Importance of Grain Size Factor in Distribution of Trace Elements in Stream Sediments of Tropical High Grade Terrains – A Case Study from Sri Lanka

Determination of optimum grain size fraction is critical in geochemical exploration of stream sediment. In terrains with various geological, climatological, and geomorphological conditions different size fractions are customarily used. For geochemical exploration in tropical high-grade metamorphic terrains of Sri Lanka stream sediment samples collected from 6 river basins representing different geological, geomorphological, hydrological, and climatic conditions were studied. Four selected grain size fractions,