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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 ,
R. M. CORFIELD ,
G. RACKI  and
A. PREAT
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
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Abstract

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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.

Keywords

punctata EventFrasniancarbon isotopesArdennesBelgium
Type
Original Article
Information
Geological Magazine , Volume 144 , Issue 2 , March 2007 , pp. 263 - 270
Copyright
© 2007 Cambridge University Press