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Local paleoenvironmental controls on the carbon-isotope record defining the Bitter Springs Anomaly

Klaebe, R M; Kennedy, M J; Jarrett, Amber; Brocks, Jochen

Description

Large magnitude (>10‰) carbon-isotope (δ13C) excursions recorded in carbonate-bearing sediments are increasingly used to monitor environmental change and constrain the chronology of the critical interval in the Neoproterozoic stratigraphic record that is timed with the first appearance and radiation of metazoan life. The ~10‰ Bitter Springs Anomaly preserved in Tonian-aged (1000–720 Ma) carbonate rocks in the Amadeus Basin of central Australia has been offered as one of the best...[Show more]

dc.contributor.authorKlaebe, R M
dc.contributor.authorKennedy, M J
dc.contributor.authorJarrett, Amber
dc.contributor.authorBrocks, Jochen
dc.date.accessioned2021-08-02T03:59:24Z
dc.identifier.issn1472-4677
dc.identifier.urihttp://hdl.handle.net/1885/242585
dc.description.abstractLarge magnitude (>10‰) carbon-isotope (δ13C) excursions recorded in carbonate-bearing sediments are increasingly used to monitor environmental change and constrain the chronology of the critical interval in the Neoproterozoic stratigraphic record that is timed with the first appearance and radiation of metazoan life. The ~10‰ Bitter Springs Anomaly preserved in Tonian-aged (1000–720 Ma) carbonate rocks in the Amadeus Basin of central Australia has been offered as one of the best preserved examples of a primary marine δ13C excursion because it is regionally reproducible and δ13C values covary in organic and carbonate carbon arguing against diagenetic exchange. However, here we show that δ13C values defining the excursion coincide with abrupt lithofacies changes between regularly cyclic grainstone and microbial carbonates, and desiccated red bed mudstones with interbedded evaporite and dolomite deposits, recording local environmental shifts from restricted marine conditions to alkaline lacustrine and playa settings that preserve negative (−4‰) and positive (+6‰) δ13C values, respectively. The stratigraphic δ13C pattern in both organic and carbonate carbon recurs within the basin in a similar way to associated sedimentary facies, reflecting the linkage of local paleoenvironmental conditions and δ13C values. These local excursions may be time transgressive or record a relative sea-level influence manifest through exposure of sub-basins isolated by sea-level fall below shallow sills, but are independent of secular seawater variation. As the shallow intracratonic setting of the Bitter Springs Formation is typical of other Neoproterozoic carbonate successions used to construct the present δ13C seawater record, it identifies the potential for local influences on δ13C excursions that are neither diagenetic nor representative of the global exogenic cycle.
dc.description.sponsorshipThis work was supported by Australian Research Council grants DP120100104, DP110104367, LP120200086, and Australian Synchrotron beam-time (ref. AS133/XFM/7150) awarded to Kennedy, and DP1095247 awarded to Brocks. Drill core material and imagery provided by the Northern Territory Geological Survey
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Publishing Inc.
dc.rights© 2016 John Wiley & Sons Ltd
dc.sourceGeobiology
dc.titleLocal paleoenvironmental controls on the carbon-isotope record defining the Bitter Springs Anomaly
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume15
dc.date.issued2017
local.identifier.absfor030000 - CHEMICAL SCIENCES
local.identifier.absfor040200 - GEOCHEMISTRY
local.identifier.absfor040300 - GEOLOGY
local.identifier.ariespublicationa383154xPUB4454
local.publisher.urlhttps://www.wiley.com/en-gb
local.type.statusPublished Version
local.contributor.affiliationKlaebe, R M, University of Adelaide
local.contributor.affiliationKennedy, M J, Macquarie University
local.contributor.affiliationJarrett, Amber, College of Science, ANU
local.contributor.affiliationBrocks, Jochen, College of Science, ANU
local.description.embargo2099-12-31
dc.relationhttp://purl.org/au-research/grants/arc/DP120100104
dc.relationhttp://purl.org/au-research/grants/arc/DP110104367
dc.relationhttp://purl.org/au-research/grants/arc/LP120200086
dc.relationhttp://purl.org/au-research/grants/arc/DP1095247
local.bibliographicCitation.issue1
local.bibliographicCitation.startpage65
local.bibliographicCitation.lastpage80
local.identifier.doi10.1111/gbi.12217
dc.date.updated2020-11-23T10:46:00Z
local.identifier.scopusID2-s2.0-84991056217
local.identifier.thomsonID000390195900005
CollectionsANU Research Publications

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