Abstract
The distributions of carboxylic acids generated by mild Na2Cr2O7/AcOH oxidation of sulphur-rich kerogens from the Nördlinger Ries, southern Germany, were studied by gas chromatography and combined gas chromatography/mass spectrometry. Major oxidation products were saturated normal monocarboxylic acids (C8C31), saturated normal α,ω-dicarboxylic acids (C8C29), and isoprenoid acids (C14C21, except C18). Less dominant were iso- and anteiso-acids (C11C18), oxo-acids (mainly 10-oxo-n-octadecanoic acid), n-monoenoic acids (C16:1 and C18:1), series of 3β-carboxysteroids, hopanoic acids, isoprenoid and steroid ketones, maleimides (1H-pyrrole-2,5-diones), and aromatic acids. The lipid composition of the kerogens is consistent with a major contribution from planktonic and microbial organisms in sample from NR-10, and mixed autochthonous and allochthonous sources in samples from well NR-30 located closer to the rim of the basin. Furthermore, the data indicate a predominantly open-chain cross-linked structure for the Nördlinger Ries kerogens and point toward a mild thermal history for these samples. The results further confirm the presence of tetrapyrrole pigments which are most likely entrapped in the molecular sieve-type network of kerogens.
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