Proceedings of the Ocean Drilling Program, 157 Scientific Results 1998
DOI: 10.2973/odp.proc.sr.157.140.1998
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Changes in kerogen composition across an oxidation front in Madeira Abyssal Plain turbidites as revealed by pyrolysis GC-MS

Abstract: Isolated kerogens from Madeira Abyssal Plain turbidite samples were qualitatively and semiquantitatively studied by means of analytical pyrolysis for the effect of oxygen exposure on organic matter preservation. The initial organic matter in the turbidite is very homogeneous and relatively high and offers an ideal case for the study of oxygen effects on organic matter preservation without the usual complications of varying sources or sedimentation rates and bioturbation. From all four studied turbidites, one s… Show more

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Cited by 14 publications
(12 citation statements)
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“…6). The py-GC/MS traces also show various other compounds belonging to the following series ( In a study of the kerogen from turbidites of the Madeira abyssal plain, Hoefs et al (1998) found series of pyrolysis products very similar to those found in the present study, namely, nalkane/n-alkene doublet distributions extending over a large carbon number range (<10 to >30), alkylphenols, alkylbenzenes and other alkylated aromatics, plus isoprenoids. Except for the phenols assumed to be derived from the lignin of terrestrial plants, the authors hypothesized that all the other compounds derived from algal biopolymers.…”
Section: Molecular Data (Py-gc/ms and Thermochemolysis With Tmah)supporting
confidence: 84%
“…6). The py-GC/MS traces also show various other compounds belonging to the following series ( In a study of the kerogen from turbidites of the Madeira abyssal plain, Hoefs et al (1998) found series of pyrolysis products very similar to those found in the present study, namely, nalkane/n-alkene doublet distributions extending over a large carbon number range (<10 to >30), alkylphenols, alkylbenzenes and other alkylated aromatics, plus isoprenoids. Except for the phenols assumed to be derived from the lignin of terrestrial plants, the authors hypothesized that all the other compounds derived from algal biopolymers.…”
Section: Molecular Data (Py-gc/ms and Thermochemolysis With Tmah)supporting
confidence: 84%
“…A number of variables control the d 13 C values of organic matter, including the TOC composition. In fact, it is well known that the d 13 C of organic matter tends to become depleted in 13 C with low TOC sediments as severe oxic diagenesis selectively removes 13 C-rich organic matter (Prahl et al 1997;Hoefs et al 1998). So, given the low TOC content of some of our sites (Fig.…”
Section: Discussionmentioning
confidence: 76%
“…Once deposited at the abyssal plain, the contact with the oxic bottom waters caused a ''burn down" effect resulting in degradation of the OM in the upper part of the turbidite by downward-diffusing oxygen while the lower part was left unaltered (Wilson et al, 1986). MAP turbidites are thus ideal to study the long-term effect of oxygen on OM degradation and preservation as the OM in the sediment was initially relatively homogenous and oxygen diffusion into the sediment has created ''oxidation fronts" which are easily identifiable (Cowie et al, 1995(Cowie et al, , 1998Hoefs et al, 1998).…”
Section: Introductionmentioning
confidence: 98%
“…A large number of studies of OM degradation due to long-term oxygen exposure have used OM-rich turbidites from the Madeira Abyssal Plain (MAP) (Wilson et al, 1986;de Lange et al, 1987;Cowie et al, 1995Cowie et al, , 1998Hoefs et al, 1998;Hoefs et al, 2002;Prahl et al, 1997). These sediments were originally deposited on the northwestern African shelf and subject to anoxic diagenesis.…”
Section: Introductionmentioning
confidence: 99%
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