• D Chandrasekharam

      Articles written in Journal of Earth System Science

    • Anomalous SO4−Cl groundwater in the coastal aquifer, Kerala

      D Chandrasekharam

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      Groundwater in laterite along the northern part of the Kerala coast shows anomalous concentration of SO4 and Cl ions. Investigation based on the chemical characteristics of groundwater, rain and Arabian seawater together with results of the laterite-water interaction experiment and sea-aquifer water-chemical mixing models show that Tertiary sediments in this region are the main source contributing SO4 and Cl ions to the groundwater system.

    • Magnetic anomalies over the Andaman Islands and their geological significance

      P B V Subba Rao M Radhakrishna K Haripriya B Someswara Rao D Chandrasekharam

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      The Andaman Islands form part of the outer-arc accretionary sedimentary complex belonging to the Andaman–Sumatra active subduction zone. The islands are characterized by thick cover of Neogene sediments along with exposed ophiolite rocks at few places. A regional magnetic survey was carriedout for the first time over the Andaman Islands with a view to understand the correlation of anomaly signatures with surface geology of the islands. The residual total field magnetic anomaly maps have revealed distinct magnetic anomalies having intermediate to high amplitude magnetic signatures andcorrelate with the areas over/close to the exposed ophiolite rocks along the east coast of north, middle and the south Andaman Islands. The 2D modelling of magnetic anomalies along selected E–W profiles across the islands indicate that the ophiolite bodies extend to a depth of about 5–8 km and spatiallycorrelate with the mapped fault/thrust zones.

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