A new thermodynamic model for sapphirine: calculated phase equilibria in K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2-Fe2O3

被引:78
作者
Wheller, C. J. [1 ]
Powell, R. [1 ]
机构
[1] Univ Melbourne, Sch Earth Sci, Melbourne, Vic 3010, Australia
基金
澳大利亚研究理事会;
关键词
phase equilibria; sapphirine; thermocalc; UHT; WILSON LAKE; PETROLOGICAL INTEREST; CRUSTAL METAMORPHISM; BEARING ASSEMBLAGES; MINERAL ASSEMBLAGES; FERRIC IRON; PLUS QUARTZ; STABILITY; LABRADOR; COMPLEX;
D O I
10.1111/jmg.12067
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The activity-composition (a-x) relations of sapphirine are re-evaluated in the light of a recent new internally-consistent data set of phase end-members for use in phase equilibria modelling, particularly of ultra-high-temperature (UHT) rocks. This is achieved with the aid of relatively oxidized sapphirine+quartz-bearing granulites from Wilson Lake, Canada. Calculated P-T projections and compatibility diagrams in the K2O-FeO-MgO-Al2O3-SiO2-H2O-TiO2-Fe2O3 (KFMASHTO) system are used to illustrate sapphirine+quartz-bearing phase equilibria in the context of UHT metamorphism. These new a-x relations for sapphirine should allow pseudosection thermobarometry in NCKFMASHTO for estimating peak P-T conditions of sapphirine-bearing rocks.
引用
收藏
页码:287 / 299
页数:13
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