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Compositional variations, chemical weathering, and provenance of sands from the Cox’s Bazar and Kuakata beach areas, Bangladesh

  • H. M. Zakir Hossain
  • Quazi Hasna Hossain
  • Atsushi Kamei
  • Daisuke Araoka
Original Paper
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Abstract

The modal and chemical composition of sands from Cox’s Bazar beach (CBB) and Kuakata beach (KB) areas of Bangladesh has been investigated to infer their maturity, chemical weathering, and provenance signatures. The CBB and KB sands are typically high quartz, low feldspar, and lithic fragments, representing a recycled orogen source. Major element compositions of CBB sands are characterized by high SiO2 (83.52–89.84 wt%) and low Al2O3 (4.39–6.39 wt%), whereas KB sands contained relatively low SiO2 (63.28–79.14 wt%) and high Al2O3 (9.00–11.33 wt%) contents. The major, trace and rare earth element (REE) compositions of beach sands display comparable distribution patterns with enriched Th and SiO2 for both sands relative to upper continental crust (UCC). Pb, Rb, Y, and Fe for KB sands are little higher than UCC and the rest of the elements are marked depleted for both suites reflecting destruction of plagioclase and K-feldspar during fluvial transportation. The CBB and KB sands are compositionally low mature to immature in nature subsequently classified as subarkose and litharenite, respectively. Chondrite-normalized REE patterns for CBB and KB sands show LREE enrichment and nearly flat HREE (LaN/YbN, 7.64–9.38 and 5.48–8.82, respectively) coupled with prominent Eu anomalies (Eu/Eu*, 0.51–0.72 and 0.52–0.76, respectively), suggesting felsic source provenance. The provenance discrimination diagrams, immobile trace element ratios (Th/Sc, Zr/Sc, Ce/Sc, and Ti/Zr), and REE (∑LREE/HREE, Eu/Eu* and GdN/YbN) parameters indicate that CBB and KB sands were largely derived from felsic source rocks, with compositions close to average rhyolite, granodiorite, granite, and UCC.

Keywords

Geochemistry Modern sands Cox’s Bazar beach Kuakata beach Bangladesh 

Notes

Acknowledgments

The authors would like to thank Mostafa Tarek, Abu Hena Md. Nasimul Jamil, and Md. Mahbubur Rahman (JUST) for their logistic support during fieldwork in CBB and KB areas and for assistance in sample preparation. Thanks also to Barry P. Roser and Yoshikazu Sampei for their partial analytical support in this research work. We would also like to thank Abdullah M. Al-Amri, Editor-in Chief, and two anonymous reviewers for their helpful comments on earlier version of the manuscript.

Supplementary material

12517_2018_4111_Fig10_ESM.png (304 kb)
Appendix 1.

Selected major element-Al2O3 variation diagrams for the Cox’s Bazar beach and Kuakata beach sands of Bangladesh. Solid and dashed lines are indicative detrital trends in the CBB and KB sand samples (fitted by eye). (PNG 303 kb)

12517_2018_4111_MOESM1_ESM.eps (1.5 mb)
High resolution image) (EPS 1580 kb)
12517_2018_4111_Fig11_ESM.png (300 kb)
Appendix 2.

Selected trace element-Al2O3 variation diagrams for the Cox’s Bazar beach and Kuakata beach sands of Bangladesh. Solid and dashed lines are indicative detrital trends in the CBB and KB samples (fitted by eye). (PNG 299 kb)

12517_2018_4111_MOESM2_ESM.eps (1.5 mb)
High resolution image (EPS 1570 kb)

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • H. M. Zakir Hossain
    • 1
  • Quazi Hasna Hossain
    • 2
  • Atsushi Kamei
    • 2
  • Daisuke Araoka
    • 3
  1. 1.Department of Petroleum and Mining EngineeringJessore University of Science and TechnologyJessoreBangladesh
  2. 2.Department of GeoscienceShimane UniversityMatsueJapan
  3. 3.Geological Survey of JapanNational Institute of Advanced Industrial Science and TechnologyTsukubaJapan

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