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dc.contributor.authorDawson, Daniel
dc.contributor.authorGrice, Kliti
dc.contributor.authorWang, Sue
dc.contributor.authorAlexander, Robert
dc.date.accessioned2017-01-30T11:33:42Z
dc.date.available2017-01-30T11:33:42Z
dc.date.created2009-03-05T00:55:19Z
dc.date.issued2004
dc.identifier.citationDawson, Daniel and Grice, Kliti and Wang, Sue xuan and Alexander, Robert. 2004. Stable hydrogen isotopic composition of hydrocarbons in torbanites (Late Carboniferous to Late Permian) deposited under various climatic conditions. Organic Geochemistry. 35 (2): pp. 189-197.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/12940
dc.identifier.doi10.1016/j.orggeochem.2003.09.004
dc.description.abstract

We measured the stable hydrogen isotopic composition (δD) of selected aliphatic compounds in torbanites from Scotland and Australia, covering the Late Carboniferous to the Late Permian. The torbanites contain organic matter predominantly from a single algal source, Botryococcus braunii, and are of similar thermal maturity. The δD values of n-alkanes in the extracts appear to reflect the depositional palaeoclimate of each torbanite, in response to the typical δD values of meteoric waters. The δD values of n-alkanes in torbanites deposited at high latitude under glacial conditionsare depleted in deuterium by up to 70% relative to n-alkanes in a torbanite deposited at low latitude under a tropical climate regime. Torbanites deposited in mid-latitude regions under cool-temperature conditions contain n-alkanes with δD values between those of n-alkanes in tropical and glacial sediments. A saw-toothed profile of δD values obtained for the n-alkanes in the Australian torbanites is attributed to a dual-source system, perhaps a predominant B. braunii input with a second minor contribution from land plants. Pristane and phytane from two Australian torbanites are significantly depleted in deuterium relative to n-alkanes in the same samples and a significant difference between the δD values of pristane and phytane is suggested to be caused by different sources for the two isoprenoids, or isotope effects associated with their derivation from a common phytol precursor. The offset between the δD of values of n-alkanes and isoprenoids is similar to that found in modern biological samples, indicating that their indigenous δD signatures may have been preserved for at least 260-280 million years.

dc.publisherElsevier
dc.titleStable hydrogen isotopic composition of hydrocarbons in torbanites (Late Carboniferous to Late Permian) deposited under various climatic conditions
dc.typeJournal Article
dcterms.source.volume35
dcterms.source.number2
dcterms.source.startPage189
dcterms.source.endPage197
dcterms.source.issn0146-6380
dcterms.source.titleOrganic Geochemistry
curtin.note

The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/476/description#description

curtin.note

Copyright © 2004 Elsevier Ltd. All rights reserved

curtin.accessStatusFulltext not available
curtin.facultyDepartment of Applied Chemistry
curtin.facultySchool of Science
curtin.facultyFaculty of Science and Engineering


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