In:
Mineralogical Magazine, Mineralogical Society, Vol. 75, No. 2 ( 2011-04), p. 363-374
Abstract:
The unit-cell parameters of andalusite and sillimanite have been measured by high- T powder X-ray diffraction up to 1000°C at ambient pressure. Within the temperature range investigated, all the unit-cell parameters varied smoothly, indicating no phase transition. The volume-temperature data were fitted with a polynomial expression for the thermal expansion coefficient (α T = a 0 + a 1 T + a 2 T -2 ). yielding a 0 = 2.55(2) × 10 –5 K –1 , a l = 0 and a 2 = 0 for andalusite, and a 0 = 1.40(4) × 10 –5 K –1 a 1 = 7.1(8) × 10 –9 K –2 and a 2 = 0 for sillimanite. Using the new thermal expansion data determined in the present study and compressional data from the literature, the P-T phase relations of the kyanite-andalusite-sillimanite system were calculated thermodynamically, with the invariant point located at ∼523°C and 3.93 kbar.
Type of Medium:
Online Resource
ISSN:
0026-461X
,
1471-8022
DOI:
10.1180/minmag.2011.075.2.363
Language:
English
Publisher:
Mineralogical Society
Publication Date:
2011
detail.hit.zdb_id:
2034522-7
SSG:
13
