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Sediment Characteristics of Tidal Deposits at Mandvi, Gulf of Kuchchh, Gujarat, India: Geophysical, Textural and Mineralogical Attributes

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International Journal of Geosciences 2012年第3期3卷 515-524页

作者： Deshraj Trivedi mani christy raicy Koravangatt Devi Devender Kumar Ilya Buynevich P. Srinivasan Nagesh R. Iyer R. Guin D. Sengupta Rajesh R. Nair Department of Earth and Environmental Science Temple University 1901 N. 13th Street Philadelphia PA 19122 USA Department of Geology and Geophysics Indian Institute of Technology Kharagpur-721302 Department of Ocean Engineering Indian Institute of Technology Madras-600036 National Geophysical Research Institute Hyderabad 500606 India Structural Engineering Research Centre Chennai-600113 Variable Energy Cyclotron Centre Kolkatta 700064

The textural and mineralogical characteristics of subsurface sediments along with Ground Penetrating Radar (GPR) data collected along the Western margin of India were used to understand the depositional environments and the provenance of sediments. Textural attributes such as mean, standard deviation, skewness and Kurtosis show fluctuations due to fluvio-marine interaction and it is well understood that the bottom sediments are enriched with muddy sand, which may be deposited by mean of tidal invasion. The abundance of very coarse silt to very fine sand indicates the prevalence of low energy environment. The Linear Discriminate Function analysis indicates the fluvio marine deposition of sediments under low energy condition. GPR data upto a depth of 5 m shows the stratigraphic sequences of very fine sands and coarse silt. Optically Stimulated Luminescence (OSL) dating of sediments implies that the tidal sediments had deposited between ~30 ± 1 and ~90 ± 4 years before Present. XRD studies results the dominance of K-feldspar and deficiency of clay minerals, indicating that most of the sediments are derived from hinterland. Studies indicate that the Provenance of sediments in the Mandvi area is not related to Indus delta even though a considerable part of Gulf sediments are deposited by the Indus River.

关键词： Tidal Currents Mandvi Grain Size Analysis XRD GPR Data OSL Ages

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