Table T1. Representative microprobe analyses of plagioclase.
Hole:
195-1201D-
 
Core, section,
piece, interval (cm):
45R-5 (Piece 1, 103–107)
46R-4 (Piece 6A, 24–27)
48R-2
(Piece 18, 38–41)
48R-2
(Piece 5, 135–138)
49R-1
(Piece 14C, 145–147)
55R-1 (Piece 5R, 103–106)
Analysis label:
110-3-2
110-3-13
110-10-10
117-22-3
117-29-4
134-101-7
131-51-4
135-112-2
144-122-5
144-122-6
144-122-14
144-122-15
Description:
Micropheno-cryst, rim
Micropheno-cryst, rim
Phenocryst,
rim
Altered phenocryst,
rim
Altered phenocryst,
rim
Microphenocryst,
core
Altered phenocryst,
rim
Microlite, core
Microlite,
core
Microlite,
rim
Phenocryst,
core
Phenocryst,
rim
Major element oxides (wt%):
SiO2 54.42 51.27 50.82 54.02 53.13 54.40 53.80 57.72 49.59 50.29 49.57 51.66
TiO2 0.09 BDL 0.05 0.08 0.07 BDL 0.07 0.11 BDL 0.05 0.07 0.11
Al2O3 28.91 30.00 30.30 28.23 28.22 27.39 27.47 26.51 31.24 30.62 31.10 29.63
Fe2O3* 1.08 0.77 0.76 1.21 1.01 1.10 0.96 0.56 0.94 0.73 0.70 0.85
MgO 0.24 0.38 0.38 0.21 0.14 0.27 0.59 0.03 0.33 0.33 0.28 0.26
CaO 12.25 14.74 15.16 12.41 11.72 12.71 12.89 9.07 16.29 15.23 15.89 14.24
Na2O 3.93 3.44 2.95 5.58 4.33 4.54 3.25 6.60 2.66 2.79 2.72 3.49
K2O 0.03 0.10 0.06 0.09 0.17 0.05 1.37 0.02 BDL BDL BDL BDL
Totals: 100.95 100.70 100.48 101.82 98.79 100.47 100.39 100.61 101.05 100.06 100.33 100.24
Mineralogy (a.f.p.u.):
Si 9.750 9.311 9.248 9.684 9.745 9.839 9.779 10.304 9.016 9.188 9.059 9.401
Ti 0.012 0.000 0.007 0.011 0.009 0.000 0.010 0.014 0.000 0.007 0.009 0.015
Al 6.105 6.422 6.499 5.964 6.101 5.837 5.885 5.577 6.695 6.594 6.699 6.354
Fe3+ 0.146 0.105 0.104 0.163 0.140 0.150 0.131 0.075 0.128 0.101 0.096 0.117
Mg 0.063 0.102 0.102 0.056 0.039 0.071 0.160 0.007 0.091 0.091 0.076 0.070
Ca 2.351 2.868 2.956 2.384 2.302 2.464 2.510 1.734 3.173 2.982 3.112 2.776
Na 1.367 1.213 1.042 1.938 1.541 1.592 1.144 2.284 0.937 0.987 0.966 1.231
K 0.008 0.022 0.013 0.020 0.039 0.012 0.317 0.006 0.000 0.000 0.000 0.000
Totals: 19.801 20.043 19.971 20.220 19.916 19.967 19.935 20.001 20.041 19.950 20.017 19.964
Composition (mol%):
An 63.11 69.90 73.70 54.90 59.31 60.58 63.19 43.09 77.19 75.07 76.30 69.29
Ab 36.68 29.56 25.98 44.64 39.70 39.14 28.81 56.77 22.81 24.86 23.67 30.71
Or 0.21 0.55 0.32 0.46 1.00 0.28 7.99 0.14 0.00 0.07 0.03 0.00

Notes: Formulas calculated on the basis of 32 oxygens. * = all Fe as Fe2O3. BDL = below detection limit, a.p.f.u. = atoms per formula unit, mol% = molar percentage.