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Table 1. Composition of starting materials.


152-917A-27R-2
(Piece 4, 38-43 cm)
152-918D-108R-1
(Piece 2B, 54-58 cm)
163-989B-10R-7
(Piece 5A, 55-59 cm)



XRF*
XRF
Probe


XRF*
XRF
Probe


XRF*
XRF
Probe

SiO2
51.98
54.28
54.58


50.29
51.29
50.50


49.99
50.93
48.48

TiO2
1.21
1.26
1.25


0.94
0.95
0.99


1.03
1.05
1.11

Al2O3
14.82
15.48
15.82


13.56
13.77
13.94


13.41
13.66
13.95

Fe2O3
10.27




3.61




6.11


FeO
1.54




8.81




7.01


FeO**
10.78
11.26
12.53


12.06
12.24
13.22


12.51
12.74
13.57

MnO
0.12
0.13
0.15


0.23
0.23
0.25


0.20
0.20
0.21

MgO
5.36
5.60
5.56


7.84
7.96
7.54


8.03
8.18
0.04

CaO
7.27
7.59
7.60


11.39
11.56
11.43


10.67
10.87
11.06

Na2O
3.28
3.43
3.34


2.01
2.04
1.84


2.11
2.15
0.24

K2O
0.80
0.84
0.77


0.08
0.08
0.14


0.12
0.12
0.13

P2O
50.12
0.13
0.08


0.09
0.09
0.06


0.10
0.10
0.03

LOI
2.84
1.31
1.33










Total
99.61
100.00
101.68


100.15
100.00
99.91


100.11
100.00
98.82

























Mg#
0.470

0.442


0.537

0.504


0.534

0.514
















V
239




323




355


Cr
ND




114




58


Ni
52




101




81


Cu
78




221




186


Zn
143




81




102


Sr
501




72




78

















CIPW weight norm

























Or
4.96

4.47


0.48

0.83


0.72

0.78

Ab
29.02

27.46


17.27

15.58


18.19

19.15

An
24.35

25.46


28.16

29.38


27.25

27.90

Hy
27.57

29.81


25.38

26.85


25.34

12.41

Di
10.41

9.32


23.74

22.48


21.57

22.02

Ol
0.00

0.00


2.95

2.86


4.70

15.19

Il
2.39

2.33


1.81

1.88


1.99

2.13

Ap
0.31

0.19


0.22

0.14


0.24

0.38

Cm













0.04

Notes: * = from Larsen et al. (1998) and Larsen et al. (this volume) as determined by XRF. = XRF analysis calculated anhydrous with all iron as FeO. = Electron microprobe analy-sis of superliquidus glass. FeO** = total iron as FeO. Mg# = Mg/(Mg+Fe) ratio with all iron as Fe2+. LOI = loss on ignition. ND = no data. = CIPW weight norm calculated with all iron as FeO.

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