Highly positive Ce anomalies of hydrogenetic ferromanganese micronodules from abyssal basins in the NW and NE Pacific: Implications for REY migration and enrichment in deep-sea sediments

Zhang, Huan; Zhou, Junming; Yuan, Peng; Dong, Yanhui; Fan, Wenxiao; Chu, Fengyou; Xiao, Wansheng; Liu, Dong

doi:10.1016/j.oregeorev.2023.105324

Cited by 16 publications

(11 citation statements)

References 42 publications

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“…Recent studies suggest that the REY immigration from Fe‐Mn (oxyhydr)oxides to Ca‐phosphate might occur during diagenesis by comparing ferromanganese nodules, crusts, and micronodules from different burial depths (Liao, Sun, Wu, et al., 2019; Zhang et al., 2023). So far, the REY redistribution in pelagic sediments remains enigmatic.…”

Section: Discussionmentioning

confidence: 99%

“…Owing to the complex diagenesis (e.g., Canfield & Thamdrup, 2009), the fates of Ca‐phosphate and Fe‐Mn (oxyhydr)oxides within pelagic sediment columns remain debatable. Recent studies suggested that Fe‐Mn (oxyhydr)oxides may recrystallize and/or be reductively dissolved to release their adsorbed REY during the process of diagenesis (Deng et al., 2022; Kashiwabara et al., 2018; Liao, Sun, Wu, et al., 2019; Takahashi et al., 2015; Wegorzewski et al., 2020; Zhang et al., 2023). As a comparison, Ca‐phosphate can be well preserved and likely achieve REY enrichment by accumulating the liberated REY from Fe‐Mn (oxyhydr)oxides leading to extremely high REY contents (German et al., 1990; Kashiwabara et al., 2018; Liao, Sun, Wu, et al., 2019; Yu et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

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

Liao,

Chen,

Sun

et al. 2024

Geochem Geophys Geosyst

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Increasing interest in high‐tech metals (e.g., rare earth elements and yttrium, REY) has triggered extensive research on the enrichment of these metals in pelagic sediments. In the sediments collected worldwide, Ca‐phosphate and Fe‐Mn (oxyhydr)oxides are targeted as the two most important REY carriers based on multiple geochemical and mineralogical analyses. However, the formation of the REY‐rich stratum remains enigmatic as the influences of diagenesis and the local restrictions of different oceanic basins are complex, which require further investigation. In our study, we analyzed four sediment cores from the Western, Central North, and Eastern South Pacific (WP, CNP, and ESP), which are three of the most promising REY‐rich regions in global oceans. Sequential leaching quantifies the dominance of Ca‐phosphate by controlling ∼73.9%–93.3% of ΣREY and the secondary role of Fe‐Mn (oxyhydr)oxides by holding up to ∼97.8% of Ce and ∼4.82%–13.9% of ΣREY. The shallowly and deeply buried sediments show similar features regarding the REY proportions hosted by different phases, which indicates that the REY accumulation by Ca‐phosphate might majorly occur on the seawater‐sediment interface. The geochemistry of the studied sediment cores reveals that (a) REY enrichment in ESP is affected by hydrothermal Fe‐Mn (oxyhydr)oxides which can promote adsorptions of P and REY. (b) The Fe and Mn contents in WP sediments show an inverse relationship against REY enrichment which might be explained by the dust input from Central Asia. (c) The slow sedimentation rate of CNP enables the extraordinary REY‐uptake by Ca‐phosphate, but the low flux of phosphorus constrains the formation of high‐grade REY deposits.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Liao,

Chen,

Sun

et al. 2024

Geochem Geophys Geosyst

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“…Due to the low content of REY in fresh bioapatite, REY is believed to enter apatite during diagenesis. Fe‐Mn (oxyhydr)oxides/micronodules are considered potential sources of REY in fish teeth due to their ability to scavenge REY from seawater (Liao, Sun, Li, et al., 2019; Liao, Sun, Wu, et al., 2019; Zhang et al., 2023). As discussed earlier, authigenic smectite can be formed by reacting FeOOH with amorphous silicon.…”

Section: Discussionmentioning

confidence: 99%

Enrichment of Smectite in the REY‐Rich Mud of the Clarion‐Clipperton Fracture Zone in the Eastern Pacific and Its Geological Significance

