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.
Original language | English |
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Pages (from-to) | 263-270 |
Number of pages | 8 |
Journal | Geological Magazine |
Volume | 144 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Mar 2007 |
Keywords
- Ardennes
- Belgium
- Carbon isotopes
- Frasnian
- Punctata Event