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Université de Fribourg

Downslope-shifting pockmarks: interplay between hydrocarbon leakage, sedimentations, currents and slope’s topography

Ho, Sutieng ; Imbert, Patrice ; Hovland, Martin ; Wetzel, Andreas ; Blouet, Jean-Philippe ; Carruthers, Daniel

In: International Journal of Earth Sciences, 2018, vol. 107, no. 8, p. 2907–2929

Pockmarks in Pliocene-Quaternary continental slope deposits offshore Angola show features related to: (1) fluid leakage craters that formed repeatedly, (2) authigenic methane-derived carbonates that indicate the (former) presence of hydrocarbons and (3) erosional–depositional structures that are clearly related to current activity. Depending on topography, the pockmarks show differing...