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Hydrogen isotopic characteristics and their genetic relationships for individual n-alkanes in plants and sediments from Zoigê marsh sedimentary environment

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Abstract

To understand internal relations of their hydrogen isotopic compositions in typical marsh environment, we, using GC-IRMS analytical technique, measured the hydrogen isotopes of individual n-alkanes in the herbaceous plant, woody plant leaf, and sediments from Zoigê marsh in China. The results show significant differences in the hydrogen isotopic compositions of n-alkanes among the different kinds of plants and the different species in the same kind. δD values of n-alkanes in the herbaceous plants (from −254‰ to −184‰) are lighter than those in woody plant leaf (from −195‰ to −142‰), and the hydrogen isotopic compositions of n-alkanes in K. tibetica P. are lighter than P. pratensis L. The mean δD values of n-alkanes in the sediments from Zoigê marsh reflect that they were derived from herbaceous plants, which is consistent with the peat samples being composed mainly of herbaceous plant remnants. The significant differences in hydrogen isotopic compositions of n-alkanes among the sedimentary samples are caused possibly by environment factors and the difference in input quantity of different herbaceous plants. A certain negative correlation exists between the δ 13C and δD values of n-alkanes in the samples, and plant types can be distinguished using the cross plot of δD vs. δ 13C values of n-alkanes in the plants. These data and recognitions provide scientific basis for hydrogen isotopic applied research of individual n-alkanes.

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Authors and Affiliations

  1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, 730000, China

    Yi Duan & BaoXiang Wu

  2. Department of Geology, Northwest University, Xi’an, 710069, China

    ChaoYang Zheng

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  1. Yi Duan
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  2. ChaoYang Zheng
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  3. BaoXiang Wu
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Correspondence to Yi Duan.

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Duan, Y., Zheng, C. & Wu, B. Hydrogen isotopic characteristics and their genetic relationships for individual n-alkanes in plants and sediments from Zoigê marsh sedimentary environment. Sci. China Earth Sci. 53, 1329–1334 (2010). https://doi.org/10.1007/s11430-010-4009-9

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  • DOI: https://doi.org/10.1007/s11430-010-4009-9

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