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GEOCHEMICAL CHARACTERIZATION OF THE PERMIAN–TRIASSIC TRANSITION AT OUTCROP, CENTRAL SAUDI ARABIA

This study presents the results of chemostratigraphic analyses and spectral gamma‐ray logging integrated with sedimentological data across the Permian‐Triassic boundary at a measured outcrop section in central Saudi Arabia. The studied section encompasses the uppermost part of the Midhnab Member and the Lower and Upper Khartam Members of the Khuff Formation. Lithofacies were interpreted to have been deposited in subtidal, tidal to supratidal, lacustrine and meandering fluvial / flood plain, marginal marine and lagoonal depositional environments. Integration of bulk geochemical and carbon isotope (δ13C) data allowed the identification of a stratigraphic interval with a negative shift in δ13C ratio values, which was interpreted to correspond to the end‐Permian mass extinction event. The end of this “first negative shift in δ13C values” is taken to mark the Permian‐Triassic boundary. Above this boundary and just below an interval containing scattered thrombolites, a second negative shift in δ13C ratios was observed, and corresponds to an interval with long‐term uranium depletion as indicated by the bulk sediment geochemical and spectral gamma‐ray uranium data.