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

Yans, J.; Corfield, Richard; Racki, G. and Preat, A. (2007). Evidence for perturbation of the carbon cycle in the Middle Frasnian punctata Zone (Late Devonian). Geological Magazine, 144(2) pp. 263–270.

DOI: https://doi.org/10.1017/S0016756806003037

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.

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