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Earth, Planets and Space

Table 3 Chemical composition of melt inclusions in the scoria from the 1979, 1989, and 2014 eruptions analyzed by EPMA and SIMS (wt%). Gas saturation pressure calculated from the H2O and CO2 content of the melt inclusions and temperature and pressure of the magma estimated with thermobarometers proposed by Putirka (2008) are also shown

From: Petrological characteristics and volatile content of magma of the 1979, 1989, and 2014 eruptions of Nakadake, Aso volcano, Japan

 

1979.6.16 scoria

     

Sample ID

AS790616S

AS790616S

AS790616S

AS790616S

AS790616S

AS790616S

MI no.

mts10120601-2-p6i2

mts10120608-2-p5i1

mts10120601-3-p2i1

mts10120601-3-p2i2

mts10120608-2-p3i1

mts10120608-2-p4i1

Host phenocryst

Pl(An66)

Pl(An63)

Cpx(Wo37En44Fs19 Mg#70)

Cpx(Wo38En43Fs18 Mg#70)

Cpx(Wo37En44Fs19 Mg#70)

Cpx(Wo38En43Fs19 Mg#69)

Size of MI

0.12 × 0.05 (mm)

0.10 × 0.04 (mm)

0.08 × 0.05 (mm)

0.10 × 0.10 (mm)

0.06 × 0.04 (mm)

0.07 × 0.06 (mm)

SiO2

54.39

59.57

56.01

55.81

56.22

58.35

TiO2

1.49

1.14

1.41

1.30

1.36

1.35

Al2O3

14.03

14.27

13.68

13.47

14.19

13.41

FeOt

10.20

6.99

10.59

11.53

9.09

9.11

MnO

0.18

0.09

0.19

0.25

0.17

0.19

MgO

2.88

1.85

2.46

2.81

2.36

2.12

CaO

5.68

4.57

5.75

5.98

5.18

4.74

Na2O

2.99

3.18

2.71

2.78

3.28

2.74

K2O

3.26

4.21

3.25

3.08

3.79

4.28

P2O5

0.32

0.12

0.26

0.23

0.32

0.29

S

0.021

0.013

0.015

0.019

0.010

0.018

Cl

0.075

0.065

0.071

0.074

0.074

0.088

H2O (SIMS/EPMA)a

0.3/1.3

1.2/1.0

0.6/0.9

0.6/0.5

0.9/1.0

1.3/0.8

CO2 (SIMS)b

0.012

0.034

0.024

0.020

0.009

0.025

S(+ 6)/total Sc

0.2

0.3

0.8

0.6

n.a.

0.6

log fO d2

− 9

− 9

− 8

− 8

n.a.

− 8

Fe(+ 2)/total Fee

0.7

0.8

0.8

0.7

n.a.

0.7

NNO (log unit)f

− 0.4

0.0

0.8

0.5

n.a.

0.5

Sat. Press. (MPa)g

61

118

102

98

51

113

Temperature (°C)h

1066

1046

1074

1073

1062

1059

Pressure (MPa) (cpx–liquid)h

  

440

410

390

560

K iD

0.17

0.13

0.22

0.23

0.25

0.24

 

1979.6.16 scoria

1989.11.24 scoria

    

Sample ID

AS790616S

AS891124

AS891124

AS891124

AS891124

AS891124

MI no.

mts10120608-2-p1i1

mts10120601-4-p1i1

mts10120601-4-p3i1

mts10120608-4-p1i1

mts10120608-4-p3i1

mts10120608-4-p3i2

Host phenocryst

Ol(Fo65)

Cpx(Wo38En44Fs18 Mg#71)

Cpx(Wo37En43Fs20 Mg#68)

Cpx(Wo37En43Fs20 Mg#69)

Cpx(Wo39En43Fs19 Mg#70)

Cpx(Wo40En43Fs18 Mg#71)

Size of MI

0.20 × 0.10 (mm)

0.20 × 0.10 (mm)

0.10 × 0.06 (mm)

0.15 × 0.10 (mm)

0.10 × 0.10 (mm)

0.09 × 0.09 (mm)

