Alt, J.C., Kinoshita, H., Stokking, L.B., and Michael, P.J. (Eds.), 1996
Proceedings of the Ocean Drilling Program, Scientific Results, Vol. 148
39. DATA REPORT: MAJOR-ELEMENT CHEMISTRY OF HOLE 896A GLASS1
Martin R. Fisk,2 Andrew W. McNeill,3 Damon A.H. Teagle,4 Harald Furnes,5 and Wolfgang Bach6
INTRODUCTION
Ocean Drilling Program Hole 896A (ri3.01'N, 83°43.39'W) is
in 3440 m of water east of the Galapagos Platform in the equatorial
eastern Pacific Ocean. At this site in 5.9 Ma crust, basement rocks
were recovered over the depth range of 195.1 meters below seafloor
(mbsf) to 469 mbsf. These rocks are mostly pillow lavas, but massive
flows, breccias and dikes are also present. Many of the lavas and
flows have quenched glass on their exteriors, and breccias commonly
contain glass. Glass was analyzed by electron microprobe in six laboratories as part of shore-based studies of the rocks. These analyses
are collected here so that all the chemical analyses are available in
one publication. The analyses are interpreted in individual publications elsewhere in this volume.
METHODS
Analyses by Fisk were done on a 4-spectrometer CAMECA SX50 at Oregon State University (except for Sample 148-896A-12R-1,
52-55 cm, which was analyzed with the nine-spectrometer ARL microprobe at the Smithsonian Institution). The CAMECA SX-50 analyses were conducted with an accelerating voltage of 15 kV, a beam
current of 30 nA, and a beam diameter of 10 µm. The standards were
basalt glass A-99 (Jarosewich et al., 1980) for Si, Ti, Al, Fe, and Ca.
Mineral standards for the elements Mg, Na, K, Mn, P, and Cr were
Kakanui augite, Kakanui anorthoclase, Hohenfels sanidine, pyroxmangite, Durango fluorapatite, and Tiabaghi chromite, respectively.
Counting times for all elements were 10 s, except for aluminum and
titanium, which were counted for 20 s. Backgrounds were counted
above and below the peaks for half of the peak counting time and
background offsets were ±500 to ±700 units except for Mg, which
was ±1300 units to avoid interference from a higher order Ca peak.
Na was always analyzed first. The PAP correction procedure supplied by Cameca was used to calculate the weight percentage of oxides from X-ray counts. Analyses of Sample 148-896A-12R-1, 5255 cm, with the ARL microprobe used a beam current of 150 nA and
an accelerating voltage of 15 kV. Standard glass A-99 was used to
monitor the standardization during the analysis of Site 896 glass, and
the averages and standard deviations of these analyses are given in
Table 1.
'Alt, J.C., Kinoshita, H., Stokking, L.B., and Michael, P.J. (Eds.), 1996. Proc.
ODP, Sci. Results, 148: College Station, TX (Ocean Drilling Program).
2
College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis,
OR 97331, U.S.A. mfisk@oce.orst.edu
3
Geology Department, University of Tasmania, Hobart, Tasmania, 7001, Australia.
andrew.mcneill@geol.utas.edu.au
"•Department of Geological Sciences, The University of Michigan, 1006 C.C. Little
Building, Ann Arbor, MI 48109-1063, U.S.A. teagle@umich.edu
'Geological Institute, University of Bergen, Allegaten 41, N-5007 Bergen, Norway.
Harald.Furnes@geol.uib.no
<•GeoForschungsZentrum Potsdam, Projektbereich 4.2, Telegrafenberg A50, D-14473
Potsdam, Federal Republic of Germany (present address: Universitat Potsdam, Institut für
Geowissenschaften, Postfach 601553, D-14415 Potsdam, Federal Republic of Germany).
wbach@gfz-potsdam.de
Analyses by Teagle were made with a 4-spectrometer CAMECA
Camebax microprobe at the University of Michigan. The accelerating
voltage was 15 kV and the beam current was 10 nA. The beam was
rastered over a 3 × 3 µm area, and the counting time for all elements
was 30 s. Background offsets were ±600 units, except for magnesium, which was ±750 units. Smithsonian glass standard VG-2
(Jarosewich et al., 1980) was used to calibrate silicon and aluminum.
The other elements were standardized on minerals as follows: K and
Na on feldspars, Ca on wollastonite, Mg on a magnesium-rich garnet,
Fe on synthetic ferrosilicate, Ti on geikilite, Mn on a manganese oxide, Cr on a chrome-rich garnet, and P on a phosphate. The PAP correction procedure supplied by Cameca was used to calculate oxide
weight percentages from X-ray intensities. Average analyses and
standard deviations of standard glasses VG-2 and VGBS are given in
Table 1.
Analyses by McNeill were done on a CAMECA SX-50 microprobe at the University of Tasmania. The accelerating voltage was 15
kV and the beam current was 20 nA. For analysis the beam was
scanned over a 6 × 4 µm area. Counting times on peaks were 20 s for
Fe and K, and 10 s for the other elements. Backgrounds were counted
for half of the peak-count time. Standards were: VG-2 for Si, Al, Mg,
and Ca; Kakanui anorthoclase for Na; Durango apatite for P; microcline (USNM 143966) for K; Ilmen Mt. ilmenite for Ti; and Tiebaghi
chromite (USNM 117075) for chrome. The PAP correction procedure supplied by Cameca was used to convert intensities into oxide
weight percent. Analyses of the standard VG-2 are given in Table 1.
