Evolution from syn?rift carbonates to early post?rift deep?marine intraslope lobes: The role of rift basin physiography on sedimentation patterns

The stratigraphic architecture of Early Jurassic strata exposed along a >10 km long transect in the Chachil Graben, an exhumed marine rift depocentre Neuquén Basin (Argentina), provides insights into sedimentological and expression syn-rift to post-rift transition. A change from intrabasinal carbonate extrabasinal siliciclastic sedimentation is recorded, as well variations sediment supply dispersal patterns across rift-related topography. late was marked by transgression development shallow-marine system, including platform deposits perched on fault-block highs periplatform accumulated lows, which overlies continental volcano-sedimentary deposits. Differential subsidence basin deepening induced retrogradation progressively drowned overlain organic-rich calcareous mudstone that draped structures at onset early post-rift. first influx led progradation intraslope lobe complex graben, associated with kilometre-scale clastic injectites. depositional architecture, facies distribution pinch-out style lobes record effects inherited compaction hinge, acted oblique counterslope gravity flows. occurrence combined-flow bedforms, widespread erosion, limited segregation bearing different hybrid event bed types, sharp contrast characteristics existing models. Documentation transition stratigraphy permitted identification changes thickness resulting passive infill topography differential compaction. This contrasts markedly those developed during normal faulting. Furthermore, influence local key improve subsurface prediction sandstone quality assessment hydrocarbon reservoirs carbon storage sites.