Deglacial dysoxic events on 100 to 200 years cycle revealed by high resolution analysis of benthic foraminiferal assemblages in core MD01-2409 collected from off Shimokita Peninsula

Abstract

Abstract: Benthic foraminiferal (BF) assemblages in core MD01-2409 collected from a water depth of 975 m off Shimokita Peninsula were investigated to reconstruct bottom water oxygenation changes around north Japan during the last deglaciation. Abundance changes in dominant taxa indicate centennial changes in dissolved oxygen condition on the seafloor. The BF assemblages were classified into three groups: oxic, suboxic, and dysoxic taxa. The deglacial BF assemblages show dysoxic events on 100−200 year cycle.