Analyses by Furnes were done on a CAMECA Camebax microprobe using a 15 kV accelerating voltage, a 5 nA beam current, and a
1 µm beam diameter. Peaks were counted for 10 s and the backgrounds for 5 s. The standards used were wollastonite for Si and Ca,
MnTi alloy for Mn and Ti, A12O3 for Al, FeO for Fe, MgO for Mg,
omphacite for Na, and orthoclase for K. The correction procedure
was MAGIC IV (Colby, 1968).
Analyses by Bach were done on a CAMECA SX-50 microprobe
using 15 kV accelerating voltage, a 20 nA beam current, and a beam
diameter of 20 µm. Peak intensities were counted for 20 s, except for
K and P, for which 40 s count-times were used. Backgrounds were
counted for half of the peak count-times and the correction procedure
was the PAP program supplied by CAMECA. The pure mineral standards were used as,follows: wollastonite for Si and Ca, MnTiO3 for
Ti and Mn, A12O3 for Al, Fe2O3 for Fe, MgO for Mg, albite for Na,
orthoclase for K, CePO4 for P, and ZnS for S.
RESULTS
Average oxide abundances for glass from basalts from the five
laboratories are presented in Figure 1 and Table 2. The data are arranged in order of increasing depth and "N" indicates the number of
analyses in each average. Absence of P2O5 and Cr2O3 for some analyses indicates that these elements were not analyzed.
Interlaboratory comparisons of identical samples indicate that
there are consistent differences for some of the elements (Fig. 2). For
example, SiO2 values are consistently higher in the University of
483
DATA REPORT
Table 1. Analysis of standards.
Standard (analyst)
VG-2 published (Jarosewich et al., 1980)
VG-2 average (Teagle)
VG-2 average (McNeill)
VGBS published (Jarosewich et al., 1980)
VGBS average (Teagle)
A-99 published (Jarosewich et al., 1980)
A-99 average (Fisk session 1)
A-99 average (Fisk session 2)
A-99 average (Fisk session 3)
N
SiO 2
TiO 2
A12O3
FeO*
MgO
CaO
Na 2 O
K2O
MnO
P2O5
25
Is
9
Is
50.81
51.18
0.59
50.36
0.18
1.85
1.83
0.04
1.85
0.01
14.06
14.02
0.08
14.23
0.08
11.84
11.66
0.17
11.98
0.30
6.71
6.67
0.08
6.78
0.07
11.12
10.83
0.08
10.89
0.06
2.62
2.62
0.06
2.50
0.01
0.19
0.20
0.01
0.20
.001
0.22
0.22
0.03
0.18
0.01
0.20
0.18
0.02
0.22
0.06
19
Is
51.52
52.14
0.41
1.30
1.30
0.04
15.39
15.37
0.11
9.13
9.20
0.15
8.21
7.86
0.07
11.31
11.10
0.10
2.48
2.65
0.05
0.09
0.08
0.01
0.17
0.16
0.03
0.12
0.10
0.02
0.03
0.02
14
Is
15
Is
16
Is
50.94
50.70
0.16
50.98
0.17
50.83
0.26
4.06
4.05
0.05
4.04
0.08
4.01
0.11
12.49
12.58
0.06
12.39
0.08
12.43
0.09
13.30
13.32
0.15
13.15
0.14
13.28
0.19
5.08
5.02
0.08
5.06
0.05
5.11
0.06
9.30
9.30
0.13
9.12
0.31
9.27
0.13
2.66
2.63
0.08
2.65
0.06
2.66
0.06
0.82
0.84
0.02
0.84
0.02
0.84
0.02
0.15
0.19
0.03
0.18
0.04
0.19
0.03
0.38
0.45
0.05
0.45
0.04
0.45
0.04
0.01
0.01
0.02
0.02
0.02
0.02
Cr 2 O 3
0.02
0.02
Total
99.62
99.42
99.19
99.72
99.99
99.19
99.09
98.90
99.10
Notes: N = number of analyses in average. FeO* = all iron as FeO.
150
• •
o
.o 00
•o
DJP
48
49
50
51
52
—•—i
14
15
0.6
'
1
16
'
17
8
AI2O3 (wt%)
Si02 (wt%)
150
10
12
MgO (wt%)
14
0.00 0.01 0.02 0.03 0.04
1.5
Na2O (wt%)
K2O (wt%)
Figure 1. Glass chemistry analyses from Hole 896A by five laboratories plotted vs. depth. Solid circles = Fisk, open circles = McNeill, diamonds = Teagle,
squares = Furnes, and triangles = Bach.
Michigan analyses (Teagle) than in those of Oregon State University
(Fisk), and MgO and CaO values of Teagle are consistently lower
than those of Fisk. The MgO measured using the microprobe at Oregon State University is consistently 0.25 wt% higher than the MgO
from the other laboratories.
