Even-carbon predominance of Monomethyl branched alkanes in Humic coal from Junggar Basin, NW China

Abstract

A series of Monomethyl branched alkanes compounds were detected between nC14–nC36, in immature and low maturity Jurassic humic coal, Junggar basin. 2-methyl alkanes and 3-methyl alkanes accounted for the vast majority of the compounds. It is worth noting that the 2-methyl alkanes in the humic coal samples show an obvious distribution of even carbon predominances rarely reported in the literature. The results show that with the increase of Pr/Ph (pristane/phytane), the even carbon dominance of 2-methyl alkanes is more obvious, while the odd carbon number distribution of 3-methyl alkanes is weakened. As Pr/Ph increases in the humic coal, the relative content of the hopanes increased, while the relative content of 2-methyl alkanes and 3-methyl alkanes increases first and then decreases.

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Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (No. 41772124) and National Science and Technology Major Project (No. 2016ZX05007001-002).

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Correspondence to Min Zhang.

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Cheng, Q., Zhang, M. & Huang, G. Even-carbon predominance of Monomethyl branched alkanes in Humic coal from Junggar Basin, NW China. Acta Geochim 39, 434–444 (2020). https://doi.org/10.1007/s11631-019-00372-8

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Keywords

  • Junggar basin
  • Humic coal
  • Even carbon predominance
  • 2-methyl alkanes
  • 3-methyl alkanes