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From Deposition to Deformation: The Dynamic Evolution of the Levant Continental Shelf

Frankin N (1) Gvirtzman Z (1) Sagy Y (1) Laor M (2)

(1) Geological Survey of Israel, 32 Yesha'ayahu Leibowitz, Jerusalem 9692100, Israel

(2) The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Israel

The extensive growth of the Nile Delta following the Messinian salinity crisis (~5.3 Ma) led to the formation of a continental shelf along the Levant margin, driven by alongshore sediment transport from the expanding delta. The building of the continental shelf offshore Israel was accompanied by thin-skinned extensional salt-tectonics, resulting in numerous normal faults along a narrow belt on the continental slope, 15-30 km offshore. In this study, we examine the tempo-spatial Plio-Quaternary deposition patterns (delta and shelf accretion) alongside the evolution of faulting (thin-skinned tectonics). We applied seismic stratigraphy techniques, while integrating knowledge from previous research about shelf-slope facies transitions to compile a series of paleogeographic maps documenting the shelf edge’s propagation. These maps were compared with others showing fault evolution, to examine possible connections. Fault analysis, based on mapping and dating of hundreds of growth faults using five high-resolution 3D seismic surveys, revealed fine details unavailable in regional 2D surveys. First order results indicate that faulting was not connected to shelf propagation and that faulting initiated tens of kilometers from the shelf edge. Consistent with previous studies, we show that thin-skinned salt -related faulting is located just above the Messinian salt wedge and was triggered by tectonic tilting of the continental margin, which initiated basinward salt flow. The no-correlation found between faulting and sedimentation has two exceptions, where differential sedimentary loading was found to be a dominant driver for salt expulsion. The recent (post 350 ka) activity of the Dor disturbance is, at least, partly related to rapid sedimentation over the rotating hanging wall. Additionally, offshore Egypt, faulting coincides with delta progradation that squeezes the buried salt northwards. Overall, our precise fault mapping and dating provide insights into the early stages of salt tectonics before salt withdraws basinwards and before the initial fault belt is abandoned.

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