Pyrolysis-compound specific isotopic analysis (Py-CSIA) of the Senonian (Upper Cretaceous) conifer Frenelopsis oligostomata.

3 páginas.-- 1 figura.-- 2 tablas.-- 12 referencias.-- Comunicación oral presentada en The 17th Meeting of the International Humic Substances Society . Natural Organic Matter: Structure-Dynamics-Innovative applications., Ioannina, Greece September 1-5 2014

Bulk ¿13C indicate that Frenelopsis oligostomata was adapted to highly xeric and saline conditions. This is the first report of ¿D, ¿15N and ¿18O values for Frenelopsis organic fossil remains. and its humic fractions in bulk and also for ¿D, ¿13C for specific compounds. The ¿13C Py-CSIA values are given for a number of biogenic molecules and for probable diagenetic compounds. Py-CSIA gives better approach to the real ¿13C (c. -22 ¿). Values for ¿D Py-CSIA of lipids in the humin fraction is assumed to be representative of the original hydrogen isotopic signal of water in the area in the Upper Cretaceous (¿D= -124.44±5.21). Shifts towards depleted ¿D Py-CSIA values of other compounds may reflect different rates of hydrogen exchange mainly with the environment water during diagenesis. Then Py-CSIA provides valuable clues to reconstruct palaeoecosystems.

Projects CGL2012-38655-C04-01 and CGL2008-04296 and fellowship BES-2013-062573 given by the Spanish Ministry for Economy and Competitiveness to N.T.J.M.

Peer Reviewed