Redox condition and nitrogen cycle in the Permian deep mid-ocean: A possible contrast between Panthalassa and Tethys

Fujisaki, Wataru; Sawaki, Yusuke; Matsui, Yohei; Yamamoto, Shinji; Isozaki, Yukio; Maruyama, Shigenori

doi:10.1016/j.gloplacha.2018.09.015

Cited by 17 publications

(19 citation statements)

References 67 publications

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“…In addition to the redox-sensitive elements mentioned above, the Ce anomaly is also a common tracer for redox conditions in pelagic sediments (Kato et al, 2002;Takahashi et al, 2014;Fujisaki et al, 2019). Our data reveal that low Ce/Ce* values are associated with increased MREE (Figure 13), and there is no Ce anomaly when the REE patterns are relatively flat in the studied section (Figures 8, 10).…”

Section: Redox-sensitive Elementsmentioning

confidence: 52%

“…Based on the geochemical interpretations of redox-sensitive elements and principal components from the Iwaidani section, we discuss the redox history of the Guadalupian-Lopingian deepsea Panthalassa, and compare our results with the PTB section at Gujo-Hachiman, where deep-sea oxic-dominated conditions have been proposed for the same period (Wignall et al, 2010;Fujisaki et al, 2019). We also investigate the environmental changes that affected the oceanic redox conditions using the results from our PCA.…”

Section: Discussionmentioning

confidence: 98%

“…The intensification of oxygendepleted conditions during the latest Lopingian has been reported from several PTB sections in the Mino Belt (Wignall et al, 2010;Algeo et al, 2011b;Sano et al, 2012b;Onoue et al, 2019). An improved understanding of the oceanic redox conditions during the Guadalupian and Lopingian (Kato et al, 2002;Kakuwa, 2008;Kato and Isozaki, 2009;Fujisaki et al, 2019) is central to understanding the link between global-ocean conditions and the EPME, as well as the subsequent delayed biotic recovery during the Early Triassic.…”

Section: Introductionmentioning

confidence: 90%

“…7 myr prior to the PTB, on the basis of lithostratigraphic, petrographic, and mineralogical data from the PTB sections in Japan and western Canada. However, recent studies have argued against this hypothesis (Wignall et al, 2010;Fujisaki et al, 2019). For example, the contents of redox-sensitive trace-metals (e.g., U, Mo, and V) and quantitative analysis of framboidal pyrite size distribution from a PTB section at Gujo-Hachiman in Japan (Figure 1) show that the Lopingian deep-sea was dominated by oxic conditions, but that the oxygen minimum zone (OMZ) rapidly expanded at shallower depths in the mid-Panthalassa immediately before the EPME (Algeo et al, , 2011bWignall et al, 2010;Fujisaki et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…However, recent studies have argued against this hypothesis (Wignall et al, 2010;Fujisaki et al, 2019). For example, the contents of redox-sensitive trace-metals (e.g., U, Mo, and V) and quantitative analysis of framboidal pyrite size distribution from a PTB section at Gujo-Hachiman in Japan (Figure 1) show that the Lopingian deep-sea was dominated by oxic conditions, but that the oxygen minimum zone (OMZ) rapidly expanded at shallower depths in the mid-Panthalassa immediately before the EPME (Algeo et al, , 2011bWignall et al, 2010;Fujisaki et al, 2019). Uranium isotopic studies of shallow-water carbonates from the Tethyan and Panthalassic oceans also suggest that the global marine redox conditions during the Guadalupian and Lopingian (late Permian) were similar to those of the modern ocean, and that a major expansion of oceanic anoxia began ≤70 kyr before the EPME (Brennecka et al, 2011;Elrick et al, 2017;Zhang et al, 2018a;Zhang et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Development of Deep-Sea Anoxia in Panthalassa During the Lopingian (Late Permian): Insights From Redox-Sensitive Elements and Multivariate Analysis

Onoue¹,

Soda

Isozaki

2021

Front. Earth Sci.

