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Diatom preservation: experiments and observations on dissolution and breakage in modern and fossil material

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Abstract

Selected aspects of diatom preservation in both laboratory and field environments are examined with a view to improving techniques and to help understand why only some lake sediments have good diatom preservation.

Laboratory measurements of biogenic silica following diatom dissolution by alkali digestion are questioned because results are shown to be dependant on initial sample size. Diatom breakage experiments identified drying carbonate rich sediment as a major cause of fragmentation of the large robust diatom Campylodiscus clypeus Ehrenb. Diatom dissolution experiments in carbonate media indicated that carbonate rich lakes should preserve diatoms better in order of the particular alkali metal type (Ca > Mg > Na). A preliminary assessment of the role of depth in diatom preservation is made for Lake Baikal where partly dissolved Cyclotella are more common in deep water surface sediments. The effect of time on diatom dissolution is examined in a saline lake sediment core and by comparing dissolution rates of recent and geologically old diatom samples in the laboratory. A simple link between diatom dissolution and sample age was not established. Factors thought to be important in controlling diatom preservation in lake sediments are discussed.

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  1. Environmental Change Research Centre, University College London, 26 Bedford Way, WC1 H OAP, London, UK

    Roger J. Flower

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Flower, R.J. Diatom preservation: experiments and observations on dissolution and breakage in modern and fossil material. Hydrobiologia 269, 473–484 (1993). https://doi.org/10.1007/BF00028045

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