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

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

doi:10.1007/978-94-007-4762-3_117

Cited by 3 publications

(8 citation statements)

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“…7 and 8). These values are also consistent with the REE patterns (Hori et al, 2007) and iron mineral species (Sato et al, 2012) reported from adjacent cherts in the Kurusu and Katsuyama sections, respectively. Unlike shales deposited during the Norian, high Mn and weak Mo enrichments are observed in the same horizons (Fig.…”

Section: Oxic Conditions Across the Tr-j Boundarysupporting

confidence: 90%

“…In contrast, the intercalated dark gray radiolarian cherts provide evidence for the anoxic events in the pelagic Panthalassic Ocean (Hori, 1993). Many previous studies have reported redox proxies in deep-sea sediments in Japan, such as sulfur isotope ratios (Kajiwara et al, 1994;Takahashi et al, 2013Takahashi et al, , 2015, trace element concentrations and/or rare earth element (REE) abundance patterns (Ishiga et al, 1996;Kato et al, 2002;Hori et al, 2007;Algeo et al, 2011;Takahashi et al, 2014Takahashi et al, , 2015, the size of framboidal pyrite grains (Algeo et al, 2010;Wignall et al, 2010;Takahashi et al, 2015), and variations in ironbearing mineral species (Nakao and Isozaki, 1994;Kubo et al, 1996;Matsuo et al, 2003;Sato et al, 2012). These studies, except for Wignall et al (2010), focused on particular sequences around the Permian-Triassic (P-T) or Tr-J boundaries.…”

Section: Introductionmentioning

confidence: 97%

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Tracking the redox history and nitrogen cycle in the pelagic Panthalassic deep ocean in the Middle Triassic to Early Jurassic: Insights from redox-sensitive elements and nitrogen isotopes

Fujisaki

Sawaki

Yamamoto

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Oxic Conditions Across the Tr-j Boundarysupporting

confidence: 90%

Section: Introductionmentioning

confidence: 97%

Tracking the redox history and nitrogen cycle in the pelagic Panthalassic deep ocean in the Middle Triassic to Early Jurassic: Insights from redox-sensitive elements and nitrogen isotopes

Fujisaki

Sawaki

Yamamoto

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Regardless of their depositional age, most of them display the primary brick-red colour (except for the parts later altered or metamorphosed), which reflects the ubiquitous occurrence of hematite (iron oxide) within almost transparent silica (Fig. 4A, B), as confirmed by X-ray diffraction, rare earth element abundances, and Mössbauer spectroscopy (Isozaki 1994;Kato et al 2002;Matsuo et al 2003;Sato et al 2011. The 160 m.y.-long deposition of mid-oceanic deepsea chert implies a considerably long residence time for the relevant oceanic floor in mid-oceanic realms before arrival at the Jurassic continental margin of Japan.…”

Section: Permo-triassic Boundary Superanoxia and Extinctionmentioning

confidence: 90%

“…4A, B) generally has the following characteristics: 1) Milankovitch-tuned, rhythmically bedded alternation of vitric and argillaceous layers on a centimetre scale; 2) a vitric layer composed of ca. 95 wt.% silica derived from siliceous microfossil tests (radiolaria, sponge spicules); 3) an argillaceous layer composed of fine-grained clay minerals (mostly illite-derived, likely from eolian dust) with a high concentration of cosmic spherules; 4) a brick red colour reflecting the inclusion of hematite (iron oxide); 5) extremely low average sedimentation rate (less than 5 mm/ka); and 6) the top portion changing gradually into hemipelagic siliceous mudstone (Matsuda and Isozaki 1991;Hori et al 1993;Matsuo et al 2003;Ikeda et al 2010;Sato et al 2011). …”

Section: Deep-sea Chertmentioning

confidence: 99%

“…According to the Fe-mineral identification by Mössbauer spectroscopy (Matsuo et al 2003;Sato et al 2011), most of the Phanerozoic deep-sea chert beds share the primary brick-red colour, except for the cases of secondary alteration and peculiar anoxic horizons. Their red colour reflects the dominance of hematite that suggests oxic conditions at the depositional site.…”

Section: Neoproterozoic Snowball Dropstone and Paleo-redox In Mid-oceanmentioning

confidence: 99%

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Memories of Pre-Jurassic Lost Oceans: How To Retrieve Them From Extant Lands