This difference is not related to differences in instruments, to correction procedure, or to accelerating voltage because all laboratories
used Cameca instruments, 15 kV accelerating voltages, and PAP correction procedures. Differences between laboratories, however, may
be related to the standards used, the beam conditions (beam current,
and beam diameter), and counting strategies (background offsets,
counting times, and rastered vs. stationary beam). Because of the
484
number of variables, it is not possible to determine which of these resulted in the differences in Si, Mg, and Ca in the three laboratories
with the most data. One factor that may contribute to the differences
of MgO by the different laboratories is the position of the background
offset for Mg. Oregon State University analyses used a larger background offset for Mg than the other laboratories which may have resulted in lower Mg background intensities, and thus larger peakminus-background values.
The average of 25 MgO analyses of VG-2 by Teagle (Table 1) is
within 1 σ of the reported value (Jarosewich et al., 1980), but the 19
analyses for VGBS by Teagle have an average MgO that is 0.35 wt%
(this is 5 σ) below the reported value (Jarosewich et al., 1980). It is
DATA REPORT
Table 2. Microprobe analyses of Hole 896A glass.
Core, section,
interval (cm)
148-896A1R-1, 36-^0
2R-1,63-66
3R-1, 15-25
3R-1, 16-18
3R-1,26-31
3R-1, 34-41
3R-1 , 55-57
4R-1 , 10-13
4R-1 , 75-80
5R-1 , 18-21
5R-1 , 58-64
5R-1, 79-82
5R-2, 32-34
5R-2, 33-35
5R-2, 33-35
5R-2, 35-36
5R-2, 85-89
5R-2, 89-93
5R-2, 89-93
5R-2, 93-97
5R-2, 97-100
5R-2, 97-100
6R-1 ,60-64
6R-1 ,70-72
6R-1 ,70-72
6R-1 ,79-81
6R-1 , 81-82
6R-1 , 138-140
6R-1 , 139-141
6R-2, 18-21
6R-2, 18-21
6R-2, 21-28
6R-2, 28-38
6R-2, 3 9 ^ 5
6R-2, 3 9 ^ 5
6R-3, 0-5
6R-3, 0-3
6R-3, 30-34
7R-1,52-55
7R-1,52-55
7R-1, 132-141
8R-1, 141-149
8R-1, 141-145
9R-l,0-4
9R-1,8-11
9R-1, 17-21
9R-1, 17-21
9R-1,78-81
9R-1, 87-92
9R-1, 125-130
9R-1, 125-130
1 OR-1,22-23
1 OR-1,24-27
10R-1, 28-32
10R-1, 50-57
10R- 1,50-57
11R- 1,0-3
11R- 1,0-3
11R- 1,8-10
11R- 1,73-75
11R- 1, 106-108
11R- 1,109-110
11R- 1,111-113
11R- 1, 132-136
11R-1, 140-143
11R-2, 20-22
11R-2, 24-30
11R-2, 28-37
11R-2, 30-40
11R-2, 40-43
11R-2,40-43
11R-2, 60-63
11R-2, 63-72
11R-2, 63-70
11R-2, 77-86
11R-2, 99-100
12R-l,0-8
12R-l,4-7
12R-1, 18-22
12R-1, 18-22
14R-1,72-76
14R- ,76-80
14R-1,76-80
14R-2, 0-3
14R-3, 0-5
14R-3, 9-13
15R-1,73-85
15R-1, 118-122
Piece
no.
8
14
4
4
5
7
7
2
9C
5
10
14
1C
ID
ID
IE
4
5
5
6
7
7
7
8
8B
9A
10
ID
ID
2
2
3
4
5
5
1
1
4
10
10
22
29
29
1
3
6
6
13
15
24
24
3
4
4
7
7
1
1
3
8A
9
10
10
12
14
1C
2
IB
3
4
4
7
8
10
14
1
1
3
3
6
7
7
1
1
3
13
17
Depth
(mbsf)
Analyst
N
SiO2
TiO2
A12O3
FeO*
MgO
CaO
Na2O
K2O
MnO
P2O5
Cr 2 O 3
195.46
201.53
210.05
210.06
210.16
210.24
210.45
219.00
219.65
228.58
228.98
229.19
229.64
229.65
229.65
229.67
230.17
230.21
230.21
230.25
230.29
230.29
238.50
238.60
238.60
238.69
238.71
239.28
239.29
239.56
239.56
239.59
239.66
239.77
239.77
240.78
240.78
241.08
247.92
247.92
248.72
258.51
258.51
266.70
266.78
266.87
266.87
267.48
267.57
267.95
267.95
276.62
276.64
276.68
276.90
276.90
286.00
286.00
286.08
286.73
287.06
287.09
287.11
287.32
287.40
287.64
287.68
287.72
287.74
287.84
287.84
288.04
288.07
