Ferromanganese nodules of the Baltic Sea: Composition, helium isotopes, and growth rate

Anufriev, G. S.; Boltenkov, B. S.

doi:10.1134/s0024490207030030

Cited by 10 publications

(7 citation statements)

References 7 publications

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“…The 40 Ar concentrations of the SCS nodules are lower than those of the Pacific CCFZ nodules but similar to nodules from the Mariana Trough and Ogasawara region [41]. As the shallow-water nodules, 4 He and 3 He concentrations of the SCS nodules are significantly lower than those of the nodules from the Baltic Sea, while the R/R A values of the former are higher than the later [65]. These characteristics suggest significant noble gases source differences (of the Fe-Mn crusts/nodules) between the South China Sea and the other regions.…”

Section: Comparison Of the He And Ar Isotope Characteristics With Deementioning

confidence: 61%

“…The 4 He contents of the SCS crusts are not very different from their Pacific counterparts. 4 He contents of the SCS nodules are much lower than those of the nodules from the Mariana Trough, Ogasawara region [41] and the Baltic sea [65], while are similar to the Pacific CCFZ nodules. The relatively low 3 He/ 4 He ratios in the SCS samples are likely caused by terrigenous detrital input with high radiogenic 4 He contents.…”

Section: Atmospheric/seawater Sourcementioning

confidence: 69%

“…For comparison, the Table 2 also shows the data of the Fe-Mn crusts and nodules from the Pacific Ocean and the Baltic Sea, respectively, The He and Ar of the SCS Fe-Mn crusts/nodules are different from those of the Fe-Mn crusts [46,47,49] and nodules [33,41,65] from the other regions, respectively. Generally, the 4 He contents of the SCS crusts are similar to those of the Pacific non-phosphatized crusts.…”

Section: Comparison Of the He And Ar Isotope Characteristics With Deementioning

confidence: 99%

“…The He and Ar isotope composition of each type of aqueous fluid has distinct characteristics. Hence, we collected and screened a database (published data [33,43,45,[47][48][49][50]65] and this paper) and eventually focused on 75 analyses of noble gas compositions in marine Fe-Mn crusts and nodules. In the 3 He/ 4 He versus 40 Ar/ 36 Ar and 4 He versus R/R A bivariate diagrams (Figure 4), the different types of marine Fe-Mn precipitates differ significantly from each other, which is caused by the differences of the noble gases source and genetic mechanism of the crusts and nodules.…”

Section: Petrogenetic Significance For the Scs Crusts And Nodulesmentioning

confidence: 99%

“…Thus, the characteristics of He and Ar isotope compositions of the SCS crusts/nodules resemble the properties of hydrogenetic Fe-Mn oxide/hydroxide precipitates, which reflects mainly the product of an equilibrium mixture between air-saturated seawater and radiogenic components. 40 Ar/ 36 Ar (A) and 4 He concentration vs R/RA (B) of Fe-Mn crusts and nodules from the South China Sea and Pacific Ocean (SCS crusts and nodules data from this study; Baltic Sea nodules data from [65]; Pacific nodules data from [33,43,45]; Pacific crusts data from [43,[47][48][49][50]).…”

Section: Petrogenetic Significance For the Scs Crusts And Nodulesmentioning

confidence: 99%

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Helium and Argon Isotopes in the Fe-Mn Polymetallic Crusts and Nodules from the South China Sea: Constraints on Their Genetic Sources and Origins

