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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ftunivnewcastnsw:uon:30183 2023-05-15T15:52:46+02:00 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 Frisia, Silvia Zanchetta, Giovanni Hellstrom, John Woodhead, Jon The University of Newcastle. Faculty of Science, School of Environmental and Life Sciences 2017 http://hdl.handle.net/1959.13/1348299 eng eng Pergamon Press ARC.DP160101058 and ARC FT130100801 http://purl.org/au-research/grants/arc/FT130100801 Geochimica et Cosmochimica Acta Vol. 210, p. 208-227 10.1016/j.gca.2017.04.038 speleothem dead carbon proportion (DCP) stable isotope ratios of carbon (δ¹³C) sulfuric acid dissolution Corchia Cave journal article 2017 ftunivnewcastnsw 2018-07-27T00:55:40Z 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 CO 2 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. Article in Journal/Newspaper Carbonic acid NOVA: The University of Newcastle Research Online (Australia) |
institution |
Open Polar |
collection |
NOVA: The University of Newcastle Research Online (Australia) |
op_collection_id |
ftunivnewcastnsw |
language |
English |
topic |
speleothem dead carbon proportion (DCP) stable isotope ratios of carbon (δ¹³C) sulfuric acid dissolution Corchia Cave |
spellingShingle |
speleothem dead carbon proportion (DCP) stable isotope ratios of carbon (δ¹³C) sulfuric acid dissolution Corchia Cave Bajo, Petra Borsato, Andrea Drysdale, Russell Hua, Quan Frisia, Silvia Zanchetta, Giovanni Hellstrom, John Woodhead, Jon Stalagmite carbon isotopes and dead carbon proportion (DCP) in a near-closed-system situation: an interplay between sulphuric and carbonic acid dissolution |
topic_facet |
speleothem dead carbon proportion (DCP) stable isotope ratios of carbon (δ¹³C) sulfuric acid dissolution Corchia Cave |
description |
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 CO 2 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. |
author2 |
The University of Newcastle. Faculty of Science, School of Environmental and Life Sciences |
format |
Article in Journal/Newspaper |
author |
Bajo, Petra Borsato, Andrea Drysdale, Russell Hua, Quan Frisia, Silvia Zanchetta, Giovanni Hellstrom, John Woodhead, Jon |
author_facet |
Bajo, Petra Borsato, Andrea Drysdale, Russell Hua, Quan Frisia, Silvia Zanchetta, Giovanni Hellstrom, John Woodhead, Jon |
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 |
Pergamon Press |
publishDate |
2017 |
url |
http://hdl.handle.net/1959.13/1348299 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
ARC.DP160101058 and ARC FT130100801 http://purl.org/au-research/grants/arc/FT130100801 Geochimica et Cosmochimica Acta Vol. 210, p. 208-227 10.1016/j.gca.2017.04.038 |
_version_ |
1766387861893939200 |