Calcimicrobial stromatolites at the Permian–Triassic boundary in a western Tethyan section, Bükk Mountains, Hungary

Isotopic chemostratigraphy of the microbialite-bearing Permian–Triassic boundary section in the Zagros Mountains, Iran

“…The texture of the calcite is probably formed by an abiotic precipitation. These characteristics resemble the microbialites described from the PTB sections of Sichuan Province in South China (Lehrmann, 1999;Kershaw et al, 1999;Lehrmann et al, 2003;Ezaki et al, 2003) and Hungary (Hips and Haas, 2006). Fine-grained carbonate sediment containing small gastropods and ostracods fills the space between the crusts.…”

“…The Zagros PTB section is significant also in terms of the occurrence of organosedimentary crusts that have been reported from the other PTB sections elsewhere (Sano and Nakashima., 1997;Lehrmann, 1999;Kershaw et al, 1999Kershaw et al, , 2002Wignall and Twitchett, 2002;Ezaki et al, 2003;Hips and Haas, 2006;Pruss et al, 2006). These have been generally described as microbialites that were deposits formed by a result of a benthic microbial community (Brune and Moore, 1987).…”

Permian–Triassic boundary microbialites (PTBMs) in southwest China: implications for paleoenvironment reconstruction

“…According to the process envisaged, organic matter concentrated in anoxic stratified ocean bottom was subject to sulfate reduction under the effect of anaerobic bacteria, presumed to have given rise to a large reservoir of dissolved inorganic carbon (DIC) present as HCO 3 − , CO 3 2− , together with H 2 S. The DIC was upwelled to oxygen-enriched shallow sea and quickly degassed, resulting in extreme saturation of the carbonate content of the seawater so that calcification of microbial mats and the formation of PTBMs took place. This model was widely invoked in numerous studies (Lehrmann et al 2003;Baud et al 2005Baud et al , 2007Hips and Haas 2006;Pruss et al 2006;Kershaw et al 2007;Ezaki et al 2008;Kershaw et al 2009Kershaw et al , 2011Mary and Woods 2008;Mata and Bottjer 2011). Coupling between PTBMs occurrence and the negative excursion of carbon isotopes (Mu et al 2009) supported this hypothesis.…”

Discovery of an earliest Triassic, post-extinction foraminiferal assemblage above the Permian-Triassic boundary, Strandzha nappes, northwest Turkey.

“…Some ques tionable oc cur rences of this taxon are in di cated in the Olenekian (late Early Tri as sic; Krainer and Vachard, 2011). Rep re sen tatives of the ge nus Earlandia are known from the level above the P-Tr mass ex tinc tion ho ri zon in South China (Ezaki et al, 2003;Song et al, 2007Song et al, , 2009a, south ern Tur key Angiolini et al, 2007), It aly (Groves et al, 2007) and Hun gary (Hips and Haas, 2006). Postcladella kalhori and Earlandia oc cur to gether with in ferred di sas ter taxa foraminifer in the af ter math of the P-Tr cri sis (Hal lam and Wignall, 1997;Groves and AltÏner, 2005;Groves et al, , 2007Song et al, 2007Song et al, , 2009a.…”