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Nature 411, 536-537 (31 May 2001) | doi:10.1038/35079218
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Earth science: Mantle cookbook calibration
Craig R. Bina
Abstract
Doubts about a fundamental model of the chemistry of Earth's deep interior have now been transmuted into doubts about a standard used to calibrate these studies — gold's equation of state.
The properties of the Earth's mantle change abruptly 660 km below the surface, with sharp rises in both density and the transmission speed of seismic waves created by earthquakes. But in 1998 it was announced that highly sophisticated laboratory experiments1 had failed to confirm this 660 km transition — instead, seeming to place the mineral transformation concerned at 600 km.
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