Solidus of Earth's deep mantle

Science

Volumn 281, Issue 5374, 1998, Pages 243-246

  Zerr, A ^a   Diegeler, A ^b   Boehler, R ^a  

^a MAX PLANCK INSTITUTE FOR CHEMISTRY   (Germany)

^b UNIVERSITY OF COLOGNE   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

CORE-MANTLE BOUNDARY; LOWER MANTLE; PARTIAL MELTING; PYROLITE; SOLIDUS;

ARTICLE; CARBON DIOXIDE LASER; GEOLOGY; MELTING POINT; PRIORITY JOURNAL;

EID: 0032504131     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.281.5374.243     Document Type: Article

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13. 2 laser (90% TEM00) was used for heating. The small sample thickness and the effective thermal insulation of the sample from the diamond by the argon pressure medium allowed defocusing of the laser beam to reach high temperatures with small axial and radial gradients. Large portions of the samples were thus converted to high-pressure minerals from the glass starting material without scanning the laser beam. Thermal radiation spectra were recorded from areas 2 to 3 μm in diameter with a charge-coupled device detector in the wavelength range 500 to 815 nm, and Planck's radiation function was fitted to the spectra. The emissivity of the sample was taken to be independent of wavelength. The temperature uncertainty based on this assumption is about ±150 K (2). The temperatures reported in this work are maximum temperatures in the center of the laser-heated spot.
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