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Table 4 Micro-FTIR analyses of pyrope from Garnet Ridge

From: Hydrous Na-garnet from Garnet Ridge; products of mantle metasomatism underneath the Colorado Plateau

Chemistry

Micro-FTIR analysis

Classification

Sample no.

Pyp(mol%)

Cao(wt%)

Cr2O3 (wt%)

Band positions (cm−1)

Int. Abs. a(cm−1)

OH contents (ppmw)

A

Cr-rich pyrope

S1_Pr1

69

5.5

2.2

   

3573

41.3

24

A

Cr-rich pyrope

S1_Pr2

70

5.5

2.3

  

3678

3573

83.7

48

A

Cr-rich pyrope

S1_Pr3

70

4.9

2.8

  

3678

3572

164.9

95

A

Cr-rich pyrope

S2_Pr1

69

5.3

5.1

  

3673

3571

136.8

78

A

Cr-rich pyrope

S2_Pr2

69

5.2

2.3

  

3680

3571

60.3

35

A

Cr-rich pyrope

S2_R3

67

5.1

2.3

  

3675

3571

201.0

115

B1

Amp type

S1_Br1

59

7.6

0.0

   

3575

41.5

24

B1

Amp type

S2_Br2

49

7.6

0.0

  

3674

3578

73.3

42

B1

Amp type

S4_Br1

65

7.3

0.1

   

3574

10.7

6

B1

Amp type

S6_Br1

62

7.0

0.1

   

3569

4.8

3

B2

Ilm-only type

S2_Br2

57

5.6

1.8

  

3666

3573

176.7

101

B2

Ilm-only type

S5_Br2

60

6.3

1.8

  

3653

3549

46.9

27

B3

Dense lamellae type

0909B_Bl3_1

73

4.6

0.3

   

3580

6.7

4

B3

Dense lamellae type

0909B_Bl3_2

69

5.3

0.4

3718(Amp)

  

3570

17.2

10

B3

Dense lamellae type

0909B_Bl3_3

69

5.1

0.3

   

3572

7.5

4

B3

Dense lamellae type

0909B_Bl3_4

60

5.1

1.0

3712(Amp)

3684(Amp)

 

3579

12.4

7

B4

Cpx-Amp type

S3_Br1

66

4.8

0.5

   

3569

4.0

2

  1. aIntegrated absorbance of OH bands of garnet host