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Stephen Pitchaimani, V.
- Depositional and Diagenetic Inferences of a Shallow Core near Tuticorin Coast, Tamil Nadu
Abstract Views :205 |
PDF Views:2
Authors
N. Gladwin Gnana Asir
1,
S. Ramasamy
2,
J. S. Armstrong-Altrin
3,
J. Madhavaraju
4,
V. Stephen Pitchaimani
2
Affiliations
1 People's Action for Development, 2/29, Sebastian Kovil Street, Vembar - 628 906, IN
2 Sedimentology Lab, Department of Geology, University of Madras, Chennai - 600025, IN
3 Centre de Investigaciones en Ciencias de la Tierra, Universidad Autdnoma del Estado de Hidalgo, Ciiidad Universitana, Carretera Pachuca-Tulancingo km. 4.5, Pachuca, Hidalgo, 42184, MX
4 Universidad Nacional, Autonoma de Mexico, Institute de Geologia, Estacion Regional del Noroeste, Hermosillo, Sonora, MX
1 People's Action for Development, 2/29, Sebastian Kovil Street, Vembar - 628 906, IN
2 Sedimentology Lab, Department of Geology, University of Madras, Chennai - 600025, IN
3 Centre de Investigaciones en Ciencias de la Tierra, Universidad Autdnoma del Estado de Hidalgo, Ciiidad Universitana, Carretera Pachuca-Tulancingo km. 4.5, Pachuca, Hidalgo, 42184, MX
4 Universidad Nacional, Autonoma de Mexico, Institute de Geologia, Estacion Regional del Noroeste, Hermosillo, Sonora, MX
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 6 (2007), Pagination: 1021-1032Abstract
An 8.8m of consolidated core obtained below 20m of unconsolidated marly sediments near the Tuticorin coast was subjected to detailed stratigraphic, petrographic and geochemical analyses. A lithological succession with eight minor Litho-Units in ascending order has been established: Shell limestone, lower sandy shell limestone, calcareous conglomerate, middle sandy shell limestone, algal limestone, upper sandy shell limestone, calcareous sandstone and calcrete. The petrographic types are mostly the variants of wackestone, boundstone, arenite and calcrete. CaO is high in shell limestone, algal limestone and sandy shell limestone and proportionately SiO2 is low in these litho-units. Algal limestone is enriched in MgO content, The conversion of high Mg-calcite to low Mg-calcite, aragonite inversion as well as mixed zone diagenetic setting resulted in depletion of both δ13C and δ18O, The petrographic evidence and assemblage of the juvenile gastropods, pelecypods, bryozoans, algae and benthic foraminifers suggest a fluctuating inner neritic to a moderately high saline lagoonal depositional environment. The absence of sparry calcite indicates an early marine to mixed zone diagenetic settings and the shell limestone unit experiences a moderate burial diagenesis while the upper units experience a shallow burial diagenesis. A Late Tertiary age is assigned to the shell rich limestone unit.Keywords
Depositional And Diagenetic Environments, Petrography, Stable Isotopes, Shallow Core, Tuticorin Coast, Tamil Nadu.- Petrography and Surface Textures on Quartz Grains of Nimar Sandstone, Bagh-Begs, Madhya Pradesh - Implications for Provenance and Depositional Environment
Abstract Views :185 |
PDF Views:2
Authors
J. Madhavaraju
1,
S. Ramasamy
1,
S. P. Mohan
1,
S. M. Hussain
1,
N. Gladwin Gnana Asir
1,
V. Stephen Pitchaimani
1
Affiliations
1 Department of Geology, School of Earth and Atmospheric Sciences, University of Madras, Guindy Campus, Chennai- 600 025, IN
1 Department of Geology, School of Earth and Atmospheric Sciences, University of Madras, Guindy Campus, Chennai- 600 025, IN