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

Published online by Cambridge University Press:  09 February 2007

J. YANS
Affiliation:
Facultés Universitaires Notre-Dame de la Paix, 61 rue de Bruxelles, 5000 Namur, Belgium
R. M. CORFIELD
Affiliation:
Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
G. RACKI
Affiliation:
Department of Earth Sciences, Silesian University, Bedzinska 60, 41-200 Sosnowiec, Poland
A. PREAT
Affiliation:
Department of Earth Sciences, University of Brussels, CP 160/02, 50 av. F. Roosevelt, 1050 Brussels, Belgium

Abstract

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.

Type
Original Article
Copyright
© 2007 Cambridge University Press

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