Table 1. Electron microprobe analyses of Hole 1001A basalt glass and representative feldspars.

Core, section,
interval (cm):
56R-2, 33
56R-2,77-80
53R-4, 105
54R-6, 134
55R-1, 9
56R-2, 33
Formation:
Formation B
Formation G
Formation H
Formation L
Sample:
Glass
Whole rock*
P. core
P. rim
Gmass
P. core
Gmass
P. core
Gmass
Glom.
Lath
SiO2 49.99   49.80   46.88 53.13 53.67   50.49 55.24   46.19 49.77   49.98 50.31
TiO2 1.48   1.45                          
Al2O3 13.90   14.50   33.25 28.75 28.55   30.56 27.13   33.77 30.8   31.12 30.28
FeO 12.51       0.54 0.95 1.19   0.70 1.14   0.46 0.68   0.72 0.91
Fe2O3     11.50                          
MnO 0.24   0.20                          
MgO 7.32   7.01                          
CaO 12.36   13.02   17.08 12.35 12.25   14.82 10.66   17.66 14.68   14.56 14.27
Na2O 2.36   2.26   1.78 4.29 4.51   3.03 5.39   1.54 3.01   2.86 3.12
K2O 0.05   0.19   0.00 0.00 0.02   0.01 0.04   0.02 0.01   0.01 0.01
P2O5 0.09   0.10                          
LOI 1.45                              
Total 100.30   100.05   99.54 99.47 100.19   99.62 99.61   99.64 98.95   99.25 98.91
An%         84.10 61.40 60.00   72.90 52.10   86.30 72.90   73.70 71.60

Notes: Beam conditions were 15 nA beam current and 15 kV accelerating voltage. * = from Sigurdsson, Leckie, Acton, et al. (1997). P = phenocryst, Gmass = groundmass plagioclase lath, Glom = plagioclase and pyroxene glomerocryst, LOI = loss on ignition, blank cells = element not analyzed.