Abstract
The existing stratigraphic framework of the Eocene-Miocene in the study area (sector 5) shows limited temporal stratigraphic and structural resolution. Using this framework, it is difficult to unravel the influence of possible local tectonic movements and eustatic sea level changes on sedimentation. The precise influence of the onset of the possible Late Eocene-Early Oligocene orogenic phase, which caused inversion and uplift in the study area (sector 5), is also dubious as a result of the limited data. To improve the correlations and recognition of the Eocene to Oligocene successions in the area in question (from sector 1 to sector 8), a new stratigraphic interpretation, based on correlated lithostratigraphic columns from different outcrops, is presented. The changes in sedimentation and tectonic events in the study area can be correlated to time-equivalent sea level changes and tectonic uplift in Al Jabal Al Akhdar area, which suggests that the processes causing the sedimento/structural activity are of regional importance.
Highlights
IntroductionThe study area (Figure 1) is located in the northwestern part of Al Jabal Al Akhdar and consists of eight sectors (sectors 1 - 8), covering an area of about 100 km
The missing of the Oligocene section from sector 5 and its vicinity could be attributed to Late Eocene-Oligocene uplift resulted in severe widespread erosion of the Oligocene sediments
The result of this study is an illustration of the occurrence of possible small-scale tectonic activity during periods, which were previously thought to be tectonically calm
Summary
The study area (Figure 1) is located in the northwestern part of Al Jabal Al Akhdar and consists of eight sectors (sectors 1 - 8), covering an area of about 100 km. There are at least nine wadis running from SE to NW direction, parallel to each other, formed by channel incision followed by deepening and widening processes under the influence of erosion and tectonics. The stratigraphic framework of the recognized EoceneMiocene section in sector (5) shows few information (Figure 2) as a result of the limited data available for this interval. The data from detailed outcrops information from (sectors 1 - 8) (Figure 3) are only available to reveal more proximal understanding to the depositional settings, and to unravel the relative influence of local tectonics and sea level variations on the Eocene-Miocene sedimentation in the area in question
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