Distribution and Significances of the Major Oxides in Recent Coastal Sabkha Sediments of the Al-Dafna Plateau, Northeast Tobruk, Libya

Authors

  • Ahmed. A. Mohammed Geology Department, Science Faculty, Tobruk University, Tobruk, Libya

DOI:

https://doi.org/10.37375/sjfssu.v1i2.82

Keywords:

Al-Dafna plateau, Major oxides, Intertidal sabkha, Supratidal sabkha, Wadis mouths.

Abstract

Twenty sabkha samples were chemically analyzed by XRF technique for determination of their major oxides concentrations. Six cores penetrated both the intertidal and supratidal flat zones developed in six wadis mouths in the coastal stretch of the Al-Dafna plateau, northeast Tobruk city. The significance distribution and concentration of the major oxides are discussed and interpreted. Elements in the raw material of the study area reflect important evidence of geochemical weathering processes that affecting parent rocks as well as conditions of sedimentation, and rate of deposition. Correlation coefficients have been used to illustrate the abundance and distribution of these elements.
The distribution of major oxides are follows Si2O > CaO > LOI > Al2O3 > SO3 > MgO > Na2O > K2O. The vertical distribution of major elements is mainly controlled by the abundance and proportions of the clastics, carbonates and evaporite minerals. It was found that silica present in the form of detrital, subrounded to rounded silt- to sand-sized quartz grains, while the content of Al2O3 is associated with terrigenous argillaceous materials. On the other hand, the presence of Fe2O3 is related to the abundance of clastic materials in sabkha deposits. It was found that K2O and Na2O concentrations increase toward the sabkha surfaces.

References

Albarede, F. (2003). Geochemistry: An introduction. Cambridge, Cambridge University Press, 248 pp.

Al-Harram, F. (1997). The Libyan Coast. Publications of the Center for Research and Consultations, University of Garyounis, Benghazi, First Edition. (Translated From Arabic).

Brand, U. and Veizer, J. (1980). Chemical diagenesis of a multicomponent carbonate system; 1, Trace elements. Journal of Sedimentary Research, 50(4), 1219-1236.

Ernest, W., (1970). Geochemical Facies Analysis. Methods in Geochemistry and Geophysics. Elsevier Publishing Company. Amsterdam, London, New York, 152 p.

Hem, J. D., (1970). Aluminum-abundance in natural waters and in the atmosphere. In K. J., Wedepohl (Editor), Handbook of Geochemistry, v. II-2, 334 p Springer, Berlin.

.Lerner, L. (2011). Small-scale synthesis of laboratory reagents with reaction modeling. CRC Press.

Loerting, T., Kroemer, R. T., and Liedl, K. R. (2000). On the competing hydrations of sulfur dioxide and sulfur trioxide in our atmosphere. Chemical Communications, (12), 999-1000.

Mohamed, A. (1993). Depositional environments of some Miocene rocks in northern Western Desert, Egypt. Unpublished M.Sc. Thesis, Alexandria Univ., Egypt, 144 pp.

Moore Jr, C. H. and Billings, G. K. (1971). Preliminary model of beachrock cementation, Grand Cayman Island, BWI. In: Bricker, O.P. (Ed.), Carbonate cements. Baltimore, John Hopkins University Press, Baltimore, 40-43.

Murray, R. W., Brink, M. R., Gerlach, D. C., Russ III, G. P. and Jones, D. L. (1992). Interoceanic variation in the rare earth, major, and trace element depositional chemistry of chert: perspectives gained from the DSDP and ODP record. Geochimica ET Cosmochimica Acta, 56(5), 1897-1913.

Potts, P.J., Williams-Thorpe, O. and Webb, P.C. (1997). The bulk analysis of silicate rocks by portable X-ray fluorescence: effect of sample mineralogy in relation to the size of the excited volume. Geostandards Newsletter, 21(1), 29-41.

Prudêncio, M. I., Gonzalez, M. I., Dias, M. I., Galan, E., and Ruiz, F. (2007). Geochemistry of sediments from El Melah lagoon (NE Tunisia): a contribution for the evaluation of anthropogenic inputs. Journal of Arid Environments, 69 (2), 285-298.

Ramsey, M. H., Argyraki, A., & Thompson, M. (1995). On the collaborative trial in sampling. Analyst, 120(9), 2309-2312.

Rollinson, H. R., Searle, M. P., Abbasi, I. A., Al-Lazki, A. I., and Al Kindi, M. H. (2014). Tectonic evolution of the Oman Mountains: an introduction. Geological Society, London, Special Publications, 392(1), 1-7.

Taylor, S. R., and S. M. McLennan (1985) The continental crust. Its evolution and composition, Blackwell Sci., Oxford. 312 p.

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Published

2021-10-28

How to Cite

Mohammed, A. A. (2021). Distribution and Significances of the Major Oxides in Recent Coastal Sabkha Sediments of the Al-Dafna Plateau, Northeast Tobruk, Libya. Scientific Journal for Faculty of Science-Sirte University, 1(2), 12–19. https://doi.org/10.37375/sjfssu.v1i2.82