THE EFFECT OF TSCHERMAK SUBSTITUTION ON ASSEMBLAGES IN ALUMINOUS DOLOMITES

被引：8

作者：

BAKER, J ^{[1
]}

HOLLAND, TJB ^{[1
]}

POWELL, R ^{[1
]}

机构：

[1] UNIV MELBOURNE,DEPT GEOL,PARKVILLE,VIC 3052,AUSTRALIA

来源：

CONTRIBUTIONS TO MINERALOGY AND PETROLOGY | 1994年 / 118卷 / 01期

关键词：

D O I：

10.1007/BF00310610

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

A calculated petrogenetic grid for the system CaO-MgO-Al2O3-SiO2-CO2-H2O (CaMASCH), incorporating Tschermak's substitutions in amphibole, chlorite, talc and clinopyroxene, is used to examine phase relationships in aluminous marbles. A series of diagrams illustrating the effect upon stable mineral assemblages of increasing the aluminium content of a bulk composition is used to show the way aluminous minerals enter mineral assemblages in progressively more aluminous rocks. The effects of changing pressure and the incorporation of Fe into the bulk composition on the stable mineral assemblages are also examined. The calculated equilibria are shown to be in reasonable agreement with natural assemblages, and the incorporation of new experimental data on amphiboles into the existing dataset is shown to improve the agreement between observed and natural amphibole compositions.

引用

页码：48 / 59

页数：12

共 31 条

[1]

BAKER J, 1990, THESIS U CAMBRIDGE U

[2]

BOWMAN JR, 1977, MONT GEOL SOC AM ABS, V9, P908

[3] PETROLOGY OF CHLORITE-SPINEL MARBLES FROM NW SPITSBERGEN (SVALBARD) [J].