REE and Trace Elements Distribution in the Deep-sea Sediments from the Interoceanmetal (IOM) Polymetallic Nodule Exploration Area in the Clarion-Clipperton Fractures Zone, NE Pacific

Authors

  • Atanas Hikov Geological Institute, Bulgarian Academy of Sciences
  • Zlatka Milakovska Geological Institute, Bulgarian Academy of Sciences
  • Valcana Stoyanova Interoceanmetal Joint Organization, Poland
  • Elitsa Stefanova Geological Institute, Bulgarian Academy of Sciences
  • Tomasz Abramowski Interoceanmetal Joint Organization and Maritime University of Szczecin, Poland
  • Silvia Chavdarova Geological Institute, Bulgarian Academy of Sciences
  • Milen Stavrev Geological Institute, Bulgarian Academy of Sciences

DOI:

https://doi.org/10.7546/CRABS.2022.07.10

Keywords:

deep-sea sediments, polymetallic nodules, geochemistry, REE, Interoceanmetal, Clarion-Clipperton Fractures zone

Abstract

Geochemical features of the deep-sea sediments from a high polymetallic nodule area in the eastern part of the Clarion-Clipperton Fractures Zone (CCZ), NE Pacific were studied. Box-corer samples from six stations in individual depth layers 0–3, 3–5, 5–10, 10–20 cm were collected from 4300–4500 m depth. The deep-sea sediments were classified as clayey-siliceous oozes according to the mineral and grain-size analyses. The chemical composition of the studied samples is compatible with that of pelagic sediments. Manganese content varies from 0.16% to 0.70% being the highest in the geochemically active layer (top 7–12 cm) and decreases with depth. The Mn/Fe ratio, Ba, Co, Ni and Cu have the highest values in the first (0–3) and second (3–5) layers and decrease with depth. REE range is 195.84–357.79 ppm showing low variation between the layers. PAAS-normalized REE patterns show significant enrichment of MREE and HREE with strong negative Ce anomaly and weak positive Eu and Y anomalies. The geochemical characteristics of the studied sediments infer polygenic origin. The redox sensitive oxides and barite presense, Eh values and negative Ce anomaly, indicate oxidizing environment of sediment formation. 

Author Biographies

Atanas Hikov, Geological Institute, Bulgarian Academy of Sciences

Mailing Address:
Geological Institute,
Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 24
1113 Sofia, Bulgaria

E-mail: ahikov@geology.bas.bg

Zlatka Milakovska, Geological Institute, Bulgarian Academy of Sciences

Mailing Address:
Geological Institute,
Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 24
1113 Sofia, Bulgaria

E-mail: zlatkam@geology.bas.bg

Valcana Stoyanova, Interoceanmetal Joint Organization, Poland

Mailing Address:
Interoceanmetal Joint Organization
9 Cyryla I Metodego St
71541 Szczecin, Poland

E-mail: v.stoyanova@iom.gov.pl

Elitsa Stefanova, Geological Institute, Bulgarian Academy of Sciences

Mailing Address:
Geological Institute,
Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 24
1113 Sofia, Bulgaria

E-mail: stefanova_e@geology.bas.bg

Tomasz Abramowski, Interoceanmetal Joint Organization and Maritime University of Szczecin, Poland

Mailing Address:
Interoceanmetal Joint Organization
9 Cyryla I Metodego St
71541 Szczecin, Poland

and

Maritime University of Szczecin
71541 Szczecin, Poland

E-mail: t.abramowski@iom.gov.pl,
t.abramowski@am.szczecin.pl

Silvia Chavdarova, Geological Institute, Bulgarian Academy of Sciences

Mailing Address:
Geological Institute,
Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 24
1113 Sofia, Bulgaria

E-mail: silvia.chavdarova@gmail.com

Milen Stavrev, Geological Institute, Bulgarian Academy of Sciences

Mailing Address:
Geological Institute,
Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 24
1113 Sofia, Bulgaria

E-mail: milen_stavrev07@abv.bg

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Published

29-07-2022

How to Cite

[1]
A. Hikov, “REE and Trace Elements Distribution in the Deep-sea Sediments from the Interoceanmetal (IOM) Polymetallic Nodule Exploration Area in the Clarion-Clipperton Fractures Zone, NE Pacific”, C. R. Acad. Bulg. Sci. , vol. 75, no. 7, pp. 1018–1027, Jul. 2022.

Issue

Section

Geology