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Evidence for perturbation of the carbon cycle in the Middle Frasnian punctata Zone (late Devonian)
- Source :
- Geological Magazine. March, 2007, Vol. 144 Issue 2, p263, 8 p.
- Publication Year :
- 2007
-
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. Keywords: punctata Event, Frasnian, carbon isotopes, Ardennes, Belgium.
Details
- Language :
- English
- ISSN :
- 00167568
- Volume :
- 144
- Issue :
- 2
- Database :
- Gale General OneFile
- Journal :
- Geological Magazine
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.162785750