Date of Award
Master of Science (MS)
Dr. Fathy H. Mohamed
Dr. Philip Goodell
The present study aims at assessing the geological environment of some selected areas along the coastal zones of the Arabian Gulf (northern coast) and the Gulf of Oman (eastern coast). Eight stations were selected for this study; these include three stations from the Gulf of Oman (Khor Fakkan, Kalba and Fujairah) and five stations from the Arabian Gulf (Dubai, Sharjah, Ajman, Umm Al-Quwen and Ras A1-Khaimah). 25 sediment samples were collected and subjected to grain-size analysis, X-ray diffraction analysis, microfacies and petrographic study and chemical analysis. Shell samples were collected from the same sites using 50x50x10 cm box. These shells were studied from the taxonomic aspect and a comparison between faunal distributions in both gulfs was carried out. Grain-size analysis of the collected samples shows that the Arabian Gulf coast is covered by coarse sand, whereas the Gulf of Oman coast is covered by medium sand. The great similarities between sediments of both gulfs in sorting, skewness and kurtosis may be due to the short distance between the two gulfs. X-ray diffraction analysis revealed that sediments from the Gulf of Ornan coast are rich in minerais that are derived from the nearby ophiolitie exposures of the Oman Mountains. Marine input to these sediments is minimum and becomes noticeable only ¡n Khor Fakkan. On the other hand, carbonate minerals represent the majority in the sediments of the Arabian Gulf coast. Sediment samples were also analyzed to detónnine the concentrations of Al, Fe, Mg, Ca, Na, K, P, Mn, As, Ba, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sr, V and Zn. Geochemical data revealed high variations in the distribution of elements between the Gulf of Oman coast nd the Arabian Gulf coast.
There are higher concentrations of Ca and Sr in the Arabian Gulf sediments than in the Gulf of Oman sediments, this is attributed to the high abundance of carbonates in the sediments of the Arabirni Gulf coast. The higher concentrations of Mn, Ni, Cr, Cu, Zn, As, V, Mo, Fe203 and MgO are observed in the Gulf of Oman sediments, this is attributed to the nature of outcrops, which are dominated by ophiolitic rock types. The concentrations of trace metals in the studied sites along the Gulf of Oman coast e controlled mainly by the mineralogy of the land-derived fragments, whereas the contribution of man-made enrichment upon the absolute concentration is minimal. On the other hand, the lower concentrations of trace metals in the Arabian Gulf coast indicate that metal pollution in the studied area is very limited or absent.
Mohamed AIrashidi, Mouza Rashid, "Geological Assessment of the Intertidal Environment in Some areas Along the Arabian Gulf And Gulf of Oman Coastal Region, UAE: A Comparative study." (2004). Theses. 571.