Impact of drill core contamination on compound-specific carbon and hydrogen isotopic signatures
dc.contributor.author | Schinteie, Richard | |
dc.contributor.author | Colangelo-Lillis, Jesse R. | |
dc.contributor.author | Hope, Janet | |
dc.contributor.author | Chen, Junhong | |
dc.contributor.author | Nelson, Daniel B. | |
dc.contributor.author | Jarrett, Amber J. M. | |
dc.contributor.author | Brocks, Jochen | |
dc.date.accessioned | 2020-03-30T23:18:53Z | |
dc.date.issued | 2019 | |
dc.date.updated | 2019-11-25T07:45:50Z | |
dc.description.abstract | Compound-specific carbon and hydrogen isotope ratios are routinely measured on extractable organic matter to decipher biogeochemical processes and events in Earth history. To deliver accurate interpretations, it is paramount that isotopic values are derived from indigenous compounds and are not the result of contamination. However, distinguishing between compounds from these different provenances can be difficult, especially if a degree of mixing occurred. In this study, we assess the impact of hydrocarbon contamination on the carbon and hydrogen isotopic composition of n-alkanes from ∼820 Ma Precambrian evaporitic drill core samples through exterior/interior (E/I) rock extraction experiments. In these experiments, exterior and interior portions of the same rock samples were separately crushed to powder, extracted and processed. Compound-specific isotope values of n-alkanes from the different rock portions were subsequently measured and compared. In most cases, n-alkanes from exterior rock portions had consistently more depleted δ13C and δ2H values than their interior counterparts with an E/I isotopic offset averaging 0.1–6.9‰ for δ13C and 2–33‰ for δ2H. These diverging isotope patterns tend to correspond to E/I concentration differences of n-alkanes and are the result of contaminants overprinting on indigenous isotopic signals. Through the application of E/I experiments, the degree of isotopic overprinting can be investigated and mixed indigenous/contaminant signals identified. | en_AU |
dc.description.sponsorship | This work was financially supported by Australian Research Council grants DP0557499, DP0771043 and DP1095247 to J.J. Brocks | en_AU |
dc.format.mimetype | application/pdf | en_AU |
dc.identifier.issn | 0146-6380 | en_AU |
dc.identifier.uri | http://hdl.handle.net/1885/202515 | |
dc.language.iso | en_AU | en_AU |
dc.publisher | Elsevier | en_AU |
dc.relation | http://purl.org/au-research/grants/arc/DP0557499 | en_AU |
dc.relation | http://purl.org/au-research/grants/arc/DP0771043 | en_AU |
dc.relation | http://purl.org/au-research/grants/arc/DP1095247 | en_AU |
dc.rights | © 2019 Elsevier Ltd. | en_AU |
dc.source | Organic Geochemistry | en_AU |
dc.title | Impact of drill core contamination on compound-specific carbon and hydrogen isotopic signatures | en_AU |
dc.type | Journal article | en_AU |
local.bibliographicCitation.lastpage | 171 | en_AU |
local.bibliographicCitation.startpage | 161 | en_AU |
local.contributor.affiliation | Schinteie, Richard, College of Science, ANU | en_AU |
local.contributor.affiliation | Colangelo-Lillis, Jesse R., University of Colorado at Boulder | en_AU |
local.contributor.affiliation | Hope, Janet, College of Science, ANU | en_AU |
local.contributor.affiliation | Chen, Junhong, Geoscience Australia | en_AU |
local.contributor.affiliation | Nelson, Daniel B., University of Washington | en_AU |
local.contributor.affiliation | Jarrett, Amber J. M., Geoscience Australia | en_AU |
local.contributor.affiliation | Brocks, Jochen, College of Science, ANU | en_AU |
local.contributor.authoremail | repository.admin@anu.edu.au | en_AU |
local.contributor.authoruid | Schinteie, Richard, u4366819 | en_AU |
local.contributor.authoruid | Hope, Janet, u4436008 | en_AU |
local.contributor.authoruid | Brocks, Jochen, u4240521 | en_AU |
local.description.embargo | 2037-12-31 | |
local.description.notes | Imported from ARIES | en_AU |
local.identifier.absfor | 040204 - Organic Geochemistry | en_AU |
local.identifier.absseo | 970105 - Expanding Knowledge in the Environmental Sciences | en_AU |
local.identifier.ariespublication | u3102795xPUB717 | en_AU |
local.identifier.citationvolume | 128 | en_AU |
local.identifier.doi | 10.1016/j.orggeochem.2019.01.003 | en_AU |
local.identifier.scopusID | 2-s2.0-85061013806 | |
local.identifier.uidSubmittedBy | u3102795 | en_AU |
local.publisher.url | https://www.elsevier.com/ | en_AU |
local.type.status | Published Version | en_AU |
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