environment in the Manappad sector. The CM pattern of all five sectors shows a clustered distribution of sediments in the PQ and QR segments, indicating a graded mode of deposition. Visher diagrams depict a wave shadow environment for the Mandapam sector, whereas the Valinokkam, Tuticorin and Manappad sectors show double saltation populations characteristic of beaches, and the Kanyakumari sector is characterized by a more truncated population characteristic of a plunge zone, which is a high-energy environment.
Słowa kluczowe
Czasopismo
Rocznik
Tom
Strony
87--102
Opis fizyczny
bibliogr. 22 poz., wykr.
Twórcy
autor
autor
- Department of Earth Sciences, Tamil University, Thanjavur - 613 005, India, angu1@yahoo.com
Bibliografia
- Agarwal J.M., 1988, Manamelkudi sand spit - A threat to Palk Bay, Proc. 1 st Conf. Ind. Inst. Geomorphologists, Abstract V, 21-23.
- Angusamy N., Rajamanickam G.V., 2000, Distribution of heavy minerals along the beach from Mandapam to Kanyakumari, J. Geol. Soc. India, 56 (8), 199-211.
- Chandrasekar N., 1992, Beach placer mineral exploration along the Central Tamil Nadu coast, Madurai Kamaraj Univ., Madurai, 293 pp.
- Chaudhri R. S., Khan H. M. M., Kaur S., 1981, Sedimentology of beach sediments of the West coast of India, Sediment. Geol., 30, 79-94.
- Duane D.B., 1964, Significance of skewness in recent sediments, Western Pamlico Sound, North Carolina, J. Sediment. Petrol., 34 (4), 864-874.
- Folk R. L., Ward M.C., 1957, Brazos River bars: a study in the significance of grain size parameters, J. Sediment. Petrol., 27, 3-27.
- Friedman G.M., 1979, Differences in size distribution of populations of particles among sands of various origin, Sedimentology, 26, 859-862.
- Friedman G.M., 1961, Distinction between dune, beach and river sands from their textural characteristics, J. Sediment. Petrol., 31, 514-529.
- Friedman G.M., 1967, Dynamic processes and statistical parameters compared for size frequency distribution of beach river sands, J. Sediment. Petrol., 37, 327-354.
- Friedman G.M., Sanders J. E., 1978, Principles of sedimentology, Wiley, New York, 792 pp.
- Griffith J.C., 1951, Size versus sorting in Caribbean sediments, J. Geol., 59, 211-243.
- Inman D. L., Chamberlain F.K., 1955, Particle size distribution in near-shore sediments, [in:] Finding ancient shorelines, J. L. Hough & H.W.Mearad (eds.), Soc. Econ. Paleont. Miner. Spec. Publ. No 3, 106-129.
- Loveson V. J., Rajamanickam G.V., 1988, Progradation as evidenced around a submerged ancient port, Periapatnam, Tamil Nadu, India, Indian J. Land Syst. Ecol. Stud., 12, 94-98.
- Mohan P.M., 1990, Studies on the texture, mineralogy and geochemistry of the modern sediments of the Vellar estuary, Cochin Univ. Sci. Technol., Cochin, 192 pp.
- Passega R., 1964, Grain size representation by CM patterns as a geological tool, J. Sediment. Petrol., 34, 830-847.
- Rajamanickam G.V., Gujar A.R., 1993, Depositional processes inferred from the log probability distribution, [in:] Recent researches in sedimentology, V. Jhingran (ed.), Hindustan Publ. Corp., Delhi, 154-164.
- Rajamanickam G.V., Gujar A.R., 1985, Indications given by median distribution and CM patterns on clastic sedimentation in Kalbadevi, Mirya and Ratnagiri bays, Maharashtra, India, Giorn. Geol., 47, 237-251.
- Rajamanickam G.V., Gujar A.R., 1984, Sediment depositional environment in some bays in central west coast of India, Indian J. Mar. Sci., 13, 53-59.
- Rao P. S., Ramaswamy V., Thwin S., 2005, Sediment texture, distribution and transport on the Ayeyarwady continental shelf, Andaman Sea, Mar. Geol., 216 (4), 239-247.
- Schlee J., Webster J., 1967, A computer programme for grain-size data, Sedimentology, 8, 45-53.
- Udayaganesan P., A study of detrital minerals from the sediments of Vaippar basin, Tamilnadu, M. Phil. Thesis, Tamil Univ., Thanjavur, 118 pp., (unpubl.).
- Visher G. S., 1969, Grain size distributions and depositional processes, J. Sediment. Petrol., 39, 1074-1106.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUS5-0003-0011