Analysis of the Carbon, Calcium and Silicon concentration of a river bedload sample (LHWS1; <7 µm size fraction) from the Efri Haukadalsa river, Iceland

Electron microprobe microanalysis (EPMA) map of C, Ca, and Si concentrations in a sieved (less than 7 µm) and pelletized sample of river bedload sediment (site LHWS-1). Details on the analysis method and calibration are provided in the associated manuscript.