High‐Dimensional Chemostratigraphy of Pelagic Clay in the Western North Pacific Ocean Revealed via an Unsupervised Clustering Approach

Abstract

Deep-sea sediments are invaluable recording media for paleoclimatic and paleoceanographic signatures. A recent study utilizing a machine learning (ML) technique updated the distribution of sediment types (Dutkiewicz et al., 2015) and statistically clarified that more than 50% of the deep-sea basin of the Pacific Ocean is occupied by clay. Owing to their extremely low sedimentation rates, pelagic clay in deep-sea sediment columns can

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“…10.1029/2023EA003122 third of the global ocean (Dutkiewicz et al, 2015) and has huge variation in bulk geochemistry (Dunlea et al, 2015;Mimura et al, 2019). Therefore, pelagic clay is a good recorder of long-term and global/regional environmental changes (Kyte et al, 1993;Tanaka et al, 2022;Yasukawa et al, 2023;Zhou & Kyte, 1992). Moreover, pelagic clay is also attracting attention as a promising resource for rare-earth elements (Kato et al, 2011;Ren et al, 2021;Takaya et al, 2018;Yasukawa et al, 2014).…”