Xiang,

Dong,

Han

et al. 2024

Geochem Geophys Geosyst

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REY‐rich mud, consisting of deep‐sea sediments with high concentrations of rare‐earth elements and yttrium (REY), holds significant economic potential. Many studies have been conducted on biogenic apatite, ferromanganese micronodule, and phillipsite within these deposits to ascertain the REY enrichment mechanisms. However, the knowledge of clay minerals in REY‐rich mud, which is the predominant component of pelagic sediments, is still limited. In this study, two adjacent gravity cores (core GC02: REY‐rich mud; core GC03: typical sediments of equatorial Pacific) were collected from the Clarion‐Clipperton Fracture Zone (CCFZ) of the Eastern Pacific to study the role of different clay minerals in REY enrichment. The clay minerals in core GC03 and core GC02 are primarily illite (averaging 60%) and smectite (averaging 63%), respectively, and the smectite in core GC02 was mainly Fe‐rich, which was probably formed via the reaction between opal and FeOOH. Moreover, multiple studies have reported similar smectite enrichment in REY‐rich mud, suggesting that it is a common characteristic. The presumed hydrothermal or volcanic origination of smectite in REY‐rich layers of core GC02 indicates the essential role of hydrothermal and volcanic activities in REY‐rich mud formation during the Oligocene in the western CCFZ.

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“…The REY partitioning curves of these samples are relatively flat, with very weak positive Y anomalies and insignificant Ce and Eu anomalies, and their REY partitioning patterns are similar to those of Asian dust [53][54][55][56][57][58] and non-REY-rich sediments (250 ppm < ΣREY < 400 ppm) near Minamitorishima Island [6,16,17]. In addition, the Class I REY curves are somewhat similar to those of the micronodules, which usually present obvious positive Ce anomalies [6,59,60], but the ΣREY and Ce anomaly values of Class I are significantly lower than that of micronodules (Figure 3). So, we suppose that the REY in this class mainly originated from the input of Asian dust, with a small contribution from micronodules, bioapatite fossils and other components (as indicated by the existence of micronodules, bioapatite fossils in coarse component, Table 1 and Figure 2).…”

Section: Sources and Carriers Of Reymentioning

confidence: 97%

“…Previous studies have generally concluded that bioapatite fossils, represented by fish teeth, are the primary and ultimate host for REY, and that Fe-Mn oxides/hydroxide, represented by micronodules, are temporary "sinks" for REY [19,[59][60][61][62][63]. During the early stages of sedimentation, sediments mainly rely on Fe-Mn oxides for REY uptake, but during early diagenesis, REY migrate between bioapatite fossils and Fe-Mn oxides [8,[59][60][61][62][63], and REY (except Ce) in hydrogenic micronodules are more easily transported into bioapatite fossils [62][63][64]. Compared with the Class I and III sediments, which do not have high REY contents, the REY-rich sediments (Class II) have higher contents of P 2 O 5 , MnO, Fe 2 O 3 , rock fragments, authigenic minerals, fish teeth, and sand.…”

Section: Sources and Carriers Of Reymentioning

confidence: 99%

The Influence of Seamounts on the Enrichment of Rare Earth Elements in Sediments—A Case Study of the Marcus-Wake Seamounts in the Western Pacific Ocean

Xiao,

Xu,

Deng

et al. 2024

JMSE

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Deep-sea sediments enriched in rare earth elements and yttrium (REY-rich sediments) are widely distributed on the deep-sea floor, and their formation mechanism remains elusive. Although studies have recognized the link between seamounts and REY-rich sediments, in-depth analysis of the specific roles and effects of seamounts in the formation of REY-rich sediments is lacking. In this study, we analyzed surface sediments from the Marcus-Wake Seamounts for grain size, geochemistry, and mineral composition and classified the samples into three types: samples with moderate REY content and dominated by terrestrial detritus; samples with high REY and authigenic mineral content; and samples rich in CaCO3 but poor in REY. The REY in the sediments of the study area partly originate from Asian dust input and partly from seawater and/or pore water, and are mainly enriched in REY carrier particles including bioapatite fossils and micronodules. The amount of REY carrier particles influences the REY content in the sediments. The current field, primary productivity, weathering process, and depositional environment around seamounts are different from those of abyssal plains, which are conducive to the formation of REY-rich sediments. Strong bottom currents may exist in the southeastern direction of some large seamounts (e.g., Niulang Guyot), leading to the selective accumulation of REY-rich bioapatite fossils and micronodules, resulting in the formation of REY-rich sediments.

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Highly positive Ce anomalies of hydrogenetic ferromanganese micronodules from abyssal basins in the NW and NE Pacific: Implications for REY migration and enrichment in deep-sea sediments

Cited by 16 publications

References 42 publications

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

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

Enrichment of Smectite in the REY‐Rich Mud of the Clarion‐Clipperton Fracture Zone in the Eastern Pacific and Its Geological Significance

The Influence of Seamounts on the Enrichment of Rare Earth Elements in Sediments—A Case Study of the Marcus-Wake Seamounts in the Western Pacific Ocean

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