The Paleocene Eocene carbon isotope excursion in higher plant organic matter: Differential fractionation of angiosperms and conifers in the Arctic

作者: Stefan Schouten , Martijn Woltering , W. Irene C. Rijpstra , Appy Sluijs , Henk Brinkhuis

DOI: 10.1016/J.EPSL.2007.04.024

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摘要: Abstract A study of upper Paleocene–lower Eocene (P–E) sediments deposited on the Lomonosov Ridge in central Arctic Ocean reveals relatively high abundances terrestrial biomarkers. These include dehydroabietane and simonellite derived from conifers (gymnosperms) a tetra-aromatic triterpenoid angiosperms. The relative percentage angiosperm biomarker summed angiosperm + conifer biomarkers was increased at end Paleocene–Eocene thermal maximum (PETM), different when observed with pollen counts which showed decrease pollen. Stable carbon isotopic analysis these shows that negative isotope excursion (CIE) during PETM amounts to 3‰ for both conifer biomarkers, simonellite, comparable magnitude CIE inferred marine carbonates, but significantly lower than 4.5‰ C29 n-alkane [M. Pagani, N. Pedentchouk, M. Huber, A. Sluijs, S. Schouten, H. Brinkhuis, J.S. Sinninghe Damste, G.R. Dickens, IODP Expedition 302 Scientists (2006), Arctic's hydrology global warming maximum. Nature, 442, 671–675.], is compound sourced by Conspicuously, angiosperm-sourced aromatic triterpane much larger 6‰ suggests angiosperms their fractionation PETM. Our results thus indicate reported previously represents average this site suggest large variable records may be partly explained contributions differential response points physiological responses vegetation types rise temperature, humidity, greenhouse gases

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