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dc.contributor.authorMackey, T.J.en_NZ
dc.contributor.authorSumner, D.Y.en_NZ
dc.contributor.authorHawes, Ianen_NZ
dc.contributor.authorLeidman, S.Z.en_NZ
dc.contributor.authorAndersen, D.T.en_NZ
dc.contributor.authorJungblut, Anne D.en_NZ
dc.date.accessioned2019-11-26T23:55:04Z
dc.date.available2018-01-01en_NZ
dc.date.available2019-11-26T23:55:04Z
dc.date.issued2018en_NZ
dc.identifier.citationMackey, T. J., Sumner, D. Y., Hawes, I., Leidman, S. Z., Andersen, D. T., & Jungblut, A. D. (2018). Stromatolite records of environmental change in perennially ice-covered Lake Joyce, McMurdo Dry Valleys, Antarctica. Biogeochemistry, 137(1-2), 73–92. https://doi.org/10.1007/s10533-017-0402-1en
dc.identifier.issn0168-2563en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/13194
dc.description.abstractCalcite-rich columnar stromatolites grew in perennially ice-covered Lake Joyce in the McMurdo Dry Valleys, Antarctica, during a period of environmental change associated with rising lake level. Stromatolite calcite contains carbon and oxygen isotope records of changes to microbial activity in response to variable light environments and water chemistry through time. The stromatolites grew synchronously with correlative calcite zones. The innermost (oldest) calcite zone has a wide range of δ¹³Ccalcite values consistent with variable photosynthetic effects on local DIC ¹³C/¹²C. Subsequent calcite zones preserve a progressive enrichment in δ¹³Ccalcite values of approximately + 2.6‰ through time, with δ¹³Ccalcite values becoming less variable. This enrichment likely records the removal of ¹²C by photosynthesis from the DIC reservoir over decades, with photosynthetic effects decreasing as light levels became lower and more consistent through time. Mean δ¹⁸Ocalcite values of the innermost calcified zone were at least 1‰ lower than those of the other calcified zones (t test p-level < 0.001). The significant difference in δ¹⁸Ocalcite values between the innermost and other calcified zones could be a product of mixing source waters with different isotopic values associated with the initiation of lake stratification associated with rising lake level. Overall, Lake Joyce stromatolites record significant lateral variability in relative photosynthetic rate and long-lived lake water stratification with microbial modification of the DIC pool. Such processes provide criteria for interpreting microbial activity within polar paleolake deposits and may shed light on variability in lake environments associated with changing climate in the McMurdo Dry Valleys.
dc.format.mimetypeapplication/pdf
dc.language.isoenen_NZ
dc.publisherSpringeren_NZ
dc.rights© Springer International Publishing AG, part of Springer Nature 2017.This is the author's accepted version. The final publication is available at Springer via dx.doi.org/10.1007/s10533-017-0402-1
dc.subjectScience & Technologyen_NZ
dc.subjectLife Sciences & Biomedicineen_NZ
dc.subjectPhysical Sciencesen_NZ
dc.subjectEnvironmental Sciencesen_NZ
dc.subjectGeosciences, Multidisciplinaryen_NZ
dc.subjectEnvironmental Sciences & Ecologyen_NZ
dc.subjectGeologyen_NZ
dc.subjectAntarcticaen_NZ
dc.subjectStromatoliteen_NZ
dc.subjectMicrobial maten_NZ
dc.subjectCarbonateen_NZ
dc.subjectIsotopesen_NZ
dc.subjectBENTHIC MICROBIAL MATSen_NZ
dc.subjectSEAWATER CARBONATE CONCENTRATIONen_NZ
dc.subjectDISSOLVED INORGANIC CARBONen_NZ
dc.subjectTAYLOR VALLEYen_NZ
dc.subjectISOTOPIC COMPOSITIONen_NZ
dc.subjectEAST ANTARCTICAen_NZ
dc.subjectPROGLACIAL LAKEen_NZ
dc.subjectVICTORIA VALLEYen_NZ
dc.subjectOXYGEN ISOTOPESen_NZ
dc.subjectSTABLE-ISOTOPEen_NZ
dc.titleStromatolite records of environmental change in perennially ice-covered Lake Joyce, McMurdo Dry Valleys, Antarcticaen_NZ
dc.typeJournal Article
dc.identifier.doi10.1007/s10533-017-0402-1en_NZ
dc.relation.isPartOfBiogeochemistryen_NZ
pubs.begin-page73
pubs.elements-id215429
pubs.end-page92
pubs.issue1-2en_NZ
pubs.publication-statusPublisheden_NZ
pubs.volume137en_NZ
dc.identifier.eissn1573-515Xen_NZ


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