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.