NotePossible algal origin of long chain odd n-alkanes in immature sediments as revealed by distributions and carbon isotope ratios
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2022, Marine and Petroleum GeologyCitation Excerpt :A relatively wide range of δ13Cvalues of n-alkanes (difference up to 3.6‰) in the analyzed samples may result from diverse carbon sources (algae, bacteria and higher plants). The obtained low δ13C values (<−28‰) could be also attributed to algal origin of the OM (Collister et al., 1994; Lichtfouse et al., 1994; Love et al., 1998; Liu et al., 2015) that is consistent with Rock-Eval data (Section 2.1; Gajica et al., 2017a) and molecular composition of bitumen and liquid pyrolysates from OS (Section 3.1). A slightly elevated values of δ13C in the sample D16 in comparison to D13 can be attributed to higher contribution of prokaryotic organisms, confirmed by lower S/H ratio (Table 1) and different conditions in depositional environment (Gajica et al., 2017a).