A Mossbauer Study of Oceanic Sediments from Site 612, Deep Sea Drilling Project Leg 95

Minai, Yoshitaka; Nakamura, Yuji; Tominaga, T.

doi:10.2973/dsdp.proc.95.126.1987

“…Similar results were also reported by Thijs et al (1981) based on the Mössbauer spectra of sediments and manganese nodules in the Pacific. Mössbauer characterization was also reported for the sedimentary sequence from a Deep Sea Drilling Project hole (Minai et al, 1987). In this article we report the oxidation states of iron and probable nature of the iron-bearing components in the sediments from Sites 798 and 799, based on the Mössbauer spectra for sediments…”

Section: Introductionmentioning

confidence: 68%

Mössbauer Characterization of Sediments from Sites 798 and 799, Japan Sea

Minai¹,

Kusudo²,

Matsumoto³

et al. 1992

Proceedings of the Ocean Drilling Program

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57 Fe Mössbauer spectra for 26 sediment and 6 carbonate concretion samples from Sites 798 and 799 were recorded at 293 K. Most spectra were deconvolved to two quadrupole doublets without magnetic hyperfine structure. Typical Mössbauer parameters were: isomer shift (I.S.) = 0.34 mm/s and quadrupole splitting (Q.S.) = 0.64 mm/s for the paramagnetic Fe 3+ component (partly, pyrite); I.S. = 1.13 mm/s and Q.S. = 2.64 mm/s for the high-spin Fe 2+ component derived from iron-bearing aluminosilicates. A few spectra included other high-spin Fe 2+ components ascribed to iron-bearing carbonate minerals (e.g., ferroan magnesite), according to the Mössbauer parameters for Fe 2+ in the carbonate concretions. We present the distribution of iron among different chemical forms as a function of depth. These data might indicate changes of depositional and diagenetic conditions.

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“…Similar results were also reported by Thijs et al (1981) based on the Mössbauer spectra of sediments and manganese nodules in the Pacific. Mössbauer characterization was also reported for the sedimentary sequence from a Deep Sea Drilling Project hole (Minai et al, 1987). In this article we report the oxidation states of iron and probable nature of the iron-bearing components in the sediments from Sites 798 and 799, based on the Mössbauer spectra for sediments and carbonate concretions.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer Characterization of Sediments from Sites 798 and 799, Japan Sea

Minai¹,

Kusudo²,

Matsumoto³

et al. 1992

Proceedings of the Ocean Drilling Program

Self Cite

1

0

View full text Add to dashboard Cite

57 Fe Mössbauer spectra for 26 sediment and 6 carbonate concretion samples from Sites 798 and 799 were recorded at 293 K. Most spectra were deconvolved to two quadrupole doublets without magnetic hyperfine structure. Typical Mössbauer parameters were: isomer shift (I.S.) = 0.34 mm/s and quadrupole splitting (Q.S.) = 0.64 mm/s for the paramagnetic Fe 3+ component (partly, pyrite); I.S. = 1.13 mm/s and Q.S. = 2.64 mm/s for the high-spin Fe 2+ component derived from iron-bearing aluminosilicates. A few spectra included other high-spin Fe 2+ components ascribed to iron-bearing carbonate minerals (e.g., ferroan magnesite), according to the Mössbauer parameters for Fe 2+ in the carbonate concretions. We present the distribution of iron among different chemical forms as a function of depth. These data might indicate changes of depositional and diagenetic conditions.

show abstract