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Updated: Jun 24, 2026

Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology
Published on: November 5, 2014
Marine dolomite of unusual isotopic composition
Abstract:
A piston core taken off of the coast of Oregon in 358 meters of water contained an indurated calcareous layer composed partly of dolomite with a composition Ca(58.7)Mg(41.3). Dolomites of this chemical composition are typical of the supratidal environment. However, the dolomite has isotopic composition delta0(18) = 5.8 per mille, deltaC(13) = 35.1 per mille relative to the Chicago PDB-I standard. The unusual carbon isotope ratio is similar to that of calcites produced as a byproduct of bacterial breakdown of hydrocarbons.
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