Table AT4. Microprobe analyses of olivine phenocrysts.
Hole, core, section,
interval (cm)
Texture
 
Major element oxides (wt%)
SiO2
FeO
MnO
MgO
CaO
Cr2O3
NiO
Total
Mg#
163X-
SEG44A-1-1 (Piece 1B, 39–41)

35.92 28.43 0.34 34.67 0.36 0.18 0.22 100.13 0.68



37.98 25.02 0.40 38.35 0.31 0.01 0.14 102.21 0.73



38.05 23.79 0.34 38.17 0.30 0.07 0.08 100.79 0.74



37.14 24.09 0.35 39.37 0.32 0.00 0.09 101.36 0.74



37.15 23.67 0.29 38.78 0.34 0.00 0.02 100.24 0.74



37.49 23.71 0.31 38.98 0.35 0.00 0.07 100.90 0.75



38.26 22.92 0.37 38.48 0.33 0.04 0.08 100.49 0.75



37.98 23.26 0.27 39.33 0.33 0.05 0.08 101.31 0.75



37.56 22.99 0.35 38.90 0.36 0.03 0.13 100.32 0.75



38.08 22.83 0.36 39.49 0.27 0.00 0.18 101.20 0.76


Average 37.74 23.59 0.34 38.87 0.32 0.02 0.10 100.98 0.75


Standard 0.42 0.69 0.04 0.47 0.03 0.03 0.05
0.01
SEG56B-1-1 (Piece 4, 14–18)

36.08 28.42 0.26 34.54 0.27 0.02 0.01 99.62 0.68



36.29 27.63 0.41 35.73 0.34 0.03 0.08 100.52 0.70



35.85 27.21 0.41 35.62 0.32 0.05 0.07 99.53 0.70


Average 36.07 27.76 0.36 35.30 0.31 0.04 0.05 99.89 0.69


Standard 0.22 0.62 0.09 0.66 0.03 0.01 0.04
0.01
SEG57A-1-1 (Piece 5, 18–22)

36.47 34.63 0.64 29.44 0.38 0.00 0.06 101.62 0.60



35.45 34.63 0.59 29.60 0.42 0.07 0.00 100.76 0.60



35.87 33.93 0.50 29.49 0.39 0.01 0.08 100.27 0.61



36.60 32.59 0.50 32.01 0.38 0.00 0.13 102.20 0.64



37.22 29.89 0.42 33.97 0.35 0.00 0.09 101.93 0.67


Average 36.32 33.13 0.53 30.90 0.38 0.02 0.07 101.36 0.62


Standard 0.69 2.00 0.09 2.03 0.03 0.03 0.05
0.03
SEG58A-1-1 (Piece 1C, 9–13)

36.24 36.91 0.53 28.96 0.27 0.03 0.09 103.03 0.58



35.87 35.31 0.43 29.17 0.25 0.00 0.02 101.05 0.60



36.01 33.92 0.48 30.20 0.38 0.01 0.09 101.08 0.61



35.93 30.83 0.42 32.74 0.33 0.00 0.12 100.37 0.65


Average 36.01 34.24 0.47 30.27 0.31 0.01 0.08 101.38 0.61


Standard 0.16 2.58 0.05 1.74 0.06 0.02 0.04
0.03
SEG61B-1-1 (Piece 1B, 19–23) gr
34.71 40.79 0.55 24.83 0.31 0.01 0.07 101.26 0.52



35.23 39.46 0.40 25.69 0.30 0.00 0.05 101.13 0.54



35.82 37.94 0.47 27.20 0.28 0.07 0.00 101.77 0.56


Average 35.25 39.39 0.47 25.91 0.30 0.02 0.04 101.39 0.54


Standard 0.55 1.43 0.07 1.20 0.02 0.04 0.03
0.02
SEG61B-1-1 (Piece 8, 95–99)

36.53 30.31 0.50 31.94 0.30 0.00 0.04 99.61 0.65



36.82 27.80 0.40 34.29 0.32 0.00 0.21 99.84 0.69



37.04 26.45 0.40 35.54 0.30 0.01 0.09 99.83 0.71


Average 36.79 28.18 0.43 33.92 0.31 0.01 0.11 99.76 0.68


Standard 0.26 1.96 0.05 1.82 0.01 0.01 0.09
0.03
SEG64B-1-1 (Piece 1, 0–4) dol
37.08 32.84 0.43 31.36 0.31 0.02 0.11 102.15 0.63



37.37 31.13 0.36 33.49 0.33 0.00 0.12 102.80 0.66



37.28 29.43 0.33 34.18 0.34 0.00 0.10 101.67 0.67



37.33 28.62 0.29 34.81 0.30 0.02 0.04 101.42 0.68



37.75 28.29 0.25 35.22 0.27 0.00 0.10 101.89 0.69



37.43 27.92 0.56 35.30 0.32 0.00 0.16 101.69 0.69



37.54 27.50 0.42 35.23 0.33 0.00 0.10 101.11 0.70



37.87 26.69 0.29 35.18 0.32 0.02 0.16 100.52 0.70



37.95 27.33 0.46 36.06 0.26 0.01 0.20 102.26 0.70


Average 37.57 28.36 0.37 34.93 0.31 0.01 0.12 101.67 0.69


Standard 0.26 1.40 0.10 0.78 0.03 0.01 0.05
0.02
SEG76B-1-1 (Piece 2B, 8–10)

36.11 28.61 0.36 34.79 0.42 0.33 0.13 100.73 0.68

Notes: gr = groundmass, dol = dolerite. * = analysis excluded from calculation of average.