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Sedimentological Characteristics of transitional Zone Between Marine- Non Marine Miocene Sediments in Selected Sections –Northern Iraq. | ||
| Tikrit Journal of Pure Science | ||
| Article 1, Volume 11, Issue 1, 2006, Pages 137-144 | ||
| Author | ||
| Mumtaz Ahmed Ameen | ||
| Abstract | ||
| The main objective of this study is to describe the sedimentological attributes of the transitional zone between marine (Fat ha Formation) and non-marine(Injana Formation) Miocene deposits in four selected sections in northern Iraq.Three of these sections are located on the basin edge-paleoshoreline(Kand , Bashiqa , Sheikhan) while the fourth is in the center of the basin(Sheikh Ibrahim).Distinction is appropriated by emphasizing litholosical differences which hightened thickness variation-rock type dominance in tandem with faunal and partial geochemical correlation with salinity.In this context,the comparison indicated a thickness variation from 450 m in the basin center to 110 m or less in the basin edge.Dissimilarity in rock type abundance shows higher availability of carbonate-evaporite in basin center while clastic are more developed at the edge and enriched with oyster. Likewise,faunal variations in carbonate microfacies (mudstone, wackestone,packstone, and graistone) reveal miliolids association in the lower interval and becomes subdued toward the top of the section where it is replaced by rotalids , in accordance with shallowing-upward. The evidence from clay minerals analysis shows broad agreement with the influence of depositional environment among other factor.Illite shows higher relative abundance in Bashiqa and is replaced by Kaolinite-Chlorite in Kand,while illite-chlorite and MXL dominate the central site at Sheikh Ibrahim. Compatible result is obtained from P2O5 in carbonate where increases upward and exhibit abroad but inverse relationship with salinity. Taking into account these lines of collective evidences, it is inferred that the Miocene deposits of the transitional zone were deposited In spectrum of costal environments that included lagoon —bay, estuary Delta and deeper marine basin. | ||
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