Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution
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 th...
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ftunisfloridatam:oai:digitalcommons.usf.edu:kip_articles-8223 2023-12-10T09:47:37+01:00 Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution Bajo, Petra Borsato, Andrea Drysdale, Russell Hua, Quan 2017-01-01T08:00:00Z https://digitalcommons.usf.edu/kip_articles/7223 https://doi.org/10.1016/j.gca.2017.04.038 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/kip_articles/7223 doi:10.1016/j.gca.2017.04.038 https://doi.org/10.1016/j.gca.2017.04.038 KIP Articles text 2017 ftunisfloridatam https://doi.org/10.1016/j.gca.2017.04.038 2023-11-16T19:07:43Z 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. Text Carbonic acid Digital Commons University of South Florida (USF) Geochimica et Cosmochimica Acta 210 208 227 |
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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. |
format |
Text |
author |
Bajo, Petra Borsato, Andrea Drysdale, Russell Hua, Quan |
spellingShingle |
Bajo, Petra Borsato, Andrea Drysdale, Russell Hua, Quan Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution |
author_facet |
Bajo, Petra Borsato, Andrea Drysdale, Russell Hua, Quan |
author_sort |
Bajo, Petra |
title |
Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution |
title_short |
Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution |
title_full |
Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution |
title_fullStr |
Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution |
title_full_unstemmed |
Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: An interplay between sulphuric and carbonic acid dissolution |
title_sort |
stalagmite carbon isotopes and dead carbon proportion (dcp) in a near-closed-system situation: an interplay between sulphuric and carbonic acid dissolution |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2017 |
url |
https://digitalcommons.usf.edu/kip_articles/7223 https://doi.org/10.1016/j.gca.2017.04.038 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
KIP Articles |
op_relation |
https://digitalcommons.usf.edu/kip_articles/7223 doi:10.1016/j.gca.2017.04.038 https://doi.org/10.1016/j.gca.2017.04.038 |
op_doi |
https://doi.org/10.1016/j.gca.2017.04.038 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
210 |
container_start_page |
208 |
op_container_end_page |
227 |
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1784891301157666816 |