Impact of faulting in depocentres development, facies assemblages, drainage patterns, and provenance in continental half‐graben basins: An example from the Fanja Basin of Oman

Fault throw gradients create transverse folding, and this can influence accommodation creation sedimentary routing infill patterns in extensional half-graben basin. The Fanja basin (Oman) offers an excellent outcrop of alluvial fan succession displaying cyclical stacking basin-scale growth-fold patterns. These unique conditions allow for investigation fault-timing development related to fault-transverse folding. Our study combines geological mapping, structural analysis, logging correlation, bulk mineralogical compositions. Mapping reveals that the is bounded by a regional-scale fault, with local depocentres changing position response syncline anticline ascribed fault-displacement gradients. Qahlah Formation (Late Cretaceous) unconformably overlying Semail Ophiolite, it turn overlain marine Jafnayn Paleocene). Facies stratigraphic analysis allows subdividing into four informal units, from base top: (i) laterite topographic depressions ophiolite, (ii) greenish pebbly sandstones, deriving axially draining braided streams deposited low-relief This green grades vertically red Qahlah, formed fanglomerates floodplain mudstones, drainage fault-parallel increasing distance main fault. be divided (iii) Wadi al Theepa member, found western depocentre, higher immaturity sand:mud ratio, suggesting more proximal source, (iv) Al Batah located eastern part latter shows better sorting, lower prominent graded sub-units. It also eastward expansion orthogonal monocline, developed relay ramp. Changes facies depositional are consistent differential composition. Green composed quartz lithic mafic rock fragments, sourced ophiolite schists metamorphic basement. Red chert kaolinite Hawasina Nappe footwall master changes source area linked unroofing fault-footwalls domal structures during collapse Ophiolite. novelty resides linking sedimentology fault displacement events controlling fault-perpendicular its on depocenter generation architecture. approach seldom considered seismic rarely analysed studies, thus placing results among key outcrop-based contributions field.