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- W1997535959 abstract "The effects of weathering on the organic matter within a narrow sediment interval from surficial to 10 m depth belonging to the Lower Toarcian shales of the Paris basin, were studied at a molecular level. Among the compositional changes observed, the most striking feature is a severe breakdown of the metalloporphyrins (Ni and VO) at the surface, as evidenced by quantitative data. In addition, this degradation of the geoporphyrins is accompanied by substantial modification of their composition with preferential degradation of porphyrins with exocyclic rings over polyalkylporphyrins. These quantitative and qualitative changes are thought to result from exposure of the sediment to weathering conditions. More specifically, abiotic oxidation is likely to be the main weathering process responsible for this superficial alteration of the sedimentary porphyrins. This is particularly suggested by oxidation experiments carried out on a mixture of sedimentary nickel and vanadyl porphyrins where oxidation of the former complexes occurs at a faster rate. Thus, geoporphyrins may be used as molecular indicators to evaluate the degree of oxidation of weathered geological samples containing this kind of molecule." @default.
- W1997535959 created "2016-06-24" @default.
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- W1997535959 date "2004-02-01" @default.
- W1997535959 modified "2023-09-24" @default.
- W1997535959 title "Effects of weathering on nickel and vanadyl porphyrins of a Lower Toarcian shale of the Paris basin" @default.
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- W1997535959 doi "https://doi.org/10.1016/s0016-7037(03)00496-4" @default.
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