Genesis of REY-rich deep-sea sediments in the Tiki Basin, eastern South Pacific Ocean: Evidence from geochemistry, mineralogy and isotope systematics

Zhou, Tiancheng; Shi, Xuefa; Huang, Mu; Yu, Miao; Bi, Dongjie; Ren, Xiaomin; Liu, Jihua; Zhu, Aimei; Fang, Xishan; Shi, Meijuan

doi:10.1016/j.oregeorev.2021.104330

Cited by 27 publications

(16 citation statements)

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“…7B ). The wide range of εNd between −12.0 and −1.4 (mean = −6.1) is comparable with previously published εNd data of bioapatite in REY-rich sediment ( 53 , 54 ). These results are significantly different from that of the Pacific Deep Water (−3.5) and the North Pacific Intermediate Water (−3.0) ( 55 ).…”

Section: Discussionsupporting

confidence: 90%

“…Bioapatite εNd values are similar to those of the embedding sediment ( 56 ). The εNd values in REY-rich sediments in the Pacific Ocean show less radiogenic values (~−5.3) ( 53 ) relative to modern seawater ( 55 ). Meanwhile, ferromanganese sediment, a possible source of pore water Nd, displays lower εNd values than seawater ( 53 ).…”

Section: Discussionmentioning

confidence: 99%

“…The εNd values in REY-rich sediments in the Pacific Ocean show less radiogenic values (~−5.3) ( 53 ) relative to modern seawater ( 55 ). Meanwhile, ferromanganese sediment, a possible source of pore water Nd, displays lower εNd values than seawater ( 53 ). A weak negative correlation between εNd and REY occurs in each part of bioapatite fossils ( Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The diagenetic Nd uptake from the pore water ( 56 ) might contribute to the substantial variability in εNd values. In the water column, the εNd values of fish teeth tend to integrate seawater values ( 15 , 27 , 53 ). During postmortem diagenetic REY uptake into bioapatite within a few 10 4 years at the SWI, the εNd values of the root part of fish teeth may be affected ( 56 ) due to a 10 5 -time increase in Nd concentrations ( 7 ).…”

Section: Discussionmentioning

confidence: 99%

“…In situ Nd isotopic analyses followed the method of ( 53 ). An X skimmer cone and a small N 2 (2 ml/liter) flow improved the instrumental sensitivity.…”

Section: Methodsmentioning

confidence: 99%

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Early diagenetic control on the enrichment and fractionation of rare earth elements in deep-sea sediments

et al. 2022

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The rare earth elements and yttrium (REY) in bioapatite from deep-sea sediments are potential proxies for reconstructing paleoenvironmental conditions. However, the REY enrichment mechanism and the reliability of this tracer remain elusive because of the lack of key information from ambient pore water. Here, we report high-resolution geochemical data for pore water, bottom water, and bioapatite from deep-sea sites in the western Pacific. Our results reveal that the benthic flux of REY from the deep sea is less substantial than from the shallow marine realm, resulting in REY-rich sediment. The depth distribution of REY in pore water is opposite to that of bioapatite, and REY patterns and neodymium isotopic compositions are not uniformly distributed within bioapatite. These results indicate alteration of REY and neodymium isotopic compositions during early diagenesis. Therefore, we infer that REY from bioapatite are not robust recorders of the deep marine environment through Earth’s history.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…In situ Nd isotopic analyses followed the method of ( 53 ). An X skimmer cone and a small N 2 (2 ml/liter) flow improved the instrumental sensitivity.…”

Section: Methodsmentioning

confidence: 99%

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