et al. 2018

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In this study, the He and Ar isotope compositions were measured for the Fe-Mn polymetallic crusts and nodules from the South China Sea (SCS), using the high temperature bulk melting method and noble gases isotope mass spectrometry. The He and Ar of the SCS crusts/nodules exist mainly in the Fe-Mn mineral crystal lattice and terrigenous clastic mineral particles. The results show that the 3 He concentrations and R/R A values of the SCS crusts are generally higher than those of the SCS nodules, while 4 He and 40 Ar concentrations of the SCS crusts are lower than those of the SCS nodules. Comparison with the Pacific crusts and nodules, the SCS Fe-Mn crusts/nodules have lower 3 He concentrations and 3 He/ 4 He ratios (R/R A , 0.19 to 1.08) than those of the Pacific Fe-Mn crusts/nodules, while the 40 Ar/ 36 Ar ratios of the SCS samples are significantly higher than those of the Pacific counterparts. The relatively low 3 He/ 4 He ratios and high 40 Ar concentrations in the SCS samples are likely caused by terrigenous detrital input with high radiogenic 4 He and 40 Ar contents. The SCS crusts and nodules have shorter growth periods, implying that in situ post-formation radiogenic 3 He, 4 He and 40 Ar produced by decay of U, Th and K have no effect on their isotope compositions. Thus, the SCS crusts/nodules inherited the noble gases characteristics of their sources. Helium and Ar isotope compositions in the SCS Fe-Mn crusts and nodules reflect the product of an equilibrium mixture between air-saturated seawater and radiogenic components during their growth, while the partial 3 He excess in some SCS samples may represent a little mantle-derived origin. The different He and Ar isotope compositions of the Fe-Mn crusts and nodules between the South China Sea and the Pacific Ocean are due to their different sources and genetic processes. The characteristics of He and Ar isotope compositions in the SCS polymetallic crusts and nodules are similar to the properties of hydrogenetic Fe-Mn oxide/hydroxide precipitates, which reflects mainly the product of an equilibrium mixture between air-saturated seawater and radiogenic components.isotopes provide important geological information for the research of modern ocean circulation, paleoceanography, seafloor hydrothermal and cold brine system and ocean/atmosphere gas exchange.Early studies of marine noble gases are mainly concentrated in solving geochemical problems, such as tracing the excess He in the seawater, which is likely produced by U-Th series radioactive decay in the marine sediments [1,2]. After the discovery of mantle-originated helium [3] and 3 He originated near the sediment surface (via 3 H decay in the sea) [4], people began to use noble gases to trace the source of submarine hydrothermal fluids, crust/mantle material cycle, constrain the formation process and thermodynamic mechanism of seamount systems [5][6][7][8][9][10][11] and to explore the formation and cycle of the ocean currents (e.g., [12][13][14]).Some studies have explored potential application of He isotopes...

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Section: Comparison Of the He And Ar Isotope Characteristics With Deementioning

confidence: 61%

Section: Atmospheric/seawater Sourcementioning

confidence: 69%

Section: Comparison Of the He And Ar Isotope Characteristics With Deementioning

confidence: 99%

Section: Petrogenetic Significance For the Scs Crusts And Nodulesmentioning

confidence: 99%

Section: Petrogenetic Significance For the Scs Crusts And Nodulesmentioning

confidence: 99%

See 3 more Smart Citations

Helium and Argon Isotopes in the Fe-Mn Polymetallic Crusts and Nodules from the South China Sea: Constraints on Their Genetic Sources and Origins

et al. 2018

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Molecular Biomineralization: Toward an Understanding of the Biogenic Origin of Polymetallic Nodules, Seamount Crusts, and Hydrothermal Vents

Wang

Wiens

Schröder

et al. 2011

Molecular Biomineralization

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Polymetallic nodules and crusts, hydrothermal vents from the Deep Sea are economically interesting, since they contain alloying components, e.g., manganese or cobalt, that are used in the production of special steels; in addition, they contain rare metals applied for plasma screens, for magnets in hard disks, or in hybrid car motors. While hydrothermal vents can regenerate in weeks, polymetallic nodules and seamount crusts grow slowly. Even though the geochemical basis for the growth of the nodules and crusts has been well studied, the contribution of microorganisms to the formation of these minerals remained obscure. Recent HR-SEM (high-resolution scanning electron microscopy) analyses of nodules and crusts support their biogenic origin. Within the nodules, bacteria with surface S-layers are arranged on biofilm-like structures, around which Mn deposition starts. In crusts, coccoliths represent the dominant biologically formed structures that act as bio-seeds for an initial Mn deposition. In contrast, hydrothermal vents have apparently an abiogenic origin; however, their minerals are biogenically transformed by bacteria. In turn, strategies can now be developed for biotechnological enrichment as well as selective dissolution of metals from such concretions. We are convinced that the recent discoveries will considerably contribute to our understanding of the participation of organic matrices in the enrichment of those metals and will provide the basis for feasibility studies for biotechnological applications.

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Iron–manganese concretions contribute to benthic release of phosphorus and arsenic in anoxic conditions in the Baltic Sea

et al. 2016

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Ferromanganese nodules of the Baltic Sea: Composition, helium isotopes, and growth rate

Cited by 10 publications

References 7 publications

Helium and Argon Isotopes in the Fe-Mn Polymetallic Crusts and Nodules from the South China Sea: Constraints on Their Genetic Sources and Origins

Helium and Argon Isotopes in the Fe-Mn Polymetallic Crusts and Nodules from the South China Sea: Constraints on Their Genetic Sources and Origins

Molecular Biomineralization: Toward an Understanding of the Biogenic Origin of Polymetallic Nodules, Seamount Crusts, and Hydrothermal Vents

Iron–manganese concretions contribute to benthic release of phosphorus and arsenic in anoxic conditions in the Baltic Sea

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