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Title: Diatom and stable isotope records of late-Holocene lake ontogeny at Indrepollen, Lofoten, NW Norway: a response to glacio-isostasy and Neoglacial cooling
Authors: Mills, Keely
Mackay, Anson W.
Bradley, Raymond S.
Finney, Bruce
Keywords: Diatoms
Stable isotopes
Lake ontogeny
Land uplift
Late Holocene
Issue Date: 2009
Publisher: © SAGE Publications
Citation: MILLS, K. ... et al., 2009. Diatom and stable isotope records of late-Holocene lake ontogeny at Indrepollen, Lofoten, NW Norway: a response to glacio-isostasy and Neoglacial cooling. Holocene, 19 (2), pp. 261 - 271.
Abstract: Borg Indrepollen is a coastal lake on the island of Vestvågøy, Lofoten, NW Norway. A sedimentary sequence spanning the last 4500 cal. yr BP was analysed for diatom, C/N and stable isotopes (δ13C and δ15 N). The record provides clear evidence of glacio-isostatic rebound in the Lofoten region. Five distinct lithostratigraphic-geochemical zones (I—V) and four major diatom zones (A—D) were identified. The early record (I—III, A—Biii; 4500—550 cal. yr BP) contains coarse sedimentary material and diatoms indicative of more marine conditions. The correlation between the isotopic data (high δ13C and low C/N) and trends in the biological data (marine/brackish flora) suggest the marine influence on the Indrepollen basin is a controlling factor of the source of organic material. The latter part of the record (IV, C; 550 cal. yr 550—226) indicates a transitional phase from marine-dominated diatom to brackish taxa and is coincident with a section of microlaminations in the core. The youngest zone (V, D; 226 cal. yr BP—present) is indicative of an isolated basin, with the deposition of fine sediments; freshwater diatom taxa dominate the biological record and δ13C are indicative of freshwater conditions. C/N suggests a shift to a terrestrial source of organic matter. The proxies show a transition from full marine conditions, when Indrepollen was a submerged fjord, to more freshwater, lacustrine conditions in the last 200 years. The record of land uplift from Borg Indrepollen mirrors changes in sedimentary records from across Northern Norway and relative sea-level curves for the region.
Description: This article was published in the Holocene [© SAGE Publications] and the definitive version is available at: http://dx.doi.org/10.1177/0959683608100571
Version: Accepted for publication
DOI: 10.1177/0959683608100571
URI: https://dspace.lboro.ac.uk/2134/13003
Publisher Link: http://dx.doi.org/10.1177/0959683608100571
ISSN: 0959-6836
Appears in Collections:Published Articles (Geography and Environment)

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