SiO2

57.66

58.40

59.24

58.44

59.71

57.92

TiO2

1.29

1.49

1.27

1.27

1.40

1.37

Al2O3

13.47

14.30

14.42

14.60

14.24

14.67

FeOt

9.78

9.92

8.09

8.97

7.99

9.57

MnO

0.17

0.18

0.14

0.16

0.18

0.24

MgO

2.51

1.99

1.93

1.99

1.91

1.65

CaO

5.22

5.17

5.15

4.95

5.74

4.79

Na2O

2.87

2.96

2.90

2.91

2.49

3.21

K2O

3.52

3.83

3.57

3.89

3.38

4.39

P2O5

0.29

0.36

0.27

0.29

0.28

0.23

S

0.018

0.016

0.015

0.012

0.015

0.019

Cl

0.087

0.090

0.070

0.086

0.081

0.080

H2O (SIMS/EPMA)a

1.6/0.7

0.6/0.2

0.5/0.6

0.5/0.4

0.5/0.5

0.3/0.3

CO2 (SIMS)b

0.007

0.009

0.004

0.007

0.006

0.003

S(+ 6)/total Sc

0.5

0.1

0.7

0.0

0.1

0.1

log fO d2

− 9

− 10

− 8

− 10

− 9

− 10

Fe(+ 2)/total Fee

0.8

0.9

0.7

0.9

0.8

0.9

NNO (log unit)f

0.2

− 0.9

0.7

− 1.2

− 0.5

− 0.9

Sat. Press. (MPa)g

53

50

18

37

22

21

Temperature (°C)h

1034

1058

1071

1055

1068

1031

Pressure (MPa) (cpx–liquid)h

 

460

560

440

470

280

K iD

0.31

0.18

0.25

0.22

0.23

0.16

 

2014.11.26–27 scoria

    

Sample ID

I141129S01

I141129S

I141129S

I141129S02

I141129S03

MI no.

mts16041403-2-p1i1

mts16041403-4-p1i1

mts16041403-4-p1i2

I141129S02-1-p4i1

I141129S03-1-p1i1

Host phenocryst

Pl(An60)

Pl(An65)

Pl(An65)

Pl(An76)

Pl(An63)

Size of MI

0.10 × 0.08 (mm)

0.10 × 0.04 (mm)

0.08 × 0.04 (mm)

0.05 × 0.02 (mm)

0.04 × 0.01 (mm)

SiO2

62.12

57.96

57.65

56.33

56.21

TiO2

0.91

1.32

1.34

1.38

1.32

Al2O3

14.51

14.36

14.34

13.35

13.39

FeOt

7.53

9.47

9.80

9.30

9.09

MnO

0.14

0.14

0.16

0.18

0.21

MgO

1.96

2.99

2.66

2.71

2.75

CaO

4.30

5.92

5.58

5.53

5.03

Na2O

3.10

3.02

3.27

2.60

2.65

K2O

4.66

3.52

3.68

3.54

3.86

P2O5

0.31

0.64

0.62

0.31

0.23

S

0.008

0.015

0.014

0.018

0.029

Cl

0.055

0.087

0.075

0.075

0.071

H2O (SIMS/EPMA)a

0.8/0.1

0.7/0.2

0.7/0.3

na/1.5

na/2.0

CO2 (SIMS)b

0.002

0.008

0.017

na

na

S(+ 6)/total Sc

0.1

0.4

0.1

na

na

log fO d2

− 9

− 9

− 9

na

na

Fe(+ 2)/total Fee

0.8

0.8

0.8

na

na

NNO (log unit)f

− 0.5

0.1

− 0.4

na

na

Sat. Press. (MPa)g

27

41

80

na

na

Temperature (°C)h

1040

1081

1078

1059

1027

Pressure (MPa) (cpx–liquid)h

     

K iD

0.14

0.17

0.15

0.11

0.18

 

2014.11.26–27 scoria

    

Sample ID

I141129S

I141129S02

I141129S01

I141129S

I141129S02

MI no.

mts16041403-4-p2i1

I141129S02-1-p11i2

mts16041403-2-p2i1

mts16041403-3-p1i1

I141129S02-1-p12i1

Host phenocryst

Cpx(Wo38En43Fs19 Mg#69)

Cpx(Wo38En45Fs18 Mg#71)

Ol(Fo67)

Ol(Fo66)

Ol(Fo67)

Size of MI

0.10 × 0.05 (mm)

0.02 × 0.02 (mm)

0.08 × 0.07 (mm)

0.20 × 0.20 (mm)

0.02 × 0.02 (mm)

SiO2

58.21

54.89

57.93

58.11

56.34

TiO2

1.21

1.45

1.38

1.20

1.34

Al2O3

14.55

14.35

14.51

14.37

14.13

FeOt

9.69

9.50

9.99

9.43

9.02

MnO

0.21

0.17

0.15

0.19

0.15

MgO

2.71

2.28

2.64

2.55

2.50

CaO

5.67

5.96

5.89

5.66

5.66

Na2O

3.67

3.14

3.07

2.92

2.97

K2O

3.05

3.25

3.43

3.64

3.45

P2O5

0.44

0.24

0.52

0.51

0.23

S

0.009

0.036

0.013

0.010

0.019

Cl

0.074

0.079

0.068

0.079

0.072

H2O(SIMS/EPMA)a

0.6/0.1

na/1.5

0.7/0.1

0.7/0.6

na/1.0

CO2 (SIMS)b

nd

na

0.003

0.004

na

S(+ 6)/total Sc

na

na

0.4

0.7

na

log fO d2

na

na

− 9

− 8

na

Fe(+ 2)/total Fee

na

na

0.8

0.7

na

NNO (log unit)f

na

na

0.1

0.7

na

Sat. Press. (MPa)g

na

na

22

25

na

Temperature (°C)h

1071

1072

1046

1046

1042

Pressure (MPa) (cpx–liquid)h

420

460

   