Isozaki

2014

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The information reflected in mid-oceanic sedimentary deposits provides critical constraints for reconstructing past global environmental changes. Available data from extant oceans, however, are limited to the Early Jurassic and younger ages, because older oceanic plates have been subducted. This article explains methods for obtaining information on pre-Jurassic mid-oceanic conditions by conducting fieldwork on older orogenic belts exposed on land. The key point is the identification of ancient accretionary complexes (AC), not along currently active margins but within older orogenic belts in continental domains, particularly by recognizing ocean plate stratigraphy (OPS) that contains mid-oceanic strata, as demonstrated by studies of on-land exposed ancient AC in Japan and elsewhere. In this paper, six examples of retrieved mid-oceanic sedimentary data are introduced, in which significant records on the following unique events in the pre-Jurassic world are archived: 1) the extinction-related Paleozoic–Mesozoic boundary superanoxia (based on data from the Jurassic AC in SW Japan); 2) the Permian Kamura cooling event in the mid-Panthalassa (ditto); 3) the Neoproterozoic snowball Earth evidence from the mid-Iapetus Ocean (based on data from the Neoproterozoic–Cambrian AC in Wales, UK); 4) the discovery of enigmatic Ediacaran (Neoproterozoic) microfossils from a mid-oceanic atoll complex (based on data from the Cambrian AC in southern Siberia, Russia); and 5) and 6) Early Archean (3.8 and 3.5 Ga) biogenic signatures in mid-oceanic deep-sea environments (based on data from the Eoarchean AC at Isua in Greenland, and the Paleoarchean one in Pilbara, Western Australia). These results demonstrate the great utility of OPS analysis for understanding pre-Jurassic lost oceans, including the early biological and environmental evolution of the globe. SOMMAIRELes informations enregistrées dans les dépôts sédimentaires médio-océaniques constituent des contraintes logiques qui permettent de reconstituer les changements environnementaux globaux. Cela dit, l’information sur de grands pans de fonds océaniques est limitée aux fonds océaniques Jurassiques précoces et plus jeunes, parce que les fonds océaniques plus anciens ont été subduits. Le présent article explique des méthodes permettant d’obtenir de l’information sur les milieux médio-océaniques pré-jurassiques par des levés de terrain sur des ceintures orogéniques affleurant sur terre. L’idée centrale consiste à circonscrire d’anciens complexes d’accrétion (AC), hors des marges actives actuelles, soit dans les ceintures orogéniques plus anciennes au sein des domaines continentaux, en y repérant des contextes stratigraphiques de plaques océaniques (OPS) qui renferment des strates médio-océaniques, comme ça a été fait lors études d’AC affleurant au Japon et ailleurs. Le présent document décrit six exemples de contextes stratigraphiques de plaques océaniques où on trouve des indices importants des événements pré-jurassiques uniques suivants : 1) l’extinction liée à la super-anoxie de la limite Paléozoïque-Mésozoïque (à partir des données d’un AC jurassique dans le sud-ouest du Japon); 2) l’épisode de refroidissement permien de Kamura du Panthalassa moyen; 3) l’épisode néoprotérozoïque de « Terre boule de neige » conservé par l’océan mi-japétien (selon les données de l’AC néoprotérozoïque-cambrien dans les Wales au Royaume-Uni); 4) la découverte de microfossiles édiacariens (Néoprotérozoïque) d’un complexe d’atolls médio-océaniques (selon les données d’un AC cambrien du sud-est sibérien, Russie); et 5 et 6) des signatures biogéniques de milieux médio-océaniques profonds de l’Archéen précoce (3,8 et 3,5 Ga) (selon les données d’un AC éoarchéen à Isua au Groenland, et d’un AC paléoarchéen à Pilbara, Australie). Ces résultats montrent la grande utilité de l'analyse de la stratigraphie des plaques océaniques pour comprendre les océans pré-Jurassique, de même que l'évolution des débuts de la vie et des milieux de vie sur Terre.

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REE geochemistry of conodont fossils from pelagic deep-sea sedimentary rocks

Matsumoto,

Takahashi,

Muto

et al. 2023

Geochem. J.

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Conodonts are tooth-like apparatuses of extinct marine animals and their geochemical composition is a key tool in reconstructions of paleo-marine environmental conditions.Previous geochemical studies focused on conodont fossils with weak thermal maturation from shallow-marine sedimentary rocks. However, the geochemical features of conodont fossils in pelagic deep-sea sedimentary rocks, which are suitable for reconstructions of paleo-environmental conditions of pelagic Panthalassa, are poorly understood. This study presents geochemical data of conodont fossils from the Triassic deep-sea pelagic sedimentary rocks from the Inuyama area, central Japan and examines their potential as a paleo-environmental indicator. The examined conodonts were composed of fluorapatite and possessed almost the same major elemental fractions as conodonts from Early Triassic limestone. Concentrations of REEs in conodonts in the pelagic deep-sea sedimentary rocks (~1000 ppm in average) are much higher than that of the conodonts from limestone (~89 ppm in average). Cathodoluminescence images and elemental mapping of conodont cross-sections reveal that conodonts in pelagic deep-sea sedimentary rocks have a few μm-thick REEs-rich layers composed of diagenetically precipitated euhedral apatite at the surfaces of the denticles and along cracks. Furthermore, 4 Y/Ho ratios and Ce anomalies of the conodont fossils are different from those of modern seawater and, instead, are similar to those of the surrounding siliceous sedimentary matrix.These results suggest that their REE signatures were acquired from the surrounding siliceous material during diagenesis. The Ce anomalies of conodonts could reflect the presence of Fe-Mn oxides at the paleo-sea floor and indirectly record the redox condition of paleo-ocean floor.

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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

Cited by 3 publications

References 4 publications

Tracking the redox history and nitrogen cycle in the pelagic Panthalassic deep ocean in the Middle Triassic to Early Jurassic: Insights from redox-sensitive elements and nitrogen isotopes

Tracking the redox history and nitrogen cycle in the pelagic Panthalassic deep ocean in the Middle Triassic to Early Jurassic: Insights from redox-sensitive elements and nitrogen isotopes

Memories of Pre-Jurassic Lost Oceans: How To Retrieve Them From Extant Lands

REE geochemistry of conodont fossils from pelagic deep-sea sedimentary rocks

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