期刊
GEOLOGICAL MAGAZINE
卷 144, 期 2, 页码 263-270出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0016756806003037
关键词
punctata Event; Frasnian; carbon isotopes; Ardennes; Belgium
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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