Nucleation and growth of Mg-bearing calcite in a shallow, calcareous lake

Ilona Nyirő-Kósa, Ágnes Rostási, Éva Bereczk-Tompa, Ildikó Cora, Maja Koblar, András Kovács, M. Pósfai

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Both inorganic and microbial processes play important roles in carbonate mineral precipitation in freshwater lakes. Identifying the individual factors that determine particle size, shape, composition, and the spatial relationships of carbonates with other constituents of the sediment are important for understanding sediment formation and nutrient cycling, and for providing input for lake management planning. We studied the formation of Mg-bearing calcite in Lake Balaton, a large, shallow, Mg-rich, calcareous lake in Hungary, by filtering particles from the water and analyzing them using X-ray powder diffraction and electron microscopy techniques. Mg-bearing calcite particles from Lake Balaton have distinct and remarkably consistent morphologies, independent of seasonal and annual variations in water temperature and composition. They are typically elongated parallel to the [001] crystallographic direction, are about 4 to 8 μm long, and even though appear to be composed of many smaller units, electron diffraction patterns indicate they are perfect single crystals. The Mg content of calcite increases from west to east, reflecting a gradient in lakewater composition. The calcite crystals are invariably attached to nm-scale flakes of smectite, suggesting that the clay mineral serves as a nucleation site. The templated nucleation may direct the growth of calcite parallel to the clay flakes, resulting in its elongated shape and single crystalline character. While in deep, oligotrophic lakes calcite typically nucleates on picoplankton cells, we rarely observe this phenomenon in Lake Balaton. Because of the shallowness of the lake, sediments are stirred up by even moderate winds and the movement of organisms, making nm-scale smectite flakes readily available for templating calcite nucleation. Thus, while calcite precipitation is an indirect consequence of biological activity (photosynthesis), the physical properties of the particles are primarily determined by inorganic factors.

Original languageEnglish
Pages (from-to)20-28
Number of pages9
JournalEarth and Planetary Science Letters
Volume496
DOIs
Publication statusPublished - Aug 15 2018

Fingerprint

Bearings (structural)
Calcium Carbonate
calcite
lakes
nucleation
Lakes
Nucleation
lake
flakes
Sediments
sediments
annual variations
montmorillonite
smectite
clays
carbonates
management planning
Chemical analysis
minerals
Carbonate minerals

Keywords

  • crystal size and shape control
  • Lake Balaton
  • Mg-bearing calcite
  • smectite
  • templated nucleation

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Nyirő-Kósa, I., Rostási, Á., Bereczk-Tompa, É., Cora, I., Koblar, M., Kovács, A., & Pósfai, M. (2018). Nucleation and growth of Mg-bearing calcite in a shallow, calcareous lake. Earth and Planetary Science Letters, 496, 20-28. https://doi.org/10.1016/j.epsl.2018.05.029

Nucleation and growth of Mg-bearing calcite in a shallow, calcareous lake. / Nyirő-Kósa, Ilona; Rostási, Ágnes; Bereczk-Tompa, Éva; Cora, Ildikó; Koblar, Maja; Kovács, András; Pósfai, M.

In: Earth and Planetary Science Letters, Vol. 496, 15.08.2018, p. 20-28.

Research output: Contribution to journalArticle

Nyirő-Kósa, I, Rostási, Á, Bereczk-Tompa, É, Cora, I, Koblar, M, Kovács, A & Pósfai, M 2018, 'Nucleation and growth of Mg-bearing calcite in a shallow, calcareous lake', Earth and Planetary Science Letters, vol. 496, pp. 20-28. https://doi.org/10.1016/j.epsl.2018.05.029
Nyirő-Kósa I, Rostási Á, Bereczk-Tompa É, Cora I, Koblar M, Kovács A et al. Nucleation and growth of Mg-bearing calcite in a shallow, calcareous lake. Earth and Planetary Science Letters. 2018 Aug 15;496:20-28. https://doi.org/10.1016/j.epsl.2018.05.029
Nyirő-Kósa, Ilona ; Rostási, Ágnes ; Bereczk-Tompa, Éva ; Cora, Ildikó ; Koblar, Maja ; Kovács, András ; Pósfai, M. / Nucleation and growth of Mg-bearing calcite in a shallow, calcareous lake. In: Earth and Planetary Science Letters. 2018 ; Vol. 496. pp. 20-28.
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