Quantitative analysis of the stratigraphic architecture of incised-valley fills: A global comparison of Quaternary systems

摘要: Abstract Facies models of the internal fills incised valleys developed in shelf and coastal settings during cycles relative sea-level change are largely conceptual, descriptive qualitative form; moreover, they commonly bespoke to individual examples. Here, a database-driven quantitative statistical analysis 87 late-Quaternary incised-valley (IVFs) has been undertaken assess general validity predictive value classical facies for IVFs, investigate importance possible controls on their stratigraphic organization. Based datasets from published literature stored sedimentological database, geometry proportion systems tracts, architectural elements different hierarchies within IVFs quantified. These variables were analysed how vary relation parameters that represent potential controlling factors: stage, continental-margin type, drainage-basin area, valley geometry, basin physiography shoreline hydrodynamics. The organization studied coastal-plain is generally consistent with represented models, primary control being rate magnitude change. However, results this study demonstrate significant variability architectures which not accounted by existing models. Variations architecture cross-shelf can be attributed other than sea level, expressed relationships physiography, catchment river-system size following findings arise research. (i) Compared counterparts passive margins, hosted active margins contain, average, higher fluvial deposits lower central-basin estuarine deposits; tend however thicker. This suggests IVF exerted distinct characteristics tectonic setting host continental notably rates mode sediment supply, nature load. (ii) thickness lowstand tract positively correlated dimensions, likely reflecting role area dictating scale carved infilled valleys. (iii) Positive correlations observed between deposits, bayhead-delta versus dimensions area. sediment-supply accommodation determined size. (iv) barrier-complex mean gradient indicate might establishment preservation barrier-island environments located shelf. (v) Correlations width present-day tidal range at dynamics may contribute widening correlation tide-dominated highstand width, suggesting effects interplays hydrodynamic conditions infills. highlights complexity valleys, must considered when attempting application rock-record interpretations or as tools subsurface studies.