Tectosilicates: the feldspars Nesse EPSC210 Introductory Mineralogy.
single feldspar two feldspars · two feldspars 400 600 550 800 1000 Or Ab 0 20 40 60 80 100 KAlSi O...
21
liquid two feldspars minimum miscibility gap solvus melting T of albite melting T of orthoclase 400 600 800 1000 Or Ab 20 40 60 80 100 0 KAlSi O 3 8 NaAlSi O 3 8 Temperature °C % Ab 1200 1400 KAlSi O -NaAlSi O System at 0.1 Mpa (1 atm.) 3 8 3 8 single feldspar two feldspars
Transcript of single feldspar two feldspars · two feldspars 400 600 550 800 1000 Or Ab 0 20 40 60 80 100 KAlSi O...
liquid
two feldspars
minimum
miscibility gap
solvus
melting Tof albite
melting Tof orthoclase
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
% Ab
1200
1400
KAlSi O -NaAlSi O System at 0.1 Mpa (1 atm.)3 8 3 8
single feldspar
two feldspars
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
1300
single feldspar
100% liquid
liquid composition Ab Or38 62
two feldspars
KAlSi O -NaAlSi O System at 0.1 Mpa (1 atm.)3 8 3 8
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
1250
single feldspar
100% liquid
two feldspars
KAlSi O -NaAlSi O System at 0.1 Mpa (1 atm.)3 8 3 8
liquid composition Ab Or38 62
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
feldspar composition Ab Or05 95
liquid composition Ab Or39 61
two feldspars
KAlSi O -NaAlSi O System at 0.1 Mpa (1 atm.)3 8 3 8
97% liquid3% (K,Na)-feldspar
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1150
1400
single feldspar
feldspar composition Ab Or12 88
liquid composition Ab Or49 51
two feldspars
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
70% liquid30% (K,Na)-feldspar
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1100
1400
single feldspar
feldspar composition Ab Or24 76
liquid composition Ab Or59 41
two feldspars
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
40% liquid60% (K,Na)-feldspar
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1075
1400
single feldspar
two feldspars
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
feldspar composition Ab Or32 68
liquid composition Ab Or63 37
19% liquid81% (K,Na)-feldspar
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1050
1400
single feldspar
two feldspars
liquid gone
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
100% (K,Na)-feldspar
feldspar composition Ab Or38 62
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
liquid gone
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
100% (K,Na)-feldspar
feldspar composition Ab Or38 62
liquid
two feldspars
400
600
800
950
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
liquid gone
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
100% (K,Na)-feldspar
feldspar composition Ab Or38 62
liquid
two feldspars
400
600
800
900
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
liquid gone
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
100% (K,Na)-feldspar
feldspar composition Ab Or38 62
liquid
two feldspars
400
600
800
850
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
liquid gone
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
100% (K,Na)-feldspar
feldspar composition Ab Or38 62
single feldspar
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
two feldspars
liquid gone
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
100% (K,Na)-feldspar
feldspar composition Ab Or38 62
liquid
two feldspars
400
600
800
750
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
liquid gone
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
100% (K,Na)-feldspar
feldspar composition Ab Or38 62
liquid
two feldspars
400
600
800
700
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
feldspar composition Ab Or38 62
liquid gone
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
100% (K,Na)-feldspar
liquid
two feldspars
400
600
800
650
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
feldspar composition Ab Or38 62
liquid gone
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
100% (K,Na)-feldspar
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
K-feldspar composition Ab Or32 68
Na-feldspar composition Ab Or85 15
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
Perthite89% K-feldspar11% Na-feldspar
liquid
two feldspars
400
600
550
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
K-feldspar composition Ab Or25 75
Na-feldspar composition Ab Or91 09
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
Perthite79% K-feldspar
21% Na-feldspar
liquid
two feldspars
400
600
500
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
K-feldspar composition Ab Or20 80
Na-feldspar composition Ab Or94 06
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
Perthite73% K-feldspar
27% Na-feldspar
liquid
two feldspars
400
450
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
two feldspars
K-feldspar composition Ab Or18 82
Na-feldspar composition Ab Or95 05
Perthite71% K-feldspar
29% Na-feldspar
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
liquid
two feldspars
400
600
800
1000
Or Ab
20 40 60 80 1000KAlSi O3 8 NaAlSi O3 8
Tem
pe
ratu
re°C
1200
1400
single feldspar
K-feldspar composition Ab Or16 84
Na-feldspar composition Ab O96 04
KAlSi O -NaAlSi O System at 0.1 MPa (1 atm.)3 8 3 8
Perthite69% K-feldspar
31% Na-feldspar