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The end-Permian mass extinction (EPME) was the most severe mass extinction event of the Phanerozoic, and was associated with the development of global oceanic anoxia. The intensification of ocean anoxia preceded the EPME, but the degree of intensity and timing of oceanic redox changes in the mid-Panthalassa Ocean remain debated. Here we present the results of geochemical and multivariate statistical analyses of a late Guadalupian to Lopingian (middle–late Permian) bedded chert succession from the Iwaidani section, Japan, which preserves pelagic deep-sea facies from the ocean floor to the lower flank of a mid-Panthalassan seamount. The entire section yields a low manganese-enrichment factor (MnEF <1), suggesting that suboxic conditions has appeared in the depositional environment already in the late Guadalupian. Enrichment factors of other redox-sensitive trace-elements (e.g., vanadium and uranium) and principle component analysis (PCA) of major element data show the development of suboxic to weakly anoxic conditions across the Guadalupian/Lopingian boundary. Subsequently, anoxic conditions, as inferred from enrichments in U, Mo, Ni, Cu, Zn, and Tl, were developed during the middle Lopingian. Extremely high concentrations of U and Mo (enrichment factors of ∼6 and ∼5,500, respectively) indicate that H2S-rich euxinic conditions developed during the latest Lopingian and around the time of the EPME. The cause of the shift toward more reducing conditions in the early–middle Lopingian is unknown, but PCA results suggest that the euxinic conditions occurred in association with intensified continental weathering in response to a temperature rise during the ca. 200 kyr before the EPME.

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Section: Redox-sensitive Elementsmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Deep-Sea Anoxia in Panthalassa During the Lopingian (Late Permian): Insights From Redox-Sensitive Elements and Multivariate Analysis

Onoue¹,

Soda

Isozaki

2021

Front. Earth Sci.

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The implications of the giant bivalve family Alatoconchidae for the end‐Guadalupian (Middle Permian) extinction event

2021

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The end-Guadalupian extinction is an important biotic event in the Phanerozoic with an ecological impact comparable to the 'big five' extinctions. However, the age, pattern, and mechanism of this extinction are all under debate. The bivalves of the Alatoconchidae family attained body volumes up to 10,000 cm 3 and had a wide distribution in the low latitude Palaeotethys and Panthalassa. These giant clams originated in the early Kungurian and went extinct in the Late Guadalupian. Therefore, they are the typical victims of the end-Guadalupian extinction and are major index fossils for the understanding of this event. Although extraction of these giant bivalves from the host-resistant limestone is hard, plenty of new-found transverse sections on outcrops are available for morphological reconstruction and volume estimation. The measurement from the representative fossil localities in South China indicates the clams achieved a substantial volume increase during the Wordian and sustained the giant size to the late Capitanian, till their abrupt disappearance. The giant clams originated under atmospheric hyperoxia and warm climate after the Late Palaeozoic Ice Age. Their body volume increase was roughly parallel to the seawater warming. The accompanied high seawater carbonate saturation and Mg/Ca ratio are beneficial to their biomineralization of the large shells with aragonite or high-Mg calcite components. On the contrary, these giant bivalves were probably killed by the major or rapid changes of those environmental factors that once facilitated their success, such as drastic fluctuation of seawater temperature, sudden ocean acidification, and marine anoxia.

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Millennial-scale ocean redox and δ13C changes across the Permian–Triassic transition at Meishan and implications for the biocrisis

Wei

Zhang

Qiu

2020

Int J Earth Sci (Geol Rundsch)

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Redox condition and nitrogen cycle in the Permian deep mid-ocean: A possible contrast between Panthalassa and Tethys

Cited by 17 publications

References 67 publications

Development of Deep-Sea Anoxia in Panthalassa During the Lopingian (Late Permian): Insights From Redox-Sensitive Elements and Multivariate Analysis

Development of Deep-Sea Anoxia in Panthalassa During the Lopingian (Late Permian): Insights From Redox-Sensitive Elements and Multivariate Analysis

The implications of the giant bivalve family Alatoconchidae for the end‐Guadalupian (Middle Permian) extinction event

Millennial-scale ocean redox and δ13C changes across the Permian–Triassic transition at Meishan and implications for the biocrisis

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