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Volume :13 Issue : 1 1986      Add To Cart                                                                    Download

Petrography and diagenesis of Quaternary oolitic sediments in northern Kuwait, Arabian Gulf

Auther : F. I. K H A L A F * A . A. AL-SHAMLAN** A N D M. I. EL-SAYED*

* Environmental and Earth Sciences Division, Kuwait Institute for Scientific Research, P.O.Box 24885, Safat, Kuwait; and **Department of Geology, Faculty of Science, University of Kuwait, P.O. Box 5969, Kuwait

 

ABSTRACT

 

Two ridges of Quaternary oolitic sediments occur in Al-Doha area, northern Kuwait. The first extends in an E-W direction along the coastline and is succeeded landward by a second ridge which is older and rests on pre-Pleistocene deposits. The first (more seaward) ridge is composed mainly of ooids with subordinate proportions of peloids, shell fragments and quartz grains (oolitic limestone ridge). The second ridge is also chiefly composed of ooids but quartz grains and skeletal fragments arc much more abundant than in the first ridge (quartz-oolitic limestone ridge). Subaerial cementation was observed in the oolitic limestone ridge, but it is better developed in the quartz-oolitic limestone ridgc where the sparry calcite cement increases in crystal size and fills most of the intergranular pores. Some micritic peloids have been almost completely recrystallized to sparry calcite and all the grains are covered by fringes of sparry calcite cement.

 

The oolitic limestone ridge is correlated with the younger and older oolitic limestones of

Al-Khiran area, and the quartz-oolitic limestone correlates with the quartz-oolitic sandstone and oolitic quartzose sandstone of Al-Khiran.

 

The oolitic deposits of Al-Doha area are diagenetically immature and this can be attributed to insufficiency of meteoric water required to complete the diagenetic development of the deposits.

 

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