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Science 19 June 1970:
Vol. 168. no. 3938, pp. 1451 - 1453
DOI: 10.1126/science.168.3938.1451
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Articles

High-Magnesian Calcite: Leaching of Magnesium in the Deep Sea

David N. Gomberg 1 and Enrico Bonatti 1

1 University of Miami, Rosenstiel School of Marine and Atmospheric Sciences, Miami, Florida 33149

The high-magnesian calcite fraction of a shallow-water carbonate sand was converted to low-magnesian calcite after transport to the deep sea; strontium was also leached from the carbonate. Oxygen isotopic ratios indicate that loss of magnesium and strontium took place during recrystallization of the carbonate in the deep sea; this process did not alter textures of skeletal fragments. Previously, high-magnesian, calcite was thought only to dissolve in the deep sea.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)