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Luminescence chronology of the inland sand dunes from SE India

  • Dontireddy Venkat Reddy (a1), Vuddaraju Singaraju (a2), Rakesh Mishra (a2), Devender Kumar (a1), Puthusserry Joseph Thomas (a1), Karra Kameshwa Rao (a2) and Ashok Kumar Singhvi (a3)...

Abstract

Records of past climate changes have been preserved variously on the earth's surface. Sand dunes are one such prominent imprint, and it is suggested that their presence is an indicator of periods of transition from arid to less arid phases. We report inland sand dunes from Andhra Pradesh (SE India) spread over an area of ~ 500 km2, ~ 75 km inland from the east coast. The dune sands are examined to understand their provenance, transportation, timing of sand aggradation and their relationship to past climates. The dune distribution, grain morphology and the grain-size studies on sands suggest an aeolian origin. Physiography of the study area, heavy mineral assemblage, and abundance of quartz in the parent rocks indicate that the dune sands are largely derived from first-order streams emanating from hills in the region and from weathering of the Nellore schist belt. It appears that the geomorphology and wind direction pattern both facilitated and restricted the dune aggradation and preservation to a limited area. OSL dating of 47 dune samples ranged from the present to ~ 50 ka, thereby suggesting a long duration of sand-dune aggradation and/or reworking history.

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Corresponding author

*Corresponding author. E-mail address: dvreddy.ngri@gmail.com (D.V. Reddy).

References

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Luminescence chronology of the inland sand dunes from SE India

  • Dontireddy Venkat Reddy (a1), Vuddaraju Singaraju (a2), Rakesh Mishra (a2), Devender Kumar (a1), Puthusserry Joseph Thomas (a1), Karra Kameshwa Rao (a2) and Ashok Kumar Singhvi (a3)...

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