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dc.contributor.authorMaslen, Ercin
dc.contributor.authorGrice, Kliti
dc.contributor.authorDawson, Daniel
dc.contributor.authorWang, Sue
dc.contributor.authorHorsfield, B.
dc.contributor.editorHarris NB, Peters KE
dc.date.accessioned2017-03-15T22:04:35Z
dc.date.available2017-03-15T22:04:35Z
dc.date.created2017-02-24T00:09:18Z
dc.date.issued2013
dc.identifier.citationMaslen, E. and Grice, K. and Dawson, D. and Wang, S.X. and Horsfield, B. 2013. Stable hydrogen isotopes of isoprenoids and n-alkanes as a proxy for estimating the thermal history of sediments through geological time, in Harris, N. and Peters, K. (eds), Analyzing the thermal history of sedimentary basins: Methods and case studies, pp. 29-43. Tulsa, Oklahoma: SEPM Society for Sedimentary Geology.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/49377
dc.description.abstract

The effect of thermal maturation on the δD values of individual petroleum hydrocarbons (n-alkanes and regular isoprenoids) from sedimentary organic matter over geological timescales has been explored in six different sedimentary sequences covering a wide range of maturities; i.e., 0.53% – 1.6% vitrinite reflectance (R o or equivalent; i.e., Re , Rc ). These include new data and recently reported literature data on formations ranging in age from the Early Cretaceous to the Permian. The application of Deuterium/Hydrogen (D/H) of biomarkers as a maturity proxy for Devonian source rocks from the Western Canada Sedimentary Basin is also presented here, extending this application to much older sediments than previously studied. In each case, pristane and phytane are predominantly derived from the lipid side chain of chlorophyll a present in most photosynthetic organisms, with an additional (but minor) contribution to pristane from tocopherol of land plants in selected cases. The n-alkanes represent contributions of algae, bacteria, and in certain cases higher plants. In general, the n-alkanes, pristane, and phytane from relatively immature sediments have δ D values that retain the isotopic signature of their natural product precursors; i.e., biosynthesized lipid components made up of acetyl and isoprene subunits, respectively. With increasing maturity, pristane and phytane become more enriched in deuterium (D), while the n-alkanes generally remain at a constant isotopic composition until an overmature level is reached, at which point there is a significant enrichment of D in n-alkanes. The enrichment of D in pristane and phytane with increasing maturity correlates strongly with changes in traditional maturity parameters, including vitrinite reflectance, Tmax, and molecular parameters, providing evidence that D enrichment is associated with thermal maturation.

dc.publisherSEPM Society for Sedimentary Geology
dc.titleStable hydrogen isotopes of isoprenoids and n-alkanes as a proxy for estimating the thermal history of sediments through geological time
dc.typeBook Chapter
dcterms.source.startPage29
dcterms.source.endPage43
dcterms.source.titleAnalyzing the thermal history of sedimentary basins: Methods and case studies
dcterms.source.isbn9781565763173
dcterms.source.placeTulsa, Oklahoma
dcterms.source.chapter12
curtin.departmentDepartment of Chemistry
curtin.accessStatusFulltext not available


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