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Volume :21 Issue : 2 1994      Add To Cart                                                                    Download

Morphology, sedimentology, and mineralogy of southern islands in kuwait, Arabian Gulf

Auther : A. N. AL-GHADBAN

Environmental and Earth Sciences Division, Environmental Sciences Department,Kuwait Ins itute for Scientific Research, P.O. Box 24885 13109, Safat. Kuwait

ABSTRACT

The morphological setting of three islands (Kubbar, Qaro and Umm Al-Maradem) in the northwestern part of the Arabian Gulf are reviewed and analyzed. The concept that the formation of these islands are related to sea level fluctuation is proposed. Their morphological settings imply the occurrence of two stages of sea-level fluctuations during the Pliocene Pleistocene.

Textural and mineralogical properties of the recent surficial sediments of these islands have been investigated. It was observed that the central parts of  Kubbar and Umm Al-Maradem (comparatively larger in size than Qaro) are covered primarily by fine clastics (silty sand), whilst the coarser material (sandy sediments) are generally observed in the coastal and some inland areas as well as being the dominant grain size on Qaro Island. This also implies the effect of the hydrodynamic regime (high-energy zone) which characterizes the southern part of Kuwait.

The mineralogical investigation of the various size fractions of the island’s surficial sediments reveals that they are polygenetic in origin. Two primary sources for the island sediments were recognized, namely: (a) autochthonous materials derived from the degradation of a variety of invertebrates, especially from the coral communities as well as erosion of submerged ancient sediments and (b) coral debris which are derived from the surrounding coral communities by wave action and as a result of SE swell. Fallout from dust storms also contributes to the sediment budget of these islands.

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