Genesis and Nd Isotope Composition of Ferromanganese Deposits of the Sea of Okhotsk and the Kuril Island Arc

P. E. Mikhailik, I. A. Vishnevskaya, E. V. Mikhailik, M. G. Blokhin, M. V. Chervyakovskaya, V. A. Rashidov, X. Ren

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The Nd isotope composition of ferromanganese deposits (FMD) from the central part of the Sea of Okhotsk and the Kuril island arc has been studied. The results showed that diagenetic samples from the Deryugin Basin have a heterogeneous Nd isotope compo-sition. The positive εNd values here might be both due to the input of a terrigenous impurity and due to diffuse endogenetic element supply. The FMD samples from the Sonne underwater ridge show a εNd value specific to seawater (–3.2). The εNd value of hydrogenetic FMD from Volcano 7.14 is –3.4, which corresponds to the εNd value of the Pacific water. The FMD samples from Volcano 5.5 are characterized by εNd = –2.0. The higher εNd value might be due to a moderate dilution of the hydrothermal fluid by seawater and might also indicate the presence of volcanic fragments in the FMD samples. The highest εNd value (+4.4) has been established for volcaniclastic sandstone saturated with Fe and Mn hydroxides. It points to a mixing of volcanomictic and hydrothermal materials.

Translated title of the contributionГенезис и изотопный состав Nd железомарганцевых образований Охотского моря и Курильской островной дуги
Original languageEnglish
Article number8
Pages (from-to)1074-1087
Number of pages14
JournalRussian Geology and Geophysics
Issue number9
Publication statusPublished - Sep 2021


  • Ferromanganese deposits
  • Genesis
  • Kuril island arc
  • Nd isotope composition
  • Sea of Okhotsk


  • 1.05.KY GEOLOGY


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