Abstract

Stratigraphic units during Lower Cretaceous in southern of Iraqwere affected largely by tectonic agent. Neo-Tethys oceanoccupied the distance between passive margins of Arabian andIranian plates. South of Iraq represented the continental shelf ofpassive margin of Arabian plate. This tectonic situation made thesediments in eastern parts of passive margin in south of Iraqeffected by marine agents, and the sediments in western parts waseffected by continental agents, whereas the middle parts waseffected by both agents. As result of that, three sediment regionswere formed in south of Iraq. First, marine sediment region thatoccupy the eastern part of south of Iraq near the Iraq-Iran borders.Second, mixed sediment region that occupy Basra area and extendtoward north. Third, continental sediment region that occupywestern part of Basra near the western desert. Half graben basinsthat formed by listric faults in the passive margin caused the localchanges in distribution of sediments in south of Basra. These threesediment regions formed all during Lower Cretaceous and maybeextend toward the middle of Iraq and north of Baghdad

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