Zirconium isotopes track volcanic inputs during the Permian-Triassic transition in South China

Jiao, Yu Yong; Zhou, Lian; Algeo, Thomas J.; Shen, Jun; Feng, Lanping; Hu, Yating; Liu, Jinhua; Chi, Liwei

doi:10.1016/j.chemgeo.2022.121074

Cited by 10 publications

(16 citation statements)

References 84 publications

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“…6b). Similar conclusions were reached for other volcanic ashes from successions straddling the PTB in South China, in that these ashes have no genetic link to the Siberian Traps, but instead derived from subduction zone arc volcanism in the Tethys region (Gao et al, 2013;He et al, 2014;Jiao et al, 2022;Song et al, 2022;Zhao et al, 2019).…”

Section: Provenance Of Volcanic Hg Inputsupporting

confidence: 71%

“…However, several studies have demonstrated that more proximal regional volcanic activity related to convergent plate tectonism and subduction magmatism occurred during the Permian-Triassic transition, which led to elevated Hg concentrations and may have contributed to the PTBME in South China (Gao et al, 2013;He et al, 2014;Jiao et al, 2022;H. Zhang et al, 2021;Zhao et al, 2019;Zheng et al, 2020).…”

Section: Provenance Of Volcanic Hg Inputmentioning

confidence: 99%

“…Reasons for a global increase in regional arc volcanism concurrent with STLIP volcanism are still uncertain. Jiao et al (2022) recently suggested that the ascent of the STLIP mantle plume may have triggered volcanic activity in several subduction zone systems. While the effect of a large mantle plume on global plate tectonics is highly debatable, STLIP volcanism occurred in a context of global increase of accretion and subduction rates from the Permian to Triassic (Vérard et al 2015a, their Fig.…”

Section: Provenance Of Volcanic Hg Inputmentioning

confidence: 99%

“…The Upper Permian to Lower Triassic of South China is characterized by the widespread occurrence of volcanic ash layers (Gao et al, 2013;He et al, 2014;Yang et al, 2012), permitting precise and accurate U-Pb zircon geochronological calibrations of Permian-Triassic successions (e.g., Baresel et al, 2017aBaresel et al, , 2017bBurgess et al, 2014;Lehrmann et al, 2015;, as well as providing a means of evaluating the provenance of volcanic products (e.g. zircon) to sedimentary successions in South China (e.g., Jiao et al, 2022;Zhao et al, 2019). However, except for the Shangsi section (S. Shen et al, 2011), Hg anomalies recorded near the PTB from deep-water marine settings in South China lack U-Pb zircon age calibration.…”

Section: Introductionmentioning

confidence: 99%

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Timing and provenance of volcanic fluxes around the Permian-Triassic Boundary Mass Extinction in South China: U-Pb zircon geochronology, volcanic ash geochemistry and mercury isotopes

Edward

Paul

Bucher

et al. 2023

Preprint

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Anomalous mercury (Hg) contents recorded near the Permian-Triassic boundary (PTB) are often linked to Siberian Traps Large Igneous Province (STLIP) volcanism and the Permian-Triassic boundary mass extinction (PTBME). However, mounting evidence indicates that the relation between STLIP volcanism and Hg “anomalies” is not straightforward. This study focuses on the timing and provenance of volcanic fluxes around the PTBME in South China. We constrain carbon isotope (δ13C) and Hg concentration and isotope records by utilizing high-precision U-Pb zircon ages from two expanded deep-water marine sections spanning the Late Permian to Early Triassic in the Nanpanjiang Basin. Results reveal two episodes of Hg enrichment. The oldest episode predates the onset of a large negative δ13C excursion, which is documented to be older than 252.07 ± 0.130 Ma. The second episode occurred between 251.822 ± 0.060 Ma and 251.589 ± 0.062 Ma, coinciding with the nadir of the δ13C excursion. Volcanic ash geochemistry and Hg isotope compositions suggest that mercury was sourced from subduction-related volcanic arc magmatism in the Tethys region, which peaked between 251.668 ± 0.079 Ma and 251.589 ± 0.052 Ma. These results support the hypothesis that regional arc volcanism contributed to the causes of the PTBME in South China and provide evidence that Hg anomalies close to the PTB are not a reliable stratigraphic marker for the PTB extinction event. This study demonstrates that the relations between volcanism, environmental perturbations and mass extinction during the Permian-Triassic transition are better resolved with the aid of high-precision U-Pb zircon ages.

