Methane-seep brachiopod fauna within turbidites of the Sinaia Formation, Eastern Carpathian Mountains, Romania

Evolution of the last koninckinids (Athyridida, Koninckinidae), a precursor signal of the early Toarcian mass extinction event in the Western Tethys

“…In this sense, Gaillard et al (2011) also found cold-seep communities linked to active syn-sedimentary faults, and the Lower Cretaceous Carpathian Peregrinella deposits, which were established as methane-seep environments (Sandy et al, 2012), show similar depositional scenarios to the Subbetic one. Seep deposits and faunas related to epioceanic seamounts are also confirmed by Gischler et al (2003) or Little et al (2004).…”

“…Campbell et al, 2002;cf. Peckmann and Thiel, 2004;Sandy et al, 2012;Peckmann et al, 2013) and given that one of the main destabilization events of marine gas hydrates took place during the Pliensbachian-Toarcian transition (e.g. Hesselbo et al, 2000Hesselbo et al, , 2007Beerling et al, 2002;Vörös, 2002;Cohen et al, 2007;Suan et al, 2010), a tentative analysis of the Subbetic koninckinid-bearing deposits has been carried out, focused on various criteria that can play a role as cold-seep proxies.…”

“…Tectono-sedimentary framework.-The continuous Early Jurassic rifting stage that led to the drowning of the Subbetic platform by the activity of listric faults in turn generated extensional fractures and crevices in the epioceanic escarpments, and could be a propitious framework to facilitate the cold-seep events (e.g. Vörös, 2002;Sandy et al, 2012;Peckmann et al, 2013) and the…”

“…They commonly form cluster accumulations as an adaptive response to these very restricted confined habitats. Cold-seep deposits are often characterized by mass occurrences and dense populations of packed individuals (Callender and Powell, 1999;Peckmann et al, 2001Peckmann et al, , 2007Peckmann et al, , 2011Peckmann et al, , 2013Kiel and Peckmann, 2008;Sandy et al, 2012). In addition to the exceptional profusion of specimens, these habitats show monospecific or oligotypical communities (Callender and Powell, 1999;Gischler et al, 2003;Kaim et al, 2010;Peckmann et al, 2013).…”

Paleocene methane seep and wood-fall marine environments from Spitsbergen, Svalbard

“…Turbidite currents can be an important factor shaping seep environments, dispersing epifauna and effectively removing it from the seep ecosystem (e.g. Sandy et al, 2012) and covering the seep surface with a blanket of clastic material (e.g. Agirrezabala et al, 2013), sealing of the carbonate and sulphidic substrate for seep-inhabiting biota.…”