288.07
288.21
288.43
295.60
295.64
295.78
295.78
315.32
315.36
315.36
316.01
317.48
317.57
325.03
325.48
Fisk
McNeill
Fisk
McNeill
Fisk
Fisk
McNeill
McNeill
McNeill
Fisk
Fisk
Fisk
Fisk
McNeill
Fisk
Teagle
Fisk
Fisk
McNeill
Fisk
Fisk
Teagle
Fisk
Fisk
Bach
McNeill
Fisk
Teagle
Fisk
McNeill
Fisk
Fisk
Fisk
McNeill
Fisk
McNeill
Fisk
Fisk
McNeill
Fisk
Fisk
McNeill
Fisk
Fisk
Fisk
Fisk
Furnes
McNeill
Fisk
McNeill
Fisk
Fisk
Teagle
Fisk
McNeill
Fisk
McNeill
Fisk
Fisk
Furnes
Fisk
Fisk
Furnes
Fisk
Fisk
Fisk
Fisk
Teagle
McNeill
Teagle
Fisk
Fisk
McNeill
Fisk
Fisk
Fisk
Fisk
Fisk
McNeill
Fisk
Fisk
McNeill
Fisk
McNeill
McNeill
Fisk
Fisk
McNeill
3
4
2
4
3
49.85
48.99
49.77
48.94
49.70
49.67
48.65
49.11
49.83
49.96
49.56
49.34
49.96
49.46
49.57
50.17
49.55
49.90
49.29
49.22
48.98
50.35
49.79
49.91
49.60
49.41
49.73
50.45
49.85
49.44
49.70
49.79
49.70
49.08
49.96
49.36
50.03
50.20
50.00
49.94
50.33
49.34
50.71
50.51
49.74
50.08
50.70
49.54
50.24
49.68
50.00
50.11
50.73
49.86
49.48
50.08
49.38
49.95
50.10
51.28
49.98
50.01
51.16
50.03
50.00
49.99
50.17
50.22
49.21
50.62
49.05
49.96
49.42
49.42
49.35
48.94
49.66
49.91
49.16
49.90
49.81
49.18
49.93
50.07
49.00
49.39
50.08
49.35
0.70
0.69
0.69
0.70
0.72
0.72
0.70
0.72
0.73
0.67
0.70
0.77
0.76
0.75
0.77
0.72
0.77
0.74
0.74
0.77
0.74
0.74
0.73
0.79
0.77
0.76
0.77
0.74
0.78
0.78
0.74
0.73
0.78
0.77
0.78
0.74
0.73
0.76
0.75
0.79
0.78
0.80
0.77
0.77
0.75
0.79
0.80
0.78
0.82
0.81
0.82
0.84
0.78
0.84
0.80
0.81
0.78
0.80
0.81
0.83
0.83
0.81
0.81
0.81
0.79
0.81
0.85
0.80
0.78
0.78
0.78
0.78
0.80
0.79
0.78
0.77
0.80
0.81
0.79
0.79
0.83
0.86
0.87
0.96
0.80
0.83
0.86
0.85
16.42
16.46
16.20
16.45
16.23
16.22
16.35
16.27
16.27
16.45
16.55
15.82
15.99
16.00
15.97
16.09
16.06
15.93
16.09
15.88
15.76
16.16
15.91
15.91
15.30
16.02
15.92
16.05
16.06
16.03
15.89
15.99
15.93
15.96
15.74
16.05
15.78
15.76
15.90
15.86
16.09
15.95
16.00
15.80
15.70
15.82
15.44
15.79
15.82
15.79
15.76
15.85
15.92
15.80
15.97
15.73
15.96
15.75
15.78
15.56
15.65
15.70
15.31
15.78
15.74
15.70
15.51
15.89
15.88
15.90
15.55
15.82
15.99
15.56
15.61
15.37
15.69
15.91
15.97
15.71
15.64
15.79
15.64
14.85
15.98
15.78
15.32
15.51
8.52
8.78
8.72
8.73
8.69
8.65
8.78
8.80
8.59
8.62
8.58
9.18
8.76
8.95
8.87
8.82
8.87
8.81
8.87
8.73
8.64
8.83
8.83
8.98
8.79
9.07
8.98
8.90
8.99
9.02
8.89
8.91
8.78
9.07
8.93
8.96
8.90
8.90
8.99
8.78
9.18
9.11
9.19
9.21
8.93
9.06
8.92
9.11
9.03
9.03
8.98
9.17
8.95
9.04
9.28
9.16
9.36
9.08
9.03
9.05
9.11
9.00
8.84
9.12
9.04
9.06
9.16
9.12
9.19
8.91
8.46
8.81
9.34
8.63
8.63
8.61
8.92
9.19
9.21
9.18
9.06
9.47
9.32
9.96
9.36
9.33
9.68
9.56
9.66
9.37
9.68
9.36
9.84
9.72
9.39
9.35
9.17
9.83
9.59
9.63
9.49
9.20
9.69
9.14
9.54
9.57
9.16
9.43
9.43
9.19
9.56
9.57
9.38
9.19
9.48
9.11
9.51
9.13
9.52
9.40
9.44
9.13
9.38
9.09
9.44
9.34
8.92
9.43
9.39
9.06
9.35
9.33
9.38
9.48
9.03
8.95
9.47
8.96
9.23
9.25
8.90
9.27
9.05
9.22
8.97
9.20
9.25
8.97
9.30
9.32
9.01
9.24
9.26
9.40
9.44
8.95
9.00
9.02
9.25
9.37
9.05
9.36
9.18
9.12
9.33
9.14
9.04
9.34
9.08
8.82
9.20
8.21
8.99
9.30
8.99
8.77
13.25
13.06
13.24
13.02
13.34
13.11
13.26
13.00
13.03
13.31
13.16
13.05
12.90
12.99
13.26
12.79
13.33
13.36
12.97
13.23
13.25
12.84
13.31
13.28
13.04
12.94
13.28
12.75
13.23
12.87
13.28
13.30
13.30
13.00
13.18
13.03
13.13
