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Validating a Swedish varve chronology using radiocarbon, palaeomagnetic secular variation, lead pollution history and statistical correlation
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology (INK).
2010 (Swedish)In: Quaternary Geochronology, ISSN 1871-1014, Vol. 5, 611-624 p.Article in journal (Refereed) Published
Abstract [en]

We use statistical correlation of palaeomagnetic secular variation (PSV) curves from a varved Holocene lake sediment sequence in west central Sweden (Lake Kälksjön) against those of a Fennoscandian master stack (FENNOSTACK) to correct for an apparent error in the varve chronology. Additional correlation between a lead pollution-derived chronology for the last 2000 years corroborates the PSV results. Use of the FENNOSTACK palaeomagnetic master curve reveals no significant difference in duration between large-scale features from 2500 to 8000 cal. yrs BP. Statistical correlation, however, implies that 270 years are missing from the younger part (<1000 cal. yrs BP) of the varve chronology, and that there is an overestimation by approximately 230 years in the number of varves counted in the early Holocene (>8000 cal. yrs BP). A similar comparison between the PSV-determined ages and calibrated bulk radiocarbon ages suggests that the sediments of mid-Holocene age contain substantial amounts of old carbon, probably of soil origin, which causes bulk sediment-calibrated mean 14C ages to be up to 850 years older than the corrected varve chronology, which extends to 9193 ± 186 cal. yrs BP. This study highlights both the use of statistical correlation as a technique for detecting errors between chronologies, and the importance of validating incremental chronologies with more than one independent method.

Place, publisher, year, edition, pages
2010. Vol. 5, 611-624 p.
National Category
Geology
Research subject
Quarternary Geology
Identifiers
URN: urn:nbn:se:su:diva-53760DOI: 10.1016/j.quageo2010.03.004OAI: oai:DiVA.org:su-53760DiVA: diva2:391255
Funder
Swedish Research Council, 2006-5868
Available from: 2011-01-24 Created: 2011-01-24 Last updated: 2011-01-24Bibliographically approved

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CiteExportLink to record
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  • apa
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