Trace metal and geochemical variability during 5,500 years in the sediment of Lake Lehmilampi, FinlandVisa övriga samt affilieringar
2010 (Engelska)Ingår i: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 44, nr 4, s. 1025-1038Artikel i tidskrift (Refereegranskat) Published
Abstract [en]
A high-resolution geochemical profilefrom a 5,500-year-old sediment core of Lake Lehmilampiin eastern Finland was analyzed to study longtermtrends and variability in element concentrationsand accumulation rates. The accumulation rates of allstudied elements followed the same trend, respondingto changes in the total sedimentation rate. Concentrationprofiles differed among elements and showedconsiderable variation over time. Principal componentsanalysis (PCA) was used on the concentrationdata to identify groups of elements that have similargeochemical controls. The first principal componentwas influenced by changes in mineral matter accumulation,and it incorporated elements that areassociated with stable allochthonous minerals (suchas Mg, K, Cs, Rb, Li, Ti and Ga), as well as elementsin forms that become diluted when mineral matterincreases (e.g., S, Fe and Mn). The second and thirdprincipal components showed that a large proportionof the variance was accounted for by elements withcontinuously increasing or decreasing concentrationsrelated to pedogenetical development of the catchmentsoil. In the case of Hg, Pb and Cd, however,accumulation rates increased faster at the surface thanis simply accounted for by changes in total sedimentationrates. For Cu, Cr, Ni and Zn, concentrationsincreased over the past 150 years, but there were noindications of a significant addition due to atmosphericdeposition. These elements had more variableconcentrations before the mid nineteenth century thanafter, as did elements that are often used fornormalization. These findings suggest that lakesediments may not properly reflect the history of atmospheric metal deposition in remote areas.
Ort, förlag, år, upplaga, sidor
2010. Vol. 44, nr 4, s. 1025-1038
Nyckelord [en]
Varved sediment, Trace metals, Geochemistry, Mineral matter accumulation, Anthropogenic deposition
Nationell ämneskategori
Miljövetenskap
Forskningsämne
Miljövetenskap, Miljökemi; Naturvetenskap, Miljövetenskap
Identifikatorer
URN: urn:nbn:se:lnu:diva-6279DOI: 10.1007/s10933-010-9471-zISI: 000283360800010Scopus ID: 2-s2.0-78049313632OAI: oai:DiVA.org:lnu-6279DiVA, id: diva2:325092
2010-06-172010-06-172022-07-13Bibliografiskt granskad
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