13.36
13.27
13.00
13.54
12.95
13.46
13.43
13.38
13.69
13.17
12.99
12.96
12.83
13.20
13.13
12.86
13.12
12.94
13.20
12.97
13.23
13.21
13.36
13.20
13.08
13.20
13.27
13.07
13.26
13.29
12.75
13.08
12.70
12.69
13.11
12.93
12.63
12.74
12.86
13.20
13.35
12.96
13.26
12.91
13.10
13.00
12.92
13.13
13.20
13.21
13.09
1.64
1.74
1.60
1.70
1.67
1.71
1.69
1.74
1.73
1.70
1.66
1.88
1.72
1.76
1.76
1.77
1.70
1.78
1.72
1.69
1.73
1.77
1.76
1.77
1.77
.73
0.01
0.02
0.01
0.02
0.01
0.01
0.02
0.03
0.02
0.00
0.01
0.03
0.00
0.02
0.01
0.02
0.01
0.01
0.01
0.01
0.02
0.00
0.01
0.01
0.01
0.02
0.02
0.01
0.01
0.02
0.00
0.01
0.01
0.02
0.02
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.03
0.02
0.02
0.01
0.01
0.03
0.01
0.03
0.02
0.02
0.01
0.02
0.03
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.01
0.02
0.01
0.01
0.02
0.01
0.01
0.03
0.01
0.02
0.02
0.02
0.02
0.02
0.02
0.03
0.01
0.01
0.03
0.02
0.02
0.01
0.01
0.14
0.16
0.13
0.12
0.11
0.14
0.12
0.15
0.15
0.13
0.13
0.13
0.14
0.14
0.14
0.17
0.14
0.14
0.13
0.14
0.13
0.22
0.15
0.13
0.17
0.16
0.15
0.16
0.12
0.15
0.13
0.15
0.13
0.12
0.17
0.14
0.15
0.13
0.15
0.12
0.12
0.15
0.15
0.16
0.14
0.15
0.17
0.17
0.12
0.14
0.13
0.12
0.17
0.13
0.15
0.11
0.13
0.13
0.11
0.17
0.13
0.13
0.19
0.11
0.12
0.14
0.15
0.21
0.15
0.16
0.14
0.14
0.10
0.15
0.15
0.15
0.15
0.19
0.15
0.15
0.18
0.14
0.15
0.21
0.14
0.17
0.17
0.14
0.03
0.04
0.02
0.04
0.02
0.04
0.05
0.04
0.05
0.04
0.03
0.08
0.03
0.04
0.06
0.06
0.06
0.05
0.05
0.07
0.04
0.07
0.04
0.06
0.06
0.04
0.05
0.05
0.06
0.05
0.03
0.07
0.03
0.03
0.04
0.04
0.04
0.06
0.03
0.03
0.03
0.04
0.05
0.02
0.04
0.05
0.07
0.07
0.05
0.07
0.07
0.04
0.08
0.05
0.04
0.04
0.08
0.07
0.07
0.08
0.06
0.07
0.05
0.10
0.05
0.06
0.06
0.06
0.05
0.05
0.04
0.04
0.05
0.05
0.06
0.10
0.04
0.04
0.05
0.06
0.05
0.05
0.06
0.10
0.07
0.05
0.09
0.06
0.08
0.07
0.03
0.06
0.04
0.05
0.03
0.04
0.07
0.04
0.06
0.07
0.05
0.04
0.06
0.03
0.06
0.05
0.06
0.04
0.04
0.04
0.04
0.07
0.10
0.03
0.05
0.02
0.06
0.03
0.04
0.05
0.04
0.07
0.04
0.07
0.04
0.06
0.06
0.08
0.07
0.05
0.04
0.06
0.07
0.05
0.10
0.07
0.09
3
4
4
4
3
3
1
3
4
3
22
6
4
4
3
4
4
3
3
12
4
3
27
3
4
3
3
2
4
6
4
3
3
4
2
3
4
6
3
3
3
9
4
3
4
3
3
12
3
4
3
4
3
3
9
4
4
7
3
4
5
5
9
4
55
3
3
4
3
3
3
3
15
4
3
3
4
3
4
4
3
3
4
.71
.79
.77
.77
.78
.76
: .81
: .76
.74
.76
.72
.67
.75
.84
: .66
: .73
.74
.70
: .71
.73
.83
1.81
1.61
1.72
1.74
1.72
1.77
1.73
.76
1.71
1.74
1.73
1.67
1.87
1.72
1.75
1.82
.64
1.73
1.79
1.73
1.82
1.77
1.78
1.76
1.75
1.75
1.78
1.81
1.76
1.85
1.88
1.73
1.83
1.85
1.81
1.80
1.82
.81
1.88
1.81
.82
0.06
0.06
0.06
0.08
0.05
0.03
0.07
0.03
0.09
0.06
0.07
0.06
0.06
0.07
0.00
0.06
0.06
0.05
0.07
0.05
0.03
0.06
0.07
0.07
0.06
0.08
0.06
0.06
0.08
0.05
0.07
Total
100.29
99.38
100.11
99.15
100.41
100.04
99.09
99.26
99.61
100.75
100.04
99.98
99.81
99.39
100.17
99.80
100.09
100.38
99.08
99.22
98.79
100.23
100.14
100.45
99.00
99.40
100.15
100.07
100.45
99.31
99.98
100.17
99.94
99.03
100.00
99.25
99.99
100.25
99.84
99.78
101.20
99.20
101.48
101.01
99.82
100.91
100.08
99.26
100.23
99.09
99.97
100.35
100.26
99.92
99.56
100.13
99.43
99.99
100.09
101.12
100.03
99.90
100.35
100.14
99.89
100.27
100.42
99.91
99.17
99.99
97.78
99.87
99.52
98.41
98.41
97.70
99.77
100.51
99.12
100.32
99.47
99.30
100.03
99.13
99.34
100.01
100.26
99.21
485
DATA REPORT
Table 2 (continued).
