57Fe Mössbauer spectroscopic analysis of deep-sea pelagic chert: Effect of secondary alteration with respect to paleo-redox evaluation

Sato, Terukazu; Isozaki, Yukio; Shozugawa, Katsumi; Matsuo, Motoyuki

doi:10.1016/j.jseaes.2011.08.004

Cited by 13 publications

(7 citation statements)

References 19 publications

(44 reference statements)

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“…The greenish-gray cherts (TOA1-5, 37), immediately below and above the reducing interval, contain mainly Fe 2+ (outer) without pyrite nor hematite. They represent altered parts from the primary hematite-bearing cherts, in accordance with a recent study [6]. The onset of the reducing condition in deep-sea is marked by the first appearance of the gray pyrite-bearing chert (TOA6), lying ∼3.5 m below the T-OAE black cherts (TOA30-30.8), at the Hsuum mulleri-Trillus elkhornensis (Radiolaria) Zone [4,5], i.e.…”

Section: Resultssupporting

confidence: 87%

“…without pyrite. The former group with framboidal pyrites was likely deposited primarily under reducing conditions, whereas the latter group without pyrite was likely altered from primary hematite-bearing red cherts [6]. Fe 3+ (h.s.)…”

Section: Resultsmentioning

confidence: 99%

“…The T-J boundary lies in the red cherts, whereas the T-OAE interval lies in organic-rich black cherts above the grayish cherts. Chert samples were prepared following the same procedure as previous studies [2,6]. Mössbauer spectra were measured with an Austin Science S-600 Mössbauer spectrometer using a 1.11 GBq 57 Co/Rh source at room temperature (293 K).…”

Section: Sample and Methodsmentioning

confidence: 99%

“…All doublets were treated as symmetric. Peak positions of pyrite were constrained as in previous studies [2,6]. The presence of pyrite crystals was also checked under the microscope.…”

Section: Sample and Methodsmentioning

confidence: 99%

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57Fe Mössbauer analysis of the Upper Triassic-Lower Jurassic deep-sea chert: Paleo-redox history across the Triassic-Jurassic boundary and the Toarcian oceanic anoxic event

et al. 2011

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We investigated the paleo-redox change across the Triassic-Jurassic (T-J) boundary (∼200 Ma) and the Early Toarcian oceanic anoxic event (T-OAE; ∼183 Ma) recorded in the Upper Triassic to Lower Jurassic pelagic deep-sea cherts in the Inuyama area, Central Japan. The present 57 Fe Mössbauer spectroscopic analysis for these cherts identified five iron species, i.e., hematite (α-Fe 2 O 3 ), pyrite (FeS 2 ), paramagnetic Fe 3+ , and two paramagnetic Fe 2+ with different quadrupole splittings. The occurrence of hematite and pyrite in deep-sea cherts essentially indicates primary oxidizing and reducing depositional conditions, respectively. The results confirmed that oxidizing conditions persisted in deep-sea across the T-J boundary. In contrast, across the T-OAE, deep-sea environment shifted to reducing conditions. The first appearance of the gray pyrite-bearing chert marked the onset of the deep-sea oxygen-depletion in the middle Pliensbachian, i.e., clearly before the shallow-sea T-OAE.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Sample and Methodsmentioning

confidence: 99%

“…All doublets were treated as symmetric. Peak positions of pyrite were constrained as in previous studies [2,6]. The presence of pyrite crystals was also checked under the microscope.…”

Section: Sample and Methodsmentioning

confidence: 99%

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57Fe Mössbauer analysis of the Upper Triassic-Lower Jurassic deep-sea chert: Paleo-redox history across the Triassic-Jurassic boundary and the Toarcian oceanic anoxic event

et al. 2011

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“…The peak number and positions of the absorption spectrum reflect an interaction between the nucleus and the surrounding electrons, providing information on the chemical states of the iron in the sample. The 57 Fe Mössbauer spectroscopic analysis is a useful method for clarifying the chemical states of iron in geological samples, such as deep-sea pelagic chert (Sato et al, 2011), without a sequential wet extraction procedure.…”

Section: Fe Mössbauer Spectroscopic Analysismentioning

confidence: 99%

Isotopic evidence for water-column denitrification and sulfate reduction at the end-Guadalupian (Middle Permian)

Saitoh

Ueno

Isozaki

et al. 2014

Global and Planetary Change

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57Fe Mössbauer analysis of the Upper Triassic-Lower Jurassic deep-sea chert: Paleo-redox history across the Triassic-Jurassic boundary and the Toarcian oceanic anoxic event

Sato¹,

Isozaki²,

Shozugawa³

et al. 2011

Icame 2011

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57Fe Mössbauer spectroscopic analysis of deep-sea pelagic chert: Effect of secondary alteration with respect to paleo-redox evaluation

Cited by 13 publications

References 19 publications

57Fe Mössbauer analysis of the Upper Triassic-Lower Jurassic deep-sea chert: Paleo-redox history across the Triassic-Jurassic boundary and the Toarcian oceanic anoxic event

57Fe Mössbauer analysis of the Upper Triassic-Lower Jurassic deep-sea chert: Paleo-redox history across the Triassic-Jurassic boundary and the Toarcian oceanic anoxic event

Isotopic evidence for water-column denitrification and sulfate reduction at the end-Guadalupian (Middle Permian)

57Fe Mössbauer analysis of the Upper Triassic-Lower Jurassic deep-sea chert: Paleo-redox history across the Triassic-Jurassic boundary and the Toarcian oceanic anoxic event

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