Contrasting mixed siliciclastic-carbonate shelf-derived gravity-driven systems in compressional intra-slope basins (southern Hikurangi margin, New Zealand)

Along active margins, the combination of predominant tectonic activity and shallow-marine mixed siliciclastic-carbonate source systems developing upon around actively growing structures challenges traditional source-to-sink models. This study aims to investigate implications shelfal domains located in contrasting geotectonic settings (thrust forelimb backlimb) for development concomitant gravity-driven beyond shelf edges. Here, we document vertical lateral stratigraphic variabilities shelf-derived turbidites mass-transport deposits (MTDs) at outcrop-scale through integrated interpretation photogrammetry, field taphonomic data from emerged southern portion Hikurangi subduction margin. Results highlight role importance varying structural setting sediment source, whereby different morphologies regions (continent-attached forelimb, continent-detached control highly varied depositional that interact with across same confined intra-slope basin. The are tens a few hundred meters thickness have extent several kilometers. characterized by durations 1 2 Ma were primarily controlled geometries motion underlying Shelf-derived mass-wasting occurred on both sides thrust sourced attached or detached continental domain. When backlimbs however, subsequent MTDs exhibit more complex internal architectures, ultimately recording dynamic changes slope gradient, can therefore be used as proxies unraveling an individual structure. Our provides new insights better predict along backlimb. These results may important deep-marine exploration tectonostratigraphic reconstruction fold-and-thrust belts.