Geophysics

Making mantle melt analogs more accurate

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Science  29 Aug 2014:
Vol. 345, Issue 6200, pp. 1017
DOI: 10.1126/science.345.6200.1017-d
Hot-compressed glass structure CREDIT: D. B. GHOSH ET AL. AMERICAN MINERALOGIST 99 (JULY 2014) © MINERALOGICAL SOCIETY OF AMERICA

Glasses, which can be thought of as “frozen” liquids, often are used as a proxy to study the properties of silicate melts in Earth's mantle. Glasses can be studied at temperatures and pressures lower than those found deep underground, which are impossible to achieve in the lab. Ghosh et al. conduct computational analyses to show that temperature is important in determining the properties of glass. Glass compressed at high temperature can change its structure and become denser than glass compressed at room temperature, making it a better analog for liquid melts generated deep in the mantle.

Am. Mineral. 10.2138/am.2014.4631 (2014).

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