Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution

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dc.contributor.authorBajo, Pen_AU
dc.contributor.authorBorsato, Aen_AU
dc.contributor.authorDrysdale, RNen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorFrisia, Sen_AU
dc.contributor.authorZanchetta, Gen_AU
dc.contributor.authorHellstrom, JCen_AU
dc.contributor.authorWoodhead, JDen_AU
dc.date.accessioned2021-07-28T01:56:00Zen_AU
dc.date.available2021-07-28T01:56:00Zen_AU
dc.date.issued2017-08-01en_AU
dc.date.statistics2021-07-15en_AU
dc.description.abstractIn this study, the ‘dead carbon proportion’ (DCP) calculated from combined U-Th and radiocarbon analyses was used to explore the carbon isotope systematics in Corchia Cave (Italy) speleothems, using the example of stalagmite CC26 which grew during the last ∼12 ka. The DCP values in CC26 are among the highest ever recorded in a stalagmite, spanning the range 44.8–68.8%. A combination of almost closed-system conditions and sulphuric acid dissolution (SAD) are proposed as major drivers in producing such a high DCP with minor contribution from old organic matter from the deep vadose zone. The long-term decrease in both DCP and δ13C most likely reflects post-glacial soil recovery above the cave, with a progressive increase of soil CO2 contribution to the total dissolved inorganic carbon (DIC). Pronounced millennial-scale shifts in DCP and relatively small coeval but antipathetic changes in δ13C are modulated by the effects of hydrological variability on open and closed-system dissolution, SAD and prior calcite precipitation. Hence, the DCP in Corchia Cave speleothems represents an additional proxy for rainfall amount. © 2017 Elsevier Ltd.en_AU
dc.identifier.citationBajo, P., Borsato, A., Drysdale, R., Hua, Q., Frisia, S., Zanchetta, G., Hellstrom, J. & Woodhead, J. (2017). Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution. Geochimica et Cosmochimica Acta, 210, 208-227. doi:10.1016/j.gca.2017.04.038en_AU
dc.identifier.issn0016-7037en_AU
dc.identifier.journaltitleGeochimica et Cosmochimica Actaen_AU
dc.identifier.pagination208-227en_AU
dc.identifier.urihttps://doi.org/10.1016/j.gca.2017.04.038en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11131en_AU
dc.identifier.volume210en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectInorganic acidsen_AU
dc.subjectCarbonic aciden_AU
dc.subjectCarbon 14en_AU
dc.subjectCarbon isotopesen_AU
dc.subjectStable isotopesen_AU
dc.subjectCavesen_AU
dc.titleStalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolutionen_AU
dc.typeJournal Articleen_AU
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