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Evidence for perturbation of the carbon cycle in the Middle Frasnian punctata Zone (Late Devonian)

par Yans, Johan ;Corfield, Richard;Racki, G.;Préat, Alain
Référence Geological magazine, 144, 2, page (263-270)
Publication Publié, 2007-03

Article révisé par les pairs

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Résumé :

New carbon isotopic data from the Devonian of Ardennes (Belgium) and partly from the Holy Cross Mountains (Poland) highlight an abrupt and high-amplitude negative excursion in the punctata conodont Zone. Published information from Moravia and China suggests that this Middle Frasnian negative excursion, jointly with the preceding large-scale positive shift, should be used as a global chemostratigraphic marker. Causation scenarios for this negative 'punctata Event' are correlated neither with major biota turnover nor major sea-level changes, but may be related to: (1) the Alamo Impact Event, that led to (2) the massive dissociation of methane hydrates and (3) the rapid onset of global warming. © 2007 Cambridge University Press.