The dissolution kinetics of biogenic calcium carbonates in seawater

Details The dissolution kinetics of biogenic calcium carbonates in seawater The dissolution kinetics of biogenic calcium carbonates in seawater

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44..241k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 44, Issue 2, pp.241-252

Physics

34

Scientific paper

Dissolution rate as a function of degree of undersaturation was measured on shells of individual species of coccoliths and foraminifera, various size fractions of sediment from the Ontong-Java Plateau and the Rio Grande Rise, a collection of large pteropods, and on synthetic calcite and aragonite powder. Results of the study indicate that all biogenic and synthetic calcium carbonate follows the rate law R % = k %(1 - ) n where [ Ca 2+ ][ CO 3 2- ]/ K ' sp and K ' sp is the apparent solubility product of calcite or aragonitic seawater. In the case of all calcite samples, n c = 4.5, while for aragonitic samples n a = 4.2. The `rate constant', k %, varies widely between samples and in many cases is inversely correlated with grain size. However, the individual species of coccoliths, E. huxleyi and C. neohelis , which were cultured in the laboratory appear not to follow this rule, with dissolution rates an order to magnitude lower than expected.

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