DISTRIBUCIÓN DE BIOMARCADORES EN UN CARBÓN SOBREMADURO OBTENIDOS POR DEPOLIMERIZACIÓN PARCIAL CON N-METIL-2-PIRROLIDINONA (NMP)

Abstract

The whole organic geochemistry applied to coals and source -rocks rests on the skill of the dichloromethane to extract bitumen of the same ones. Without bitumen, an organic geochemical characterization is a hard task, since the absence of bi omarkers for interpreting environment, type of organic matter, reached maturity, or redox conditions. When a coal reaches the metagenesis state (low - volatile bituminous coals or anthracites), it is not obtained bitumen from dichloromethane. Nevertheless, the solvent-assisted depolymerization of coal generates an extract in extremely mature coals. In this work, we report the existence of biomarckers isolated of the non -polar fraction, eluted with n-hexane, from an extract obtained by depolymerization of a very-high rank coal using N-methyl-pyrrolidinone (NMP) as specific solvent. N-alkanes, isoprenoids and cyclic hydrocarbons were detected, together with tri- and pentacyclic terpanes, all of them recognized biomarkers in organic geochemistry for the valuable information that they contribute, relative to maturity, as like to type of organic matter , and physicochemical reox conditions. These results necessarily will make us to re-think some aspects related to the supposed instability of the biomarkers during the metagenesis.