Core, section,
interval (cm)
Piece
no.
Depth
(mbsf)
Analyst
N
15R-2, 1-5
17R-1,55-59
17R-1,55-59
17R-1, 91-92
17R-2, 95-100
17R-3, 13-15
17R-3, 14-16
17R-3, 15-20
17R-3, 83-85
17R-3, 107-115
17R-3, 108-110
17R-3, 115-118
17R4, 65-70
17R4, 68-70
17R4, 70-76
18R-1,63-70
18R-1,87-90
18R-1,92-94
18R-1,93-96
18R-2, 35-38
18R-2, 60-68
19R-1,4-7
19R-1, 8-11
19R-1,68-74
19R-1, 115-116
19R-1, 115-116
20R-1,37^0
20R-1,43-48
20R-1,48-52
20R-1,48-52
20R-1, 63—64
22R-2, 124-125
22R-2, 124-127
22R-2, 125-127
25R-1,0-5
25R-1,89-93
25R-1,89-93
25R-1,89-93
25R-1, 103-108
25R-1, 120-123
25R-2, 32-35
25R-2, 32-35
25R-2, 35-38
25R-2, 4 1 ^ 4
25R-2, 61-64
25R-2, 61-64
25R-2, 65-67
25R-2, 108-110
25R-2, 115-116
25R-2, 133-135
25R-3, 10-15
26R-1, 100-104
26R-1, 104-106
26R-2, 62-69
26R-2, 67-69
26R-3, 37-40
26R-3, 46-48
27R-1,56-59
27R-1, 59-63
27R-2, 105-109
27R-2, 105-109
27R-2, 105-106
27R-2, 114-121
27R-2, 114-117
27R-2, 121-124
27R-2, 124-130
27R-2, 130-136
27R-2, 136-142
27R-2, 136-142
29R-1, 128-134
30R-l,6-13
30R-1, 50-55
30R-1, 110-112
1A
6A
6A
8
325.70
344.05
344.05
345.91
345.95
346.57
346.58
346.59
347.27
347.51
347.52
347.59
348.55
348.58
348.60
353.73
353.97
354.02
354.03
354.90
355.10
356.04
356.08
356.68
357.15
357.15
363.87
363.93
363.98
363.98
364.13
385.33
385.33
385.34
411.30
412.19
412.19
412.19
412.33
412.50
413.12
413.12
413.15
413.21
413.41
413.41
413.45
413.88
413.95
414.13
414.36
422.00
422.04
423.12
423.17
424.23
424.32
431.06
431.09
433.00
433.00
433.00
433.09
433.09
433.16
433.19
433.25
433.31
433.31
450.98
459.36
459.80
460.40
Fisk
McNeill
Teagle
Fisk
Teagle
Fisk
McNeill
Fisk
Fisk
Fisk
McNeill
Fisk
Fisk
McNeill
Fisk
Fisk
Fisk
McNeill
Fisk
Fisk
McNeill
Fisk
McNeill
Fisk
Fisk
McNeill
McNeill
Fisk
Fisk
McNeill
Fisk
Fisk
McNeill
Fisk
Fisk
Fisk
McNeill
Teagle
Fisk
Bach
Fisk
McNeill
Fisk
Fisk
Fisk
McNeill
Fisk
Fisk
Fisk
Fisk
McNeill
Fisk
Fisk
Fisk
McNeill
Fisk
McNeill
Fisk
Fisk
Fisk
McNeill
McNeill
Fisk
Fumes
Teagle
McNeill
Fisk
Fisk
McNeill
Fisk
Fisk
McNeill
Fisk
3
4
32
3
9
3
4
3
3
2
4
3
3
4
1
1
2
8
13
13
14
4B
4B
5
6
9A
9A
9B
5
10
1
2
12
19
19
9
11
12
12
14
IB
17
17
1
11
11
11
13
15
4
4
5
8
11
11
12
19
21
23
2
14
15
12
12
5
6
6
7
13
13
13
14
14
15
15
16
17
17
19
2
8
1C
3
4
4
2
4
3
4
3
4
4
4
3
3
4
3
3
4
3
4
20
3
10
3
4
3
3
3
4
3
3
3
3
4
2
3
3
4
4
3
2
3
4
4
3
10
18
4
3
3
4
3
3
4
3
SiO2
49.99
50.45
51.72
50.94
51.64
50.82
50.35
51.09
51.04
50.93
50.47
50.84
50.66
50.49
50.83
51.17
50.86
50.50
51.18
47.69
51.50
50.64
50.84
51.16
51.29
50.87
51.10
51.54
51.22
50.76
51.25
51.38
51.20
50.98
51.09
49.16
48.96
50.30
49.80
49.40
50.01
48.85
49.69
49.64
49.64
49.24
49.39
49.21
49.37
49.44
49.22
48.99
49.37
48.82
49.25
48.94
49.15
49.37
49.03
49.13
49.28
50.08
49.03
50.94
50.12
49.03
49.70
49.87
49.30
50.98
51.16
50.67
50.39
TiO 2
0.83
0.99
0.95
0.96
0.92
0.95
0.97
0.97
1.00
0.96
0.99
0.95
0.99
0.94
0.99
0.97
0.95
0.95
0.97
0.26
0.99
0.99
1.01
0.98
1.01
1.03
0.98
1.03
0.97
0.96
1.00
0.99
0.94
1.01
1.00
0.85
