Palaeoweathering, Tectonic Setting and Climatic Condition of Sabarmati Alluvial Plain in Ahmadabad City, Gujarat, Western India

Abstract

The present study emphasizes major elemental geochemical attributes-based prediction of nature, palaeoweathering intensity, provenance, tectonic setting and palaeoclimatic condition of source area of Sabarmati alluvial sediments lying in Ahmadabad locality, Gujarat, India. The sediments successions are comprised of gravel, poorly graded sand, with dominant silty and clayey sands, silt and clay with low-to-high level of plasticity. The sediments exhibit increasing concentration of MnO followed by P2O5, TiO2, K2O, MgO, Na2O, CaO, Fe2O3, Al2O3 and SiO2 which supports quartz dominating sand layers in comparison with silty and clayey sequences. The values of SiO2/Al2O3, Na2O/Al2O3 and K2O/Al2O3 and higher values of ICV indicate immature sediments with low dilution of ‘Na’ and ‘K’. Lithologically, the majority of sediments belong to shale and Fe-shale varieties. The values of ICV, CIA, CIW and PIA and various bivarient and discrimination diagrams reveal the mechanical fragmentation, abrasion and low to moderate degree of chemical palaeoweathering of fragments of felsic and intermediate igneous rocks of rift basin located at island arch and active continental margin under arid/semi-arid conditions sporadically interfered by short-term humid and semi-humid climatic conditions were responsible for formation of sediments sequences of the area.

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Acknowledgements

The authors are grateful to Dr. M. Ravi Kumar, Director General, Institute of Seismological Research, ISR Gandhinagar, Gujarat, India, for his kind support and encouragement for doing this research work and providing facilities of XRF analysis. The authors are thankful to Mr. Gyan Prakash Satyam, JRF, UGC-CSIR, IIT(ISM), Dhanbad, for his drawing and supportive works. The authors are thankful to Prof. B.C. Sarkar, Department of Applied Geology, IIT(ISM), Dhanbad, India, for his inspiration and providing necessary facility in preparation of present work. The help and cooperation of Shri Anubhav Sukla, IIT (ISM), Dhanbad, is thankfully acknowledged. Authors are also grateful to Prof. B. K. Rastogi, ISR, for his kind support, valuable suggestions and encouragement for doing this work. The study was supported by the Ministry of Earth Science under the Project MoES No. 115/IFD/15) and DAE-BRNS, Mumbai, India (File No. 2013/36/56-BRNS/2447).

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Correspondence to R. K. Dubey.

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Dubey, R.K., Dwivedi, V.K. Palaeoweathering, Tectonic Setting and Climatic Condition of Sabarmati Alluvial Plain in Ahmadabad City, Gujarat, Western India. Natl. Acad. Sci. Lett. 44, 21–25 (2021). https://doi.org/10.1007/s40009-020-00953-9

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Keywords

  • Geochemical indices
  • Weathering intensity
  • Provenance
  • Alluvium sediments
  • Sabarmati River basin