Cyanobacterial blooms tied to volcanism during the 5 m.y. Permo-Triassic biotic crisis

Triggers of Permo-Triassic boundary mass extinction in South China: The Siberian Traps or Paleo-Tethys ignimbrite flare-up?

“…The ash layers were initially thought to represent regional eruptive activity associated with a volcanic arc along the margin of the South China craton (Shen et al, 2013;Yin et al, 1989Yin et al, , 1992, but later were linked to the Siberian Traps due to the temporal coincidence between these two events . Recent studies have focused on the spatial and the temporal distribution of the ash layers and their relationship to contemporaneous biotic and environmental changes (Xie et al, 2010;Shen et al, 2012Shen et al, , 2013.…”

“…Potential cause of the PTB mass extinction has been debated on (1) bolide impacts (Becker et al, 2010;Becker et al, 2004;Kaiho et al, 2006;Retallack and Jahren, 2008); (2) rapid anoxia in deep water (e.g., Twitchett, 1996, 2002); (3) a major sea-level fall or regression (Kozur, 2007); (4) large-scale continental flood volcanism (Campbell et al, 1992;Racki and Wignall, 2005;Renne et al, 1995) and (5) regional acidic volcanism of South China (Isozaki et al, 2007;Xie et al, 2010;Yin et al, 1989). The bolide impact model is not favored, given the absences of Ir anomaly, shock mineral assemblage and meteor crater around PTB sections in the world, and prolonged two-episode mass extinction pattern (Song et al, 2013;Xie et al, 2005;Yin et al, 2007Yin et al, , 2012.…”

“…A few recent studies documented the spatio-temporal distribution of the PTB ash layers and their relationship to contemporaneous biotic and environmental changes (Gao et al, 2013;Shen et al, 2012Shen et al, , 2013Xie et al, 2010). Particularly, a close relationship between PTB volcanic ashes and carbon cycle perturbations during the P-T transition in the Xiakou and Xinmin sections is examined by Shen et al (2012).…”

A Review on Microbialites: a Korean Perspective

“…페름기 말 대멸종 직후 약 150만 년에서 500만 년에 걸쳐 주로 Renalcis 그룹 또는 Microcystis로 생각되는 미생물과 미크라이트로 구성된 미생물암이 전 세계적으로 널리 나타났다 (Kershaw et al, 1999(Kershaw et al, , 2012Ezaki et al, 2003;Wu et al, 2014). 이 시 기의 미생물암은 주로 저위도 지역의 다양한 퇴적 환 경에 분포하였으며 (Kershaw et al, 2012), 트라이아 스기 중기 이후 후생동물 생태계가 대멸종의 타격에 서 점차 회복되면서 크게 감소하였다 (Xie et al, 2010;Brayard et al, 2011). 이후 쥐라기 중후기 및 백악기 초기에 주로 쓰롬볼 라이트와 스트로마톨라이트로 구성된 미생물암이 상 대적으로 흔하게 나타나며, 이들은 얕은 바다에서는 산호와, 깊은 바다에서는 해면동물과 함께 생물초를 형성하였다 (Leinfelder et al, 1993(Leinfelder et al, , 1994Dupraz and Strasser, 1999;Parcell, 2002;Olivier et al, 2003Olivier et al, , 2006Bádenas and Aurell, 2010).…”

Geomicrobial functional groups: A window on the interaction between life and environments

“…For example, across the PermianTriassic boundary, volcanic eruptions contributed more CO 2 to the atmosphere, which may have favored diazotrophic cyanobacteria to compete over phytoplankton in low nitrate environments [201]. Ocean acidification also may prevent diatoms and coccolithes from acquiring more soluble iron, which further makes iron more restricted for marine primary producers [202].…”