K iD

0.28

0.21

0.30

0.31

0.31

  1. KD of the melt inclusions in olivines = (X(ol-Fe)/X(ol-Mg))/(X(liq-FeO)/X(liq-MgO)). X(ol-Fe) and X(ol-Mg) are mol fractions of fayalite and forsterite in olivine, and X(liq-FeO) and X(liq-MgO) are cation fraction of Fe(+ 2) and Mg in the melt. The mol fraction ratio of Fe(+ 2) to total Fe in the melt was assumed to be 0.8. At equilibrium, this KD is 0.299 ± 0.053 for P<2 GPa (Putirka 2008)
  2. KD of the clinopyroxene-hosted inclusions = − (X(cpx-Fe)/X(cpx-Mg))/(X(liq-FeO)/X(liq-MgO)). X(cpx-Fe) and X(cpx-Mg) are mol fractions of forsterite and enstatite in clinopyroxene, and X(liq-FeO) and X(liq-MgO) are cation fraction of Fe(+ 2) and Mg in the melt. The mol fraction ratio of Fe(+ 2) to total Fe in the melt was assumed to be 0.8. At equilibrium, this KD is 0.28 ± 0.08 (Putirka 2008)
  3. FeOt, total FeO; nd, not detected; na, not analyzed
  4. ax/y: x, analyzed by SIMS, y, analyzed by EPMA. The analytical errors is ± 0.2 wt% for SIMS (Saito et al. 2010) and ± 1 wt% for EPMA
  5. bThe analytical error is ± 0.0028 wt% (Saito et al. 2010)
  6. cMol fractions of S(+ 6) in total S in the melt inclusions calculated from the S Kα radiation wavelength measured by EPMA, assuming that all S in the inclusions is composed of S(+ 6) and S(− 2)
  7. dCalculated from the mol fraction of S(+ 6) in total S in the inclusions by Wallace and Carmichael (1994), assuming temperature of 1079 °C
  8. eCalculated from the oxygen fugacity and chemical composition of the inclusions by Kilinc et al. (1983), assuming temperature of 1079 °C
  9. fEstimates with 1079 °C
  10. gSaturation pressures calculated from H2O and CO2 contents of the melt inclusions using the solubility model of Papale et al. (2006). An online version of the Papale’s solubility model (http://melts.ofm-research.org/CORBA_CTserver/Papale/Papale.php) was used for these calculations. The mol ratio of Fe(+ 2) to total Fe in the melt and temperature was assumed to be 0.8 and 1079 °C, respectively
  11. hTemperatures of the melt inclusions in plagioclases were estimated from chemical compositions of the melt and their host phenocrysts using plagioclase–liquid thermometer by Putirka (2008, Eq. (24a)). This thermometer yields a standard error of estimate (SEE) of 36 °C. Temperature of the melt inclusions in olivines was estimated from chemical compositions of the melt and their host phenocrysts using olivine–liquid thermometer by Putirka (2008, Eq. (22)). This thermometer yields SEE of 29 °C. Temperature and pressure of the melt inclusions in clinopyroxenes were estimated from chemical compositions of the melt and their host phenocrysts using clinopyroxene–liquid thermobarometers by Putirka (2008; Eqs. (31) and (33)). These thermobarometers yield SEE of 42 °C and 290 MPa. Saturation pressures and H2O contents of the melt inclusions analyzed by SIMS were used for this calculationin. If the saturation pressures were not determined, pressure of 100 MPa was assumed. If the inclusions were not analyzed by SIMS, the H2O contents analyzed by EPMA were used
  12. iKD of the melt inclusions in plagioclases = X(pl-Ab)X(liq-AlO1.5)X(liq-CaO)/(X(pl-An)X(liq-NaO0.5)X(liq-SiO2)). X(pl-Ab) and X(pl-An) are mol fraction of albite and anorthite in plagioclase, and X(liq-AlO1.5), X(liq-CaO), X(liq-NaO0.5) and X(liq-SiO2) are cation fractions of Al, Ca, Na and Si in the melt (Putirka 2008). At equilibrium, this KD is 0.10 ± 0.05 for T < 1050 °C, and 0.27 ± 0.11 for T ≥ 1050 °C (Putirka 2008)
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