Fluvial Response to Late Quaternary Tectonic Changes in the Dhadhar River Basin, Mainland Gujarat

The study aims at reconstruction of the Dhadhar dranage system during Late Quatemay applying geomorphic and stratigraphic criteria. Remote sensing data show occurrence of palaeodrainages in the area between the Dhadhar and Orsang Rivers. The exposed sediment records of these river basins, lakes and ponds mainly in the areas where there is no drainage help in reconstructing the palaeodrainage. The exposed sediment succession in the lakes and ponds show a thick fluvial sequence (Gm and Sh) overlain by a 4-5 m thick black organic rich finely laminated lacustrine clays (FC). The sedimentary records and mineralogy of the Dhadhar and Orsang basins are quite similar and correlatable. The course of Orsang River which flowed through the Dhadhar River during Late Pleistocene was changed during Early Holocene due to tectonic uplift along the major faults in the area.