Authors / CoAuthors
Sandison, C.M. | Newman, J. | Boreham, C.J. | Alexander, R. | Kagi, R.I.
Abstract
The transgression of coal depositional systems by marine waters enables the preservation of functionalised lipids, such as steranes, hopanes and higher plant triterpanes, via their reaction with reduced inorganic sulphides produced by sulphate-reducing bacteria. Using compound specific isotopic analysis, higher plant and microbial sources of these lipids can be identified. The carbon isotopic compositions of the lipids are invariant to differences in the degree or timing of marine incursion. This indicates that the introduction of marine waters at any stage of mire and peat development preserves the inherited lipid composition and does not overwhelm this biotic signature during sulphate reduction. Consequently, the selective preservation of certain biomarkers enables their use in the reconstruction of coal palaeoenvironments and facilitates oil-source rock correlations. The presence of these coal-derived chemical markers in crude oils is testament to the petroleum generation potential of marine-influenced coals.
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nonGeographicDataset
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38293
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- External PublicationAbstract
- ( Theme )
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- organic geochemistry
- ( Theme )
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- marine
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2002-01-01T00:00:00
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