Dating stalagmites in mediterranean climates using annual trace element cycles

Abstract Speleothems may preserve geochemical information at annual resolution, preserving information about past hydrology, environment and climate. In this study, we advance information-extraction from speleothems in two ways. First, the limitations in dating modern stalagmites are overcome by ref...

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Autores principales:	Gurinder Nagra, Pauline C. Treble, Martin S. Andersen, Petra Bajo, John Hellstrom, Andy Baker
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3edffc3609f44110a25a900ac4efbc66
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spelling	oai:doaj.org-article:3edffc3609f44110a25a900ac4efbc662021-12-02T15:05:44ZDating stalagmites in mediterranean climates using annual trace element cycles10.1038/s41598-017-00474-42045-2322https://doaj.org/article/3edffc3609f44110a25a900ac4efbc662017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00474-4https://doaj.org/toc/2045-2322Abstract Speleothems may preserve geochemical information at annual resolution, preserving information about past hydrology, environment and climate. In this study, we advance information-extraction from speleothems in two ways. First, the limitations in dating modern stalagmites are overcome by refining a dating method that uses annual trace element cycles. It is shown that high-frequency variations in elements affected by prior calcite precipitation (PCP) can be used to date speleothems and yield an age within 2–4% chronological uncertainty of the actual age of the stalagmite. This is of particular relevance to mediterranean regions that display strong seasonal controls on PCP, due to seasonal variability in water availability and cave-air pCO2. Second, using the chronology for one stalagmite sample, trace elements and growth-rate are compared with a record of climate and local environmental change i.e. land-use and fire, over the 20th century. Well-defined peaks in soil-derived trace elements and simultaneous decreases in growth-rate coincide with extreme annual rainfall totals in 1934 and 1974. One of which, 1934, was due to a recorded cyclone. We also find that bedrock-derived elements that are dominated by PCP processes, reflect a well-known period of drying in southwest Australia which began in the 1970’s.Gurinder NagraPauline C. TrebleMartin S. AndersenPetra BajoJohn HellstromAndy BakerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Gurinder Nagra Pauline C. Treble Martin S. Andersen Petra Bajo John Hellstrom Andy Baker Dating stalagmites in mediterranean climates using annual trace element cycles
description	Abstract Speleothems may preserve geochemical information at annual resolution, preserving information about past hydrology, environment and climate. In this study, we advance information-extraction from speleothems in two ways. First, the limitations in dating modern stalagmites are overcome by refining a dating method that uses annual trace element cycles. It is shown that high-frequency variations in elements affected by prior calcite precipitation (PCP) can be used to date speleothems and yield an age within 2–4% chronological uncertainty of the actual age of the stalagmite. This is of particular relevance to mediterranean regions that display strong seasonal controls on PCP, due to seasonal variability in water availability and cave-air pCO2. Second, using the chronology for one stalagmite sample, trace elements and growth-rate are compared with a record of climate and local environmental change i.e. land-use and fire, over the 20th century. Well-defined peaks in soil-derived trace elements and simultaneous decreases in growth-rate coincide with extreme annual rainfall totals in 1934 and 1974. One of which, 1934, was due to a recorded cyclone. We also find that bedrock-derived elements that are dominated by PCP processes, reflect a well-known period of drying in southwest Australia which began in the 1970’s.
format	article
author	Gurinder Nagra Pauline C. Treble Martin S. Andersen Petra Bajo John Hellstrom Andy Baker
author_facet	Gurinder Nagra Pauline C. Treble Martin S. Andersen Petra Bajo John Hellstrom Andy Baker
author_sort	Gurinder Nagra
title	Dating stalagmites in mediterranean climates using annual trace element cycles
title_short	Dating stalagmites in mediterranean climates using annual trace element cycles
title_full	Dating stalagmites in mediterranean climates using annual trace element cycles
title_fullStr	Dating stalagmites in mediterranean climates using annual trace element cycles
title_full_unstemmed	Dating stalagmites in mediterranean climates using annual trace element cycles
title_sort	dating stalagmites in mediterranean climates using annual trace element cycles
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/3edffc3609f44110a25a900ac4efbc66
work_keys_str_mv	AT gurindernagra datingstalagmitesinmediterraneanclimatesusingannualtraceelementcycles AT paulinectreble datingstalagmitesinmediterraneanclimatesusingannualtraceelementcycles AT martinsandersen datingstalagmitesinmediterraneanclimatesusingannualtraceelementcycles AT petrabajo datingstalagmitesinmediterraneanclimatesusingannualtraceelementcycles AT johnhellstrom datingstalagmitesinmediterraneanclimatesusingannualtraceelementcycles AT andybaker datingstalagmitesinmediterraneanclimatesusingannualtraceelementcycles
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Dating stalagmites in mediterranean climates using annual trace element cycles

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