Significado paleoambiental dos arquivos fluviais na Bacia do Córrego da Contagem, Serra do Espinhaço Meridional (MG)

Watersheds constitute fundamental units for the integrated analysis of geomorphological and hydrological processes, especially in mountainous regions, where structural control and high flow energy strongly condition the organization of fluvial systems. In the Serra do Espinhaço Meridional, these processes result in a high diversity of fluvial landforms and erosion and sedimentation patterns, still poorly investigated in small catchments. In this context, this study aimed to analyze the geomorphological and hydrogeomorphological dynamics of the Córrego da Contagem watershed (Minas Gerais, Brazil), with emphasis on morphometric characterization, identification of fluvial depositional levels and evaluation of organic matter in fluvial deposits. The methodology included a literature review, morphometric analysis, geomorphological mapping, field surveys and laboratory analyses of total organic carbon. The results indicate a watershed under strong structural control, with predominantly straight channels, low sinuosity indices, predominance of vertical incision and high fluvial energy. Two depositional levels were identified in the upper course and one terrace and a floodplain in the middle/lower course, highlighting the influence of local base levels on the longitudinal organization of the valley. Morphometric parameters also reveal a moderately rugged relief, with strong altimetric compartmentalization and significant potential for erosive processes. Higher accumulation of organic matter was observed in the most recent fluvial deposits, associated with lower-energy environments and greater geomorphological stability. It is concluded that the fluvial deposits of the watershed consistently record the recent environmental evolution of the Serra do Espinhaço Meridional.