Organic sulfur in kerogen

Kerridge JF (1983) Isotopic composition of carbonaceous-chondrite kerogen evidence for an interstellar origin of organic matter in meteorites. Earth Planet Sci Lett 64 186-200 Kerridge JF, Haymon RM, Kastner M (1983) Sulfur isotope systematics at the 21°N site. East Pacific Rise. Earth Planet Sci Lett 66 91-100... 

The Microbial Mat. The "intermediate fraction of the extracts and pyrolysates of the kerogens of a modem and buried mat were analysed by GC with coupled FID and FPD and GC-MS. In the extract of the modem mat, two isomers of a C20 thiophenic isoprenoid (compounds I and II) already reported in the literature (11-12) are the most abundant organic sulfur compounds (Figure 5B). The "intermediate" fraction of the pyrolysate of the corresponding sample, is also dominated by the same two isomers of thiophenic isoprenoids that exhibit a similar internal ratio as in the extract. The presence of a third isomer was detected in smaller quantity (compound III)(13). Other thiophenic compounds are present in the sample and were tentatively identified using mass spectra data, GC retention time, and literature (14-16). They are similar to the compounds found in the "intermediate" fraction of the pyrolysate of the buried mat (Figure 5D). 

In this paper organically-bound sulfur in three types of high-molecular-weight organic matter (kerogen, asphaltenes and resins) obtained from three organic sulfur-rich sedimentary rock samples has been studied. Kerogen, asphaltene and resin fractions were isolated and characterised by the two described techniques. 

---