Abstract
Regional-scale variations in soil geochemistry were investigated with special reference to differences among soil groups and lithology in an area of 9,699 km2 in Medak district, Andhra Pradesh, India. The concentrations of 29 elements (major: Si, Al, Fe, Mn, Mg, Ca, Na, K, Ti, P and trace: As, Ba, Cd, Co, Cr, Cu, F, Mo, Ni, Pb, Rb, Se, Sr, Th, U, V, Y, Zn, Zr) in 878 soil samples collected (557-topsoil, 321-subsoil) at a sampling density of 1 site/17 km2 from 557 sites representative of all the soil types present in studied area were determined, and their elemental composition are discussed. The baseline levels of these elements in soils are determined over different lithological units for the identification of anomalous values relative to these. For the first time, geochemical maps for Medak district are prepared on 1:50,000 scale and the lithogeochemical database generated provides information on the lateral and vertical distribution of elements in soil. The spatial variations in the distribution of elements reflect underlying geologic characteristics. Box-plots reveal that the concentration of most of the elements in soils were not strongly dependent on the soil group but the soil-geochemistry abruptly changes with the change in the soil parent materials indicating that the distribution of elements is mostly influenced by the bedrock lithology and other natural processes acting on them. For instance, the concentrations of Co, Cu, Fe, Mn, Ti, V and Zn are high in soils developed on basaltic terrain while the soils developed on granitic and gneissic terrain exhibit high elemental concentrations of K, Pb, Rb, Si, Th and Y. Alfisols had relatively high contents of elements while entisols had lower concentrations of most of the elements. The database can be used in the chemical characterisation of different geological units as well as applications in various environmental and agricultural fields. The results indicate that regional geology is an important determinant of soil geochemical baselines for soil pollution assessment and further emphasizes the importance of determining background levels locally. The defined baselines can be used to establish background values for future soil surveys.








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Acknowledgments
This paper is a part of the project entitled “Regional Geochemical Baseline Mapping, in Medak district, Andhra Pradesh, India” funded by DST, New Delhi which is duly acknowledged. The author gratefully acknowledges Director, NGRI, for giving permission to publish this paper. Thanks are due to Drs. V.P. Dimri, Y.J. Bhaskar Rao, N.N. Murthy and O.P. Pandey for their constant support and encouragement. Timely guidance from Dr. David Smith (USGS) for the refinement of manuscript is duly acknowledged. The author would also like to acknowledge Mr. A.K. Krishna for help with X-ray fluorescence analysis. Thanks are due to ICRISAT, Patancheru, for carrying out soil particle size distribution. The helpful suggestions made by the anonymous reviewer are gratefully acknowledged.
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Dantu, S. Spatial distribution and geochemical baselines of major/trace elements in soils of Medak district, Andhra Pradesh, India. Environ Earth Sci 72, 955–981 (2014). https://doi.org/10.1007/s12665-013-3014-7
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DOI: https://doi.org/10.1007/s12665-013-3014-7