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Section: Provenance Of Volcanic Hg Inputsupporting

confidence: 71%

Section: Provenance Of Volcanic Hg Inputmentioning

confidence: 99%

Section: Provenance Of Volcanic Hg Inputmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Timing and provenance of volcanic fluxes around the Permian-Triassic Boundary Mass Extinction in South China: U-Pb zircon geochronology, volcanic ash geochemistry and mercury isotopes

Edward

Paul

Bucher

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In contrast, interbedded rocks differ strongly in Hg content between these rock formations (Figure 3). The much higher Hg content of volcanic ashes despite their higher susceptibility to weathering (e.g., Jiao et al., 2022) and as such, Hg loss, suggests that (a) Hg is reasonably well preserved in these strata, and (b) the disparity in Hg content between volcanic ashes and interbedded rocks is primary.…”

Section: Discussionmentioning

confidence: 99%

Timing and Provenance of Volcanic Fluxes Around the Permian‐Triassic Boundary Mass Extinction in South China: U‐Pb Zircon Geochronology, Volcanic Ash Geochemistry and Mercury Isotopes

Edward

Paul

Bucher

et al. 2023

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Anomalous mercury (Hg) contents recorded near the Permian‐Triassic boundary (PTB) are often linked to Siberian Traps Large Igneous Province (STLIP) volcanism and the Permian‐Triassic boundary mass extinction (PTBME). However, mounting evidence indicates that the relation between STLIP volcanism and Hg “anomalies” is not straightforward. This study focuses on the timing and provenance of volcanic fluxes around the PTBME in South China. We constrain carbon isotope (δ13C) and Hg concentration and isotope records by utilizing high‐precision U‐Pb zircon ages from two expanded deep‐water marine sections spanning the Late Permian to Early Triassic in the Nanpanjiang Basin. Results reveal two episodes of Hg enrichment. The oldest episode predates the onset of a large negative δ13C excursion, which is documented to be older than 252.07 ± 0.130 Ma. The second episode occurred between 251.822 ± 0.060 and 251.589 ± 0.062 Ma, coinciding with the nadir of the δ13C excursion. Volcanic ash geochemistry and Hg isotope compositions suggest that mercury was mainly sourced from subduction‐related volcanic arc magmatism in the Tethys region, which peaked between 251.668 ± 0.079 and 251.589 ± 0.052 Ma. These results are compatible with suggestions that regional arc volcanism contributed to the causes of the PTBME in South China and provide evidence that Hg anomalies close to the PTB are not a reliable stratigraphic marker for the PTB extinction event. This study demonstrates that relations between volcanism, environmental perturbations and mass extinction during the Permian‐Triassic transition are better resolved with the aid of high‐precision U‐Pb zircon ages.

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Zirconium and neodymium isotopes record intensive felsic volcanism in South China region during the Permian-Triassic boundary crisis

et al. 2023

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Zirconium isotopes track volcanic inputs during the Permian-Triassic transition in South China

Cited by 10 publications

References 84 publications

Timing and provenance of volcanic fluxes around the Permian-Triassic Boundary Mass Extinction in South China: U-Pb zircon geochronology, volcanic ash geochemistry and mercury isotopes

Timing and provenance of volcanic fluxes around the Permian-Triassic Boundary Mass Extinction in South China: U-Pb zircon geochronology, volcanic ash geochemistry and mercury isotopes

Timing and Provenance of Volcanic Fluxes Around the Permian‐Triassic Boundary Mass Extinction in South China: U‐Pb Zircon Geochronology, Volcanic Ash Geochemistry and Mercury Isotopes

Zirconium and neodymium isotopes record intensive felsic volcanism in South China region during the Permian-Triassic boundary crisis

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