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Deep‐sea avulsion and morphosedimentary evolution of the Rhône Fan Valley and Neofan during the Late Quaternary (north‐western Mediterranean Sea)

The Petit‐Rhône Fan Valley (north‐western Mediterranean) is a broad, sinuous, filled valley that is deeply incised by a narrow, sinuous thalweg. The valley fill is differentiated into three seismic subunits on high‐resolution seismic‐reflection profiles. The lower chaotic subunit probably consists of channel lag deposits that seem to be in lateral continuity with high‐amplitude reflections representing levee facies. The intermediate transparent subunit, which has an erosional base and clearly truncates levee deposits, is interpreted to be mass‐flow deposits resulting from the disintegration of the fan‐valley flanks. The upper bedded subunit shows an overall lens‐shaped geometry and the seismic reflections onlap either onto the top of the underlying transparent subunit or onto the Rhône levees. Piston core data show that the upper few meters of this upper subunit consist of thin turbidites, probably deposited by overflow processes. The few available 14C ages suggest that the upper stratified subunit filled the Petit‐Rhône Fan Valley between 21 and 11 kyr BP.