Geochemical Characteristics of Sediment in Tropical Lake Sentani, Indonesia, Are Influenced by Spatial Differences in Catchment Geology and Water Column Stratification

Physical and (bio)chemical processes in the catchment as well internal lake influence composition of lacustrine sediments. Lake are a consequence reactions fluxes between sediment, porewater water column. Due to its separation into four interconnected sub-basins, Sentani, Papua Province, Indonesia, is unique tropical that reveals wide range geochemical conditions. The highly diverse geological causes mineralogical chemical differentiation sediment input each sub-basin. Also, strong morphological differences sub-basins result column structure for sub-basin, ranging from fully mixed meromictic. Given bottom chemistry among Sentani offers chance study multiple systems under identical climate conditions with common surface chemistry. We used cores samples measured physicochemical profiles reveal characteristics column, pore all Sentani. according their structure. Catchment lithology mainly affects overall composition, whereas also affected by structure, which related basin morphology depth. In meromictic appear form single continuous system, those oxygenated sediment-water interface forms pronounced barrier.