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dc.contributor.authorPearson, Michael J.
dc.contributor.authorGrosjean, Emmanuelle
dc.contributor.authorNelson, Campbell S.
dc.contributor.authorNyman, Stephanie Leigh
dc.contributor.authorLogan, Graham A.
dc.date.accessioned2010-07-05T02:07:48Z
dc.date.available2010-07-05T02:07:48Z
dc.date.issued2010
dc.identifier.citationPearson, M.J., Grosjean, E., Nelson, C.S., Nyman, S.L. & Logan, G.A. (2010). Tubular concretions in New Zealand petroliferous basins: Lipid biomarker evidence for mineralisation around proposed miocene hydrocarbon seep conduits. Journal of Petroleum Geology, 33(3), 205-219.en_NZ
dc.identifier.urihttp://hdl.handle.net/10289/4091
dc.description.abstractTrapped organic compounds (lipids) have been analysed in tubular carbonate concretions and their host sediments in Miocene deep water mudrocks from coastal outcrops in East Coast Basin and Taranaki Basin of North Island, New Zealand. The concretions, including calcitic, dolomitic and mixed mineralogies, have varied morphologies in many cases suggestive of conduits or pipes that channelled the escape of subsurface fluids and/or hydrocarbon gases. The extracted lipids include water column and/or diagenetically-derived alkanes, fatty acids and alcohols as well as specific marker compounds (including archaeal pentamethylicosane (PMI) and archaeol) associated with subsurface anaerobic oxidation of upwardly seeping methane gas (AOM). Strong carbon-13 isotopic depletions (δ13C –75 to –120‰) measured for PMI, archaeol and other AOM-specific marker compounds on three concretion samples support involvement of AOM in generating bicarbonate-rich fluid that was at least partly responsible for cementing the pipe-like concretions and central conduits. Other morphological types appear not to be AOM-related. Sterane and n-alkane parameters indicate low thermal maturity of the extracted organic matter. The molecular and compound specific isotopic organic geochemical evidence that some tubular concretions functioned as methane conduits thus supports an assertion that the tubular concretions represent 'fossilised' parts of the subsurface plumbing of biogenic or thermogenic hydrocarbon-fed cold seep systems.en_NZ
dc.language.isoen
dc.publisherWiley-Blackwellen_NZ
dc.subjectTubular concretionen_NZ
dc.subjectcold seepen_NZ
dc.subjectlipiden_NZ
dc.subjectarchaeaen_NZ
dc.subjectmethaneen_NZ
dc.subjectcarbonateen_NZ
dc.subjectcalciteen_NZ
dc.subjectdolomiteen_NZ
dc.subjectAOMen_NZ
dc.subjectNew Zealanden_NZ
dc.titleTubular concretions in New Zealand petroliferous basins: Lipid biomarker evidence for mineralisation around proposed miocene hydrocarbon seep conduitsen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.1111/j.1747-5457.2010.00474.xen_NZ
dc.relation.isPartOfJournal of Petroleum Geologyen_NZ
pubs.begin-page205en_NZ
pubs.elements-id35029
pubs.end-page220en_NZ
pubs.issue3en_NZ
pubs.volume33en_NZ


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