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Verfasst von:Lechleitner, Franziska Anna [VerfasserIn]   i
 Fohlmeister, Jens [VerfasserIn]   i
 McIntyre, Cameron [VerfasserIn]   i
 Baldini, Lisa M. [VerfasserIn]   i
 Jamieson, Robert A. [VerfasserIn]   i
 Hercman, Helena [VerfasserIn]   i
 Gąsiorowski, Michał [VerfasserIn]   i
 Pawlak, Jacek [VerfasserIn]   i
 Stefaniak, Krzysztof [VerfasserIn]   i
 Socha, Paweł [VerfasserIn]   i
 Eglinton, Timothy I. [VerfasserIn]   i
 Baldini, James U. L. [VerfasserIn]   i
Titel:A novel approach for construction of radiocarbon-based chronologies for speleothems
Verf.angabe:Franziska A. Lechleitner, Jens Fohlmeister, Cameron McIntyre, Lisa M. Baldini, Robert A. Jamieson, Helena Hercman, Michał Gąsiorowski, Jacek Pawlak, Krzysztof Stefaniak, Paweł Socha, Timothy I. Eglinton, James U. L. Baldini
E-Jahr:2016
Jahr:3 June 2016
Umfang:13 S.
Fussnoten:Gesehen am 17.06.2020
Titel Quelle:Enthalten in: Quaternary geochronology
Ort Quelle:Amsterdam [u.a.] : Elsevier, 2006
Jahr Quelle:2016
Band/Heft Quelle:35(2016), Seite 54-66
ISSN Quelle:1871-1014
Abstract:Robust chronologies are crucial for the correct interpretation of climate proxy records and for detailed reconstructions of palaeoclimate. Stalagmites have garnered strong interest as recorders of past climate in part due to their amenability to U-series dating. However, many stalagmites are not dateable using this technique due to low 238U and/or high detrital Th concentrations (e.g., many tropical cave systems (Adkins et al., 2013)), and occasionally these issues affect stalagmites across wide geographical regions (e.g., large parts of Australia (Green et al. 2013)) complicating the use of stalagmites in these areas. Radiocarbon (14C) offers an alternative method of dating stalagmites, but issues associated with the ‘dead carbon fraction’ (DCF) have historically hindered this approach. Here, a novel 14C-based method for dating stalagmites is presented and discussed. The technique calculates a best-fit growth rate between a time-series of stalagmite 14C data and known atmospheric 14C variability. The new method produces excellent results for stalagmites that satisfy four requirements: i) the absence of long-term secular variability in DCF (i.e., stalagmite DCF varies around a mean value with no long-term trend), ii) stalagmite growth rate does not vary significantly (the technique identifies stalagmites with substantial growth rate variability), iii) the stalagmite record is long enough that measurable 14C decay has occurred, and iv) one ‘anchor’ point exists where the calendar age is known. The model produces good results for a previously U-Th dated stalagmite from Heshang Cave, China, and is then applied to an undated stalagmite from southern Poland. The new method will not replace high-precision U-Th measurements, because the precision of the technique is difficult to quantify. However, it provides a means for dating certain stalagmites undateable by conventional U-Th methods and for refining coarse U-Th chronologies.
DOI:doi:10.1016/j.quageo.2016.05.006
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1016/j.quageo.2016.05.006
 Volltext: http://www.sciencedirect.com/science/article/pii/S1871101416300577
 DOI: https://doi.org/10.1016/j.quageo.2016.05.006
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:Age modelling
 Radiocarbon
 Radiocarbon dating
 Stalagmite
K10plus-PPN:1700719890
Verknüpfungen:→ Zeitschrift

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