Enrichment and sources of REY in phosphate fractions: Constraints from the leaching of REY-rich deep-sea sediments

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

“…This study reports that the long‐term evolution of the depositional environment has been recorded in the multielemental geochemistry of pelagic clay and multivariate statistical techniques can serve as a promising tool for systematically deriving information from apparently uniform/massive clay facies. For seafloor mineral resource explorations, high‐dimensional geochemical data of pelagic clay enriched in REE called “REE‐rich mud” (Kato et al., 2011; Nakamura et al., 2015) and its constituents have been reported from oceans in recent years (Bi et al., 2021; Deng et al., 2022; Liao, Sun, Li, et al., 2019; Liao, Sun, Wu, et al., 2019; Liao et al., 2022; Menendez et al., 2017; Ren et al., 2022; Sa et al., 2018; Zhang et al., 2017; T. Zhou et al., 2020, 2021). The application of systematic statistical approaches to such a new, unexplored data stack of pelagic clay would provide incredible information on the geological history and/or critical metal‐ore genesis in the pelagic realm dominated by barren clay facies.…”

“…In recent years, pelagic clay in the Pacific Ocean have received special attention because they concentrate industrially critical rare‐earth elements (REE), especially heavy REE and Sc, potentially on a commercial scale (Fujinaga et al., 2016; Iijima et al., 2016; Kato et al., 2011; Liao, Sun, Li, et al., 2019; Liao, Sun, Wu, et al., 2019; Liao et al., 2022; Nakamura et al., 2015; Ohta et al., 2020, 2021; Ren et al., 2022; Sa et al., 2018; Takaya et al., 2018; Yasukawa et al., 2018; T. Zhou et al., 2020, 2021). Tanaka et al.…”

Controlling Factors on REY Enrichments in Basins From the Pacific Ocean: Early Diagenesis and Local Constraints

“…According to previous source-tracing studies on geological records from the North Pacific regions (e.g., Rea et al, 1998;Uno et al, 2009;Zhong et al, 2022), the reversed correlations between Fe, Mn, and REY shown by the WP sediment cores might be related to the Asian dust input. Our XRD mineral characterizations reveal the occurrences of (Iijima et al, 2016;Ren et al, 2022). The classification criterion of REY-rich sediments refers to Iijima et al (2016).…”

“…The evidence supports the eolian dust input from the continent to the Pacific Ocean, but the different trends of Fe versus REY between WP and CNP cores might be attributed to their different distances from the continent (Figure 1). Ren et al (2022) used a chemical leaching method to separate the phosphate and non-phosphate fractions of the REY-rich sediments from the Western Pacific Pigafetta Basin. They found that the Sr-Nd isotopic compositions of the two fractions all display strong terrigenous signals, which agrees with the bulk Sr isotopic data of sediments collected near the Minamitorishima Island (Tanaka et al, 2022).…”

“…Representative scatter diagrams of the chemical compositions of the WP, CNP, and ESP sediments. The samples from the WP regions are inserted for comparison(Iijima et al, 2016;Ren et al, 2022). The classification criterion of REY-rich sediments refers toIijima et al (2016).…”