Variations in carbonate-evaporite shoreline and ramp facies trends: Middle Miocene Fatha Formation, Kurdistan Region, NE Iraq

Abdullah, Heero Ghareeb; Collier, Richard E. Ll.; Mountney, Nigel P.

doi:10.1016/j.jafrearsci.2021.104351

Cited by 2 publications

(1 citation statement)

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“…As a result, it is primary gypsum precipitated chemically as precipitation from an oversaturated solution that was isolated as a lagoon from marine water without bacterial action (Awadh and Al-Ankaz, 2016). Abdullah et al (2021) published a study of deposits of Middle Miocene on the Zagros basin, A flooding surface separates between 10 and 40 depositional cycles, recording general basinward progradation. Each cycle has an upward trending shallowing tendency, from the microfacies of the calcareous mudstone (low energy) at the base to the microfacies of rudstone and grainstone with algae (high energy) above.…”

Section: Introductionmentioning

confidence: 99%

Depositional Properties of the Middle Miocene Fatha Formation, in K Oilfield, Southern Iraq

Hassan

Al-Jaberi

Salim³

2022

IGJ

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The Fatha Formation, formerly known as the Lower Fars Formation, was deposited in a shallow basin, southern Iraq during the Middle Miocene. By using the description of the cores, we found large heterogeneity in the lithology; contains a mixing of limestones, mudstone, marl, marly limestone, sandstone, and gypsum, or anhydrite. In this study, the Fatha Formation was divided into three main units according to lithofacies, namely, marl, marl-anhydrite, and limestone, in addition to, the presence of thin evaporitic and sandstone layers along with the formation but thicker with marl. X-ray diffraction and SEM tests which are accurate methods to identify the mineralogy enable inference of a high percent of the dolomite, calcite, and anhydrite; this may be attributed to the formation environment, In addition to the presence of some clay minerals such as illite and palygorskite. The petrographic details, microfacies analysis, and depositional environment studies led to recognition of four main microfacies including mudstone, wackestone, packstone, and grainstone; and nine sub microfacies were deposited in a shallow part of the inner ramp at three zones: peritidal, lagoon, and shoal.

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Section: Introductionmentioning

confidence: 99%