Abstract
Analysis of Mesoproterozoic sediment extracts from the North China Craton by gas chromatography–mass spectrometry metastable reaction monitoring revealed an extended series of C18–C33 13α(n-alkyl)-tricyclic terpanes. This discovery extends the previous known series to C33 with sixteen homologs. Because of the abundant presence of C22 and C27 homologs, and no isomeric peaks for the homologs > C24, it was confirmed that the side chain at the C-13 position is a long-chain n-alkyl group without a methyl substituent or an asymmetric carbon atom. The distribution of the extended tricyclic terpanes in the Mesoproterozoic sediments is mainly controlled by a primitive biological community, probably from certain specific bacteria and/or cyanobacteria. Their biological precursor was probably inhibited by high-salinity water conditions and not evolved during the deposition of the Gaoyuzhuang Formation.
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