0.87
0.86
0.88
0.89
0.89
0.87
0.87
0.88
0.89
0.85
0.90
0.86
0.89
0.90
0.88
0.92
0.90
0.90
0.81
0.90
0.89
0.91
0.92
0.68
0.67
0.67
0.65
0.67
0.63
0.64
0.66
0.68
0.67
0.95
0.95
0.90
0.95
A1 2 O 3
FeO*
MgO
CaO
Na2O
K2O
MnO
P2O5
Cr 2 O 3
15.46
14.85
14.88
14.62
14.82
14.56
14.85
14.73
14.68
14.69
14.75
14.69
14.64
14.78
14.68
14.76
14.76
15.02
14.73
18.59
14.64
14.66
14.65
14.52
14.54
14.75
14.79
14.62
14.42
14.68
14.65
14.69
14.87
14.68
14.47
16.31
16.53
16.54
16.19
15.77
16.35
16.54
16.42
16.35
16.45
16.55
16.39
16.34
16.29
16.44
16.64
16.25
16.35
16.23
16.65
16.32
16.63
16.19
16.12
15.71
16.17
15.98
15.72
15.50
16.06
16.07
15.93
15.98
16.26
14.93
14.79
14.97
9.50
10.03
9.73
9.71
9.46
9.78
9.89
9.99
9.87
9.87
9.99
9.70
9.59
9.88
9.77
9.85
9.80
9.77
9.85
11.09
9.86
9.20
9.63
9.70
9.78
10.16
10.29
9.82
9.32
10.36
9.79
9.81
10.06
9.68
9.55
8.66
8.99
8.74
8.63
8.60
8.71
9.23
8.50
8.70
8.41
9.17
8.75
8.71
8.79
8.72
9.11
8.23
8.07
8.44
13.22
12.93
12.59
12.96
12.50
13.00
13.00
13.11
12.88
12.98
12.95
13.10
12.98
13.02
13.08
13.08
12.70
12.99
12.88
0.68
13.04
12.63
12.95
12.77
12.71
13.02
12.99
12.69
12.91
12.89
12.87
12.90
13.05
12.92
12.92
12.81
12.89
12.40
13.03
12.65
13.22
12.96
13.06
13.12
12.75
12.81
13.17
12.92
13.03
12.90
12.78
12.97
12.96
12.89
12.92
13.04
12.84
12.54
12.54
13.19
13.64
13.39
13.01
13.60
13.12
13.66
13.55
13.50
13.61
13.31
13.21
13.33
13.22
1.86
1.88
1.88
1.92
1.92
1.88
1.87
1.85
1.92
1.90
1.86
1.88
0.02
0.02
0.02
0.02
0.01
0.02
0.02
0.02
0.01
0.02
0.02
0.02
0.02
0.02
0.03
0.01
0.02
0.02
0.02
0.15
0.10
0.16
0.23
0.07
0.05
0.07
0.06
0.06
0.08
0.03
0.03
0.08
0.05
0.06
0.07
0.06
0.07
0.04
0.08
0.05
0.05
0.04
0.10
0.04
0.03
0.06
0.05
0.05
0.06
0.05
0.09
0.05
0.03
0.04
0.07
0.05
0.06
0.04
0.05
0.03
0.05
0.04
0.04
0.06
0.02
0.03
0.06
0.04
0.05
0.07
0.04
0.04
0.05
0.04
0.01
0.04
0.03
0.04
0.06
0.04
0.05
0.02
0.07
0.03
0.02
0.04
0.08
0.07
0.06
0.09
0.04
0.09
0.04
0.06
0.06
0.06
0.07
0.07
0.05
0.07
0.04
0.08
0.06
0.07
0.07
0.07
0.06
0.04
0.07
0.05
0.04
0.07
0.06
0.05
0.06
0.06
0.04
0.05
0.08
0.06
0.04
0.06
0.07
0.06
0.04
0.04
0.06
0.07
0.08
0.07
0.05
0.04
0.04
0.04
0.06
0.07
0.11
0.06
0.05
0.05
0.03
0.05
0.06
0.08
0.08
0.05
0.07
0.05
0.04
0.03
0.04
0.04
0.04
0.06
0.06
0.06
0.07
0.08
0.07
0.05
0.08
0.08
0.07
0.05
0.07
0.07
14.51
9.14
8.94
8.75
8.67
9.14
8.50
9.03
8.65
8.76
8.92
9.26
8.91
8.59
8.60
8.93
9.12
8.88
9.16
9.20
9.64
9.37
9.77
9.54
8.13
8.39
8.22
8.46
8.51
8.38
8.18
8.44
8.43
8.19
8.59
8.53
8.40
8.21
8.47
12.70
8.01
8.15
8.14
8.23
8.43
8.22
8.16
8.35
8.53
8.01
8.44
8.33
8.16
8.38
8.36
9.31
9.09
8.96
9.36
9.12
9.29
9.15
9.32
9.33
9.18
9.09
9.18
9.17
9.28
9.18
9.08
9.24
9.16
9.33
9.09
9.27
9.03
9.27
9.13
9.65
9.45
9.18
9.63
9.25
9.26
9.43
9.56
9.65
9.50
8.62
8.53
8.25
8.41
.89
.84
.93
.88
.84
1.86
1.90
1.56
1.83
1.80
1.83
1.87
1.83
1.83
1.82
1.84
1.89
1.81
1.84
1.83
1.88
1.80
1.82
2.12
2.14
2.18
2.20
2.15
2.20
2.17
2.15
2.17
2.33
2.16
2.20
2.14
2.18
2.13
2.16
2.13
2.18
2.17
2.15
2.18
