The chemistry of lake sediments in time and space

Daniel R. Engstrom, Edward B. Swain

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

Five short cores (1.0-1.5 m) representing different depositional zones of an isolated bay of Lake Minnetonka, Minnesota (USA), were independently dated by 210Pb and pollen analysis and were analyzed stratigraphically for elemental chemistry (following sediment fractionation) and sedimentary pigments (including myxoxanthophyll and oscillaxanthin). Because of good dating control, short-interval time-stratigraphic units could be traced across the basin, and lake-wide accumulation rates and concentrations could be estimated. The accumulation and concentration of each component at a core-site relative to basin-wide averages provide new indices, 'relative accumulation' and 'relative concentration', that are used to evaluate three major processes controlling sediment deposition: (1) the basin-wide flux, (2) the physical redistribution of bulk sediment, and (3) the selective bio-geochemical transport and fossilization of individual sedimentary components within the lake.

Original languageEnglish (US)
Pages (from-to)37-44
Number of pages8
JournalHydrobiologia
Volume143
Issue number1
DOIs
StatePublished - Dec 1 1986

Keywords

  • Pb
  • geochemistry
  • Lake Minnetonka
  • multiple-cores
  • myxoxanthophyll
  • paleolimnology
  • pigments

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