--> ABSTRACT: Recent Ooids from Mesopotamian Shallow Shelf, Northwest Arabian Gulf, by Adnan A. M. Aqrawi and Fadhil N. Sadooni; #91038 (2010)

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Recent Ooids from Mesopotamian Shallow Shelf, Northwest Arabian Gulf

Adnan A. M. Aqrawi, Fadhil N. Sadooni

Petrographic and mineralogical analyses of available oolitic samples from Khor Abdulla and Khor Al-Umaya, Mesopotamian shallow shelf of the northwest Arabian Gulf, showed that the ooids exhibit extensive variations in their forms according to their nuclei shapes. The ooids cortices are usually of radial structure and are formed mainly of high magnesium calcite.

The sediment distribution of the studied area revealed the existence of an oolitic zone extending NW-SE from east of Bubiyan Island toward the open sea.

It is believed that these ooids are usually formed in sheltered environments by direct precipitation of high magnesium-calcite around any available nuclei. Then they are concentrated by agitation on small shoal-margins located to the east of Bubiyan Island. At these shoals they attained their final shapes and then dispersed through the studied area.

It is thought that these ooids represent a peculiar example of ooid formation in quiet shallow-water environments.

AAPG Search and Discovery Article #91038©1987 AAPG Annual Convention, Los Angeles, California, June 7-10, 1987.