2.17
2.15
2.10
1.63
1.62
1.61
1.61
1.63
1.63
1.62
1.67
1.64
1.64
2.00
2.03
1.93
1.99
0.18
0.02
0.01
0.02
0.02
0.02
0.01
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.01
0.02
0.02
0.02
0.01
0.01
0.01
0.02
0.01
0.06
0.02
0.01
0.02
0.03
0.02
0.02
0.03
0.01
0.02
0.01
0.02
0.01
0.02
0.02
0.01
0.02
0.02
0.03
0.01
0.01
0.02
0.03
0.02
0.02
0.01
0.01
0.02
0.03
0.18
0.18
0.16
0.19
0.17
0.17
0.11
0.18
0.13
0.14
0.15
0.13
0.12
0.15
0.15
0.19
0.14
0.15
0.14
0.15
0.13
0.11
0.14
0.15
0.13
0.15
0.14
0.13
0.13
0.13
0.14
0.12
0.16
0.13
0.12
0.16
0.12
0.12
0.12
0.10
0.15
0.15
0.13
0.13
0.16
0.11
0.11
0.17
0.13
0.12
0.15
0.14
0.13
0.13
0.12
0.11
0.13
0.14
0.12
0.15
0.18
0.12
0.12
0.12
0.12
0.15
0.12
0.15
0.12
Total
100.28
99.60
100.14
99.94
99.69
99.74
99.40
100.50
100.21
99.99
99.45
99.93
99.44
99.44
100.11
100.53
99.55
99.59
100.25
93.12
100.12
98.31
99.34
99.50
99.83
100.13
100.40
100.21
99.51
99.73
100.06
100.21
100.44
99.72
99.46
99.46
99.75
100.24
100.32
98.90
100.91
99.98
100.24
100.42
99.96
100.14
100.23
99.58
100.11
99.94
100.14
99.77
99.91
99.24
100.26
99.40
99.97
99.35
98.84
99.18
100.32
100.07
98.49
100.34
100.06
99.81
100.18
100.73
100.44
100.72
100.29
100.12
99.29
Note: N = number of analyses.
possible that this results from inhomogeneity of the glass standard
VGBS.
The complete data set, except for P and Mn, is presented as a function of depth (Fig. 1). This figure shows the similarities and differences of analyses from the same samples analyzed by different
microprobes. All laboratories show a consistent increase in TiO2,
FeO*, and Na2O, and a decrease in A12O3 and MgO with depth. Interpretation of the glass chemistry is presented in other publications in
this volume.
486
CONCLUSIONS
Glasses from Hole 896A were analyzed for major elements by
electron microprobes in six different laboratories. Analyses of identical samples by different laboratories show that there are interlaboratory differences for some elements, notably MgO. Other elements
(TiO2, for example) are remarkably similar. The complete data set
can be obtained from the authors over Internet.
DATA REPORT
ACKNOWLEDGMENTS
We wish to thank Gene Jarosewich and Joe Nelen of the Smithsonian, and Roger Nielsen of Oregon State University for help with
microprobe analyses. Thanks to John Bender and Michael Perfit for
helpful reviews.
REFERENCES
Colby, J.B., 1968. MAGIC IV—computer program for quantitative electron
microprobe analysis. Adv. X-Rαy Anal., 11:287-306,
Jarosewich, E., Nelen, J.A., and Norberg, J.A., 1980. Reference samples for
electron microprobe analysis. Geostand. NewsL, 4:43-47.
Date of initial receipt: 19 August 1994
Date of acceptance: 2 January 1995
Ms 148SR-105
9
10
FeO* (wt%) Others
13
CaO (wt%) Others
Figure 2. Comparison of microprobe analyses of MgO, SiO2, FeO*, and
CaO from the five laboratories. Analyses from the Oregon State University
microprobe are plotted vs. analyses of glass from the same piece by other
laboratories.