Abstract Ninety-seven mineral analyses (for the total 0.05-0.1 mm fraction and its heavy subfraction) are given of Late Pleistocene to Holocene sediments from the northwestern (subarctic) Pacific, including the Kuril and Aleutian Trenches and Bering Sea. Heavy mineral assemblages indicating ice-rafted debris and its main provenance were defined. The assemblages are derived mainly from the northeastern Bering Sea shelf where large-scale generation of sea-ice is presumed. Temporal and spatial changes of the mineral suites also suggest intermediate to deep water flow along the eastern flank of the Emperor chain during glaciation. The flow might penetrate the Northwest Pacific Basin to the south of 45°N. It was traced by the fine- and medium-grained terrigenous debris in a core from 38°N and 165°E.