Facies analysis and early diagenesis of the Middle-Late eocene Dammam Formation, Abu Dhabi, United Arab Emirates
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Within onshore Abu Dhabi, United Arab Emirates, the Middle-Late Eocene Dammam Formation can be separated into three distinct units on the basis of lithological analysis. Petrographic analysis shows these units to consist of interbedded yellow-brown marl and shale with gray bioclastic packstone/grainstones and mudstone/wackestones. Dolomite and gypsum occur locally in the upper half of the section. A lithostratigraphy and facies analysis of the Damman suggests cycling between the grain-supported and mud-supported limestones, and with pulses of terrigenous material producing the marly and shaley interbeds.
The diagenetic history of the Damman is dominantly a reduction of porosity primarily due to secondary cementation by two generations of calcite and the recrystallization of unstable grains and cement, as opposed to dissolution. In addition, dolomitization, which often has the effect of creating good secondary porosity, which is only local in extent.
The Damman of the onshore Abu Dhabi is interpreted in the area to represent a transitional period between the more restricted limestones of the underlying Lower Eocene Rus Formation and the more complex sub-environments of the overlying Oligocene Asmari Formation.
KeywordsForaminifera Kuwait Micrite Grainstones Dolomitization
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