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• W2896749853 endingPage "32" @default.
• W2896749853 startingPage "23" @default.
• W2896749853 abstract "Fires are likely to have been central to the formation of certain inertinite macerals in South African coals. To investigate this hypothesis, a Permian, medium rank C bituminous Witbank coal (No. 4 Seam Upper) was density fractionated to yield an inertinite-rich and a vitrinite-rich sample, and assessed using stable nitrogen and carbon (δ15N and δ13C) isotopes in conjunction with nitrogen functionalities. The parent coal comprises of 41.6 vol% vitrinite and 48.5 vol% inertinite. The vitrinite-rich sample is dominated by collotelinite and collodetrinite (81 vol% vitrinite), and the inertinite-rich sample by fusinite, semifusinite, and inertodetrinite (63 vol% inertinite). The δ15N and δ13C values and nitrogen functionalities were used to constrain early coal formation pathways for the dominant macerals in the density fractionated samples. The vitrinite-rich sample has a lower δ13C relative to the inertinite-rich counterpart. However, the inertinite-rich sample has the lower δ15N value, along with a lower concentration of N-quaternary and higher N-pyrrolic compounds. Because these samples are of the same coal maturity, and the major macerals were derived from similar precursors, differences in δ15N and δ13C and nitrogen functionalities reflect differences in coal formation pathways. Degradation of 13C-rich cellulose in wood through either charring or bacterial activity leads to lower δ13C values. The lower 14N content for the vitrinite-rich sample along with higher N-quaternary and N-pyridinic suggests cellulose degradation driven by bacterial activity. In contrast, the higher 14N coupled with higher N-pyrrolic and N-oxide complexes for the inertinite-rich sample, suggests fusinite and semifusinite were formed through charring. Inertodetrinite is attributed to the disintegration of the charred matter." @default.
• W2896749853 created "2018-10-26" @default.
• W2896749853 creator A5013870732 @default.
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• W2896749853 date "2018-12-01" @default.
• W2896749853 modified "2023-10-12" @default.
• W2896749853 title "Using δ15N and δ13C and nitrogen functionalities to support a fire origin for certain inertinite macerals in a No. 4 Seam Upper Witbank coal, South Africa" @default.
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• W2896749853 doi "https://doi.org/10.1016/j.orggeochem.2018.10.007" @default.
• W2896749853 hasPublicationYear "2018" @default.
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