Pressure-induced amorphization of albitic plagioclase in an externally heated diamond anvil cell

Details Pressure-induced amorphization of albitic plagioclase in an externally heated diamond anvil cell Pressure-induced amorphization of albitic plagioclase in an externally heated diamond anvil cell

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3721301t&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 21, CiteID L21301

Physics

Mineral Physics: High-Pressure Behavior, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Planetary Sciences: Comets And Small Bodies: Impact Phenomena (5420, 8136), Mineralogy And Petrology: Meteorite Mineralogy And Petrology (1028, 6240)

Scientific paper

High-pressure and high-temperature experiments of albitic plagioclase up to 41 GPa and 270 °C were carried out using an externally heated diamond anvil cell. Raman spectroscopy and transmission electron microscopy of the recovered samples revealed that the amorphization of albite was complete at ˜37 GPa and room temperature. The amorphization pressure at 170 °C was nearly the same as that at room temperature. In contrast, the pressure largely decreased to ˜31 GPa at 270 °C. In comparison with the amorphization pressure of albite in laboratory shock experiments, that in the present static compression experiments is significantly lower (>10 GPa) even at room temperature. This suggests that shorter pressure duration results in a lower degree of amorphization of plagioclase. The formation of maskelynite in shocked meteorites does not necessarily require the very high shock pressure (30-90 GPa) that was previously estimated on the basis of shock recovery experiments.

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