1. Evidence for perturbation of the carbon cycle in the Middle Frasnian punctata Zone (late Devonian)
- Author
-
Yans, J., Corfield, R.M., Racki, G., and Preat, A.
- Subjects
Global warming -- Environmental aspects ,Carbon cycle (Biogeochemistry) -- Research ,Sea level -- Research ,Earth sciences - 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.
- Published
- 2007