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    Studies on the shelf sediments off the Madras coast

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    Bull_Natl_Inst_Sci_India_38_442.pdf (321.0Kb)
    Date
    1968
    Author
    Rao, Ch.M.
    Murty, P.S.N.
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    Abstract
    Sediment samples collected from the shelf and slope regions along two sections normal to the coast off Madras and Karaikal and from a few stations in between have been studied for their grain size, coarse fraction constituents and calcium carbonate content. Grain size study has shown that the sediments off Madras are mainly sandy in nature and vary from fine to very fine sands in the nearshore and outer shelf regions to medium to coarse sands in the midshelf region. Off Karaikal they vary from coarse sands in the nearshore region to fine sands and silts in the outer shelf and slope regions. Coarse fraction studies have revealed among other things the occurrence of oolites in association with shallow water benthic foraminifera like Rotalia beccarii etc., in sediments beyond 30 fathoms depth, from which it was deduced that these sediments might have been laid down when the sea level was relatively lower than the present day level and were not covered by the present day deposition of terrigenous sediments. The calcium carbonate content increases progressively with depth along these two sections and varies from 1.75% to 37% off Madras and from 6% to 54% off Karaikal
    URI
    http://drs.nio.org/drs/handle/2264/5986
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