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Structural studies on Miocene kerogen

By Gonzalo Almendros Martín, Francisco Javier González-Vila, Francisco Martín Martínez and Concepción Álvarez Ramis

Abstract

The different characteristics of organic matter in Miocene sediment from Portazgo (Madrid, Spain) were studied by several physicochemical techniques. Then g.c.-m.s. was applied to bitumen and to oxidative degradation products of the insoluble organic residue. Both the palaeobotanic study and the composition of the bitumen fraction suggest an important contribution of vascular plants in the sediment; a predominance of odd-numbered alkanes, of straight-chain aliphatic compounds, and of high molecular weight homologues of the series were observed. The degradation methods employed yielded large proportions of aliphatic chains, but aromatic compounds amounted to ≈25 wt% of the degradation products, suggesting a significant contribution of lignin. In addition to the degradation with potassium persulphate followed by alkaline permanganate oxidation, by depolymerization perborate was also applied. The latter degradation method yielded aromatic acids and polymethylene compounds, and residual kerogen was transformed into an alkalisoluble polymer, which can be studied by the usual techniques for humic acids.Peer Reviewe

Publisher: 'Elsevier BV'
Year: 2012
DOI identifier: 10.1016/0016-2361(88)90346-8
OAI identifier: oai:digital.csic.es:10261/58756
Provided by: Digital.CSIC
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