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New insights from XRF core scanning data into boreal lake ontogeny during the Eemian (Marine Isotope Stage 5e) at Sokli, northeast Finland
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
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2018 (English)In: Quaternary Research, ISSN 0033-5894, E-ISSN 1096-0287, Vol. 89, no 1, p. 352-364Article in journal (Refereed) Published
Abstract [en]

Biological proxies from the Sokli Eemian (Marine Isotope Stage 5e) paleolake sequence from northeast Finland have previously shown that, unlike many postglacial records from boreal sites, the lake becomes increasingly eutrophic over time. Here, principal components (PC) were extracted from a high resolution multi-element XRF core scanning dataset to describe minerogenic input from the wider catchment (PC1), the input of S, Fe, Mn, and Ca-rich detrital material from the surrounding Sokli Carbonatite Massif (PC2), and chemical weathering (PC3). Minerogenic inputs to the lake were elevated early in the record and during two abrupt cooling events when soils and vegetation in the catchment were poor. Chemical weathering in the catchment generally increased over time, coinciding with higher air temperatures, catchment productivity, and the presence of acidic conifer species. Abiotic edaphic processes play a key role in lake ontogeny at this site stemming from the base cation- and nutrient-rich bedrock, which supports lake alkalinity and productivity. The climate history at this site, and its integrated effects on the lake system, appear to override development processes and alters its long-term trajectory.

Place, publisher, year, edition, pages
CAMBRIDGE UNIV PRESS , 2018. Vol. 89, no 1, p. 352-364
Keywords [en]
Eemian, XRF core scanning, Geochemistry, Lake sediment, Boreal, Ontogeny
National Category
Physical Geography
Identifiers
URN: urn:nbn:se:umu:diva-145797DOI: 10.1017/qua.2017.84ISI: 000425965700023OAI: oai:DiVA.org:umu-145797DiVA, id: diva2:1192438
Available from: 2018-03-22 Created: 2018-03-22 Last updated: 2018-06-09Bibliographically approved

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Rydberg, Johan

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
  • Other style
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  • de-DE
  • en-GB
  • en-US
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf