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Science 14 July 1995:
Vol. 269. no. 5221, pp. 216 - 218
DOI: 10.1126/science.269.5221.216
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Articles

Flotation of Diamond in Mantle Melt at High Pressure

Akio Suzuki 1, Eiji Ohtani 1, and Takumi Kato 1

1 Institute of Mineralogy, Petrology, and Economic Geology, Tohoku University, Sendai 980, Japan

Experiments show that diamond floats in a primitive mantle melt at around 20 gigapascals and 2360°C and in a melt formed by partial melting of the transition zone at about 16 gigapascals and 2270°C. These observations constrain magma densities at high pressure. Diamond precipitated or trapped in a silicate melt at the base of the transition zone or the lower mantle floats and has been accumulating in the transition zone since early in Earth's history. Thus, the transition zone could be a reservoir of diamond.

Submitted on February 28, 1995
Accepted on May 18, 1995


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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