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Synchrotron radiation study on the high-pressure and high-temperature phase relations of KAlSi3O8

✍ Scribed by S. Urakawa; T. Kondo; N. Igawa; O. Shimomura; H. Ohno

Publisher: Springer-Verlag
Year: 1994
Tongue: English
Weight: 529 KB
Volume: 21
Category: Article
ISSN: 0342-1791
DOI: 10.1007/bf00203296

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✦ Synopsis

In situ X-ray diffraction study on KA1Si30 a has been performed using the cubic type high pressure apparatus, MAX90, combined with synchrotron radiation. We determined the phase relations of sanidine, the wadeite-type K2Si409 + kyanite (A12SiOs) + coesite (SiO2) assemblage, and hollandite-type KA1Si3Os, including melting temperatures of potassic phases, up to 11 GPa. Our data on subsolidus phase boundaries are close to the recent data of Yagi and Akaogi (1991). Melting relations of sanidine are consistent with the low pressure data of Lindsley (1966). The breakdown of sanidine into three phases reduces melting temperature, and wadeite-type K2Si40 9 melts first around 1500 ~ C in three phase coexisting region. Melting point of hollandite-type KA1Si3Q is between 1700 ~ C and 1800 ~ C at 11 GPa. If these potassic phases host potassium in the earth's mantle, the true mantle solidus temperature will be much lower than the reported dry solidus temperature of peridotite.

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