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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