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

来源：

JOURNAL OF METAMORPHIC GEOLOGY | 2014年 / 32卷 / 03期

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

页码：287 / 299

页数：13

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