Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/11131
Title: Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution
Authors: Bajo, P
Borsato, A
Drysdale, R
Hua, Q
Frisia, S
Zanchetta, G
Hellstrom, JC
Woodhead, J
Keywords: Inorganic acids
Carbonic acid
Carbon 14
Carbon isotopes
Stable isotopes
Caves
Issue Date: 1-Aug-2017
Publisher: Elsevier
Citation: Bajo, 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.2017.04.038
Abstract: In 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.
URI: https://doi.org/10.1016/j.gca.2017.04.038
https://apo.ansto.gov.au/dspace/handle/10238/11131
ISSN: 0016-7037
Appears in Collections:Journal Articles

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