Modern soil aggregates–colluvium generated by overland flow – stratigraphy and physical experiments

• DOI: 10.1111/sed.13116
• Publication Date: 2023-05-13T15:40:12Z
• Authors: Julio Cesar Paisani; Rafael Manica; Marcos Cesar Pere...; Rafaela Ana Rech ...
• Keywords: Colluvium; Infiltration (HVAC)

ABSTRACT In tropical and subtropical zones, sandy colluviums composed of soil aggregates are highly significant for the understanding depositional processes in natural realm. The formation aggregates–colluviums (pedosediments other climate zones) poorly defined. Deeper knowledge on origin from low‐density or high‐density overland flows is essential improved found modern, Quaternary ancient stratigraphic records. has been integrated into this study by combining macrostratigraphy microstratigraphy laboratory experimental techniques. actualism principle was applied using a sedimentological description modern aggregates–colluvium deposit generated flows. addition, physical experiments were performed to simulate sedimentation various sediment concentrations. results indicate maximum grain size (granules pebbles) beds originating high competence involving large volumes local rainfall (storms). Overland responsible laminated aggregates–colluviums; however, laminations heterogeneous sequences compared those flows, which have homogeneous sequences. natural, shows varied structures flow laminations, implying several types density. internal organization laminae suggests that accretion colluvium occurred through low‐transitional density Low‐density less frequent may constitute either single more diluted tail Finally, can generate facies with similar end members mass movements, being distinguished only bed thickness. Linking field observations results, as present study, leads deeper processes, especially zones.