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dc.contributor.authorBajo, P-
dc.contributor.authorBorsato, A-
dc.contributor.authorDrysdale, RN-
dc.contributor.authorHua, Q-
dc.contributor.authorFrisia, S-
dc.contributor.authorZanchetta, G-
dc.contributor.authorHellstrom, JC-
dc.contributor.authorWoodhead, JD-
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_US
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_US
dc.subjectInorganic acidsen_US
dc.subjectCarbonic aciden_US
dc.subjectCarbon 14en_US
dc.subjectCarbon isotopesen_US
dc.subjectStable isotopesen_US
dc.titleStalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolutionen_US
dc.typeJournal Articleen_US
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