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PALEOCENE SEQUENCE DEVELOPMENT IN THE IRAQI WESTERN DESERT | ||
| Iraqi Bulletin of Geology and Mining | ||
| Article 1, Volume 11, Issue 3, 2015, Pages 1-18 | ||
| Authors | ||
| Buthaina S.M. Al-Jibouri; Ali D. Gayara | ||
| Abstract | ||
| The Paleocene succession in the Iraqi Western Desert, represented by Akashat Formation, is developed through six third order cycles. Local tectonism and eustacy caused the subdivision into several cycles. The K/T boundary is represented by a transgressive surface; correlated with the major Global Paleocene Transgression. The Early Paleocene succession was mainly controlled by the eustatic component and the resultant eustatic subsidence. During the Middle Paleocene; a major transgression had caused the extension of the basin eastward and shows interbedding of basinal-deep-shallow open marin facies reflecting minor relative sea level fluctuation. The Late Paleocene consists of a retrogradational pattern of deep or basinal facies of the TST bounded by a maximum flooding surface (MFS); this MFS is determined by marls rich with planktonic foraminifera of Late Paleocene age (Globanomalina pseudomanirdii Zone). This cycle ends up with a characterastic zone of coprolites rich with oysters, Operculina spp., Nummulites deserti, Lenticulina sp., and Late Paleocene planktonic (keeled). | ||
| Keywords | ||
| Paleocene; Sequence; Biozones; rd order cycle; Iraq | ||
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