Onset of environmental disturbances in the Panthalassic Ocean over one million years prior to the Triassic-Jurassic boundary mass extinction

Oscillations of a fluvial‐lacustrine system and its ecological response prior to the end‐Triassic: Evidence from the eastern Tethys region

“…The detrital charcoal fragments and inertinite recovered from the samples of the Xujiahe Formation also indicate a disturbed environment marked by intensive wildfire events (Lu, 2019; Pole et al, 2018). This ecosystem disturbance is also indicated by a series of discrete spikes in sulphide content and changes in planktonic community composition in the Panthalassic Ocean prior to the Tr–J boundary (Schoepfer et al, 2022).…”

Did changes in terrigenous components of deep-sea cherts across the end-Triassic extinction relate to Central Atlantic magmatic province volcanism?

“…Mercury (Hg) anomalies are also widely used as a tracer of CAMP volcanism and were detected around the radiolarian extinction interval at the Katsuyama and Kurusu sections (Schoepfer et al, 2022;Shen et al, 2022). However, these Hg peaks are not only the intervals above the radiolarian turnover level but also the intervals a few meters below this level (several Myr before ETE; Schoepfer et al, 2022;Shen et al, 2022). Thus, considering the sedimentation rate of these sections as ca.…”

“…Because the Os isotope ratio of seawater reflects the mixing of felsic and mafic rock weathering, mantle, and extraterrestrial sources (Peucker-Ehrenbrink and Ravizza, 2000), the positive Os shift across the radiolarian turnover level may reflect increased felsic rock weathering relative to mafic rock weathering, such as CAMP, although negative Os isotope shifts across the ETE were reported from St. Audrie's section (Cohen and Coe, 2002). Thus, it is difficult to examine the timing of CAMP volcanism based on the Os isotope record in the Kurusu section, possibly related to the diagenetic transportation of Os in pyrite in the Kurusu section (Schoepfer et al, 2022).…”