Geochemical signatures of hydrothermal sediments on the ultraslow-spreading Gakkel Ridge, Arctic Ocean

Wensheng XUE; Yejian WANG; Zhongyan QIU; Chi YANG; Chunguo YANG; Xinyu MA; Tao ZHANG

doi:10.1007/s00343-025-5112-2

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Geochemical signatures of hydrothermal sediments on the ultraslow-spreading Gakkel Ridge, Arctic Ocean

Geology | Updated：2026-05-07

- Geochemical signatures of hydrothermal sediments on the ultraslow-spreading Gakkel Ridge, Arctic Ocean
- Journal of Oceanology and Limnology Vol. 44, Issue 2, Pages: 603-615(2026)
- Affiliations：
  
  State Key Laboratory of Submarine Geoscience, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
- Author bio：
  
  yjwang@sio.org.cn
- Funds：
- DOI：10.1007/s00343-025-5112-2
  CLC：
- Received：08 April 2025，
  
  Accepted：28 May 2025，
  
  Online First：16 June 2025，
  
  Published：01 March 2026
- Accepted：
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XUE Wensheng,WANG Yejian,QIU Zhongyan,et al.Geochemical signatures of hydrothermal sediments on the ultraslow-spreading Gakkel Ridge, Arctic Ocean[J].Journal of Oceanology and Limnology,2026,44(02):603-615.
DOI：

XUE Wensheng,WANG Yejian,QIU Zhongyan,et al.Geochemical signatures of hydrothermal sediments on the ultraslow-spreading Gakkel Ridge, Arctic Ocean[J].Journal of Oceanology and Limnology,2026,44(02):603-615. DOI： 10.1007/s00343-025-5112-2.

摘要

Abstract

More than 721 submarine hydrothermal fields have been documented globally

however

the characterization of hydrothermal systems beneath the ice-covered Arctic Ocean remains poorly constrained. During the 2021 JASMInE expedition

a 369-cm-long sediment core was recovered from the central rift valley of the Gakkel Ridge 96°E. The core is predominantly composed of terrigenous debris

Fe-(oxyhydr)oxides

volcanic glass

and hydrogenetic Mn oxides. Three hydrothermal-affected layers (HA1–HA3) within the upper 85 centimeters below seafloor (cmbsf) exhibit enrichment in Fe

and Na

associated with accumulation of Fe-(oxyhydr)oxides and volcanic glass. Among these

Layer HA2 (13–16 centimeters below seafloor (cmbsf)) displays the most intense hydrothermal signature

characterized by high concentrations of Fe (12.06–15.22 wt.%)

Mn (2 687–5 465 μg/g)

Cu (245–373 μg/g)

and Pb (248–342 μg/g)

accompanied by reduced rare earth element (REE) concentrations

and shale-normalized patterns featuring negative Ce anomalies

and positive Eu anomalies. In comparison

Layers HA1 (83–85 cmbsf) and HA3 (6–7 cmbsf) exhibit only marginally elevated concentrations of hydrothermal-related elements (Fe

V) compared to pelagic background sediments

indicating a weaker hydrothermal influence. Overall

the observed coarsening of volcanic glass grain size and its increased abundance within hydrothermal-affected layers

coupled with diagnostic signatures from the Al-Fe-Mg ternary diagram and the detection of hydrothermal plume anomalies along the 100°E Axial Volcanic Ridge (AVR)

collectively point to a basalt-hosted hydrothermal system associated with the AVR as the source of the hydrothermal signals recorded in the core. These findings reveal the geochemical fingerprints of hydrothermal materials in Arctic deep-sea sediments

offering new insights into their sources and formation processes in the ice-covered ocean.

关键词

Keywords

references

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