Table T1. Instrumental conditions and analytical precision for Leg 191 XRF analyses.

Element Line Anode Filter Crystal Detector Colimator Peak angle (°2)   Background angle (°2)   Count time (s)   Lower
limit of detection		 Accuracy of calibration line Analytical
precision
(1)
Positive
Negative
Peak
Background
SiO2 K Rh Out PET FPC Standard 109.040
111.850 106.200
20 4
0.0082 0.186 0.140
TiO2 K Rh Out LiF(200) FPC Standard 86.126
87.980 84.460
20 10
0.0008 0.012 0.003
Al2O3 K Rh Out PET FPC Standard 144.730
147.550 140.600
20 10
0.0036 0.065 0.041
Fe2O3* K Rh Out LiF(200) Sc Standard 57.523
58.880 56.000
10 4
0.0008 0.092 0.031
MnO K Rh Out LiF(200) Sc Standard 62.969
63.720 61.580
20 10
0.0006 0.001 0.001
MgO K Rh Out TAP FPC Standard 45.220
46.950

40 20
0.0060 0.055 0.039
CaO K Rh Out LiF(200) FPC Standard 113.067
115.250 110.550
10 4
0.0012 0.024 0.035
Na2O K Rh Out TAP FPC Standard 55.171
56.800

60 20
0.0068 0.038 0.038
K2O K Rh Out LiF(200) FPC Standard 136.603
139.200 133.700
10 4
0.0006 0.026 0.006
P2O5 K Rh Out Ge FPC Standard 141.070
143.250 138.100
40 20
0.0008 0.004 0.002
Sc K W Out LiF(200) FPC Standard 97.730

97.100
150 150
0.87 0.91 1.23
V K W Out LiF(200) Sc Fine 76.915

75.960
90 30
2.34 2.65 2.39
Cr K W Out LiF(200) Sc Fine 69.335
70.370 68.640
40 20
1.76 1.99 1.53
Ni K W Out LiF(200) Sc Fine 48.660
49.700 48.100
15 10
0.97 1.86 0.72
Cu K Rh Fe LiF(200) Sc Standard 45.010
45.510 44.500
20 20
1.40 3.64 2.36
Zn K W Out LiF(200) Sc Fine 41.790
42.100

20 15
0.91 2.01 1.43
Ga K Rh Fe LiF(200) Sc Standard 38.900
39.440

30 30
0.81 0.60 1.19
Rb K Rh Cu LiF(200) Sc Standard 26.600
27.120 25.760
20 20
0.65 1.64 0.68
Sr K Rh Fe LiF(200) Sc Standard 25.140
25.720 24.590
10 10
1.04 3.18 2.46
Y K Rh Fe LiF(200) Sc Standard 23.770
24.480 23.020
20 20
0.77 0.84 0.71
Zr K Rh Fe LiF(200) Sc Fine 22.540
23.020

10 10
1.13 1.66 1.74
Nb K Rh Fe LiF(200) Sc Fine 21.390
21.730

15 15
0.93 1.54 0.72
Cs L Rh Out LiF(200) FPC Fine 91.840
93.000 90.000
400 400
1.25 0.85 0.50
Ba L W Out LiF(200) Sc Standard 87.135
88.160

200 200
3.01 9.15 8.55
La L W Out LiF(200) Sc Standard 82.890
83.960 82.120
600 600
1.54 1.09 0.90
Ce L1 W Out LiF(200) Sc Fine 71.640
72.700 70.900
500 500
1.70 1.83 0.79
Nd L W Out LiF(200) Sc Standard 72.120
72.700

500 500
0.96 0.64 0.62
Sm L W Out LiF(200) Sc Standard 66.210
67.050 65.650
500 500
0.65 0.76 0.62
Gd L W Out LiF(200) Sc Fine 61.080
61.320 60.510
500 500
0.69 0.50 0.29
Dy L1 W Ti LiF(200) Sc Fine 50.290
50.470 50.050
600 600
1.04 0.55 0.89
Er L1 W Ti LiF(200) Sc Fine 46.440
46.770 46.100
600 600
1.10 0.47 0.37
Yb L Rh Ti LiF(200) Sc Fine 49.055
49.760 47.920
600 600
0.64 0.66 0.44
Hf L Rh Ti LiF(200) Sc Standard 45.880
46.150

500 500
0.49 0.39 0.63
Pb L1 Rh Cu LiF(200) Sc Standard 28.250
28.640 27.980
150 150
0.61 0.76 0.42
Th L Rh Cu LiF(200) Sc Fine 27.460
28.000 27.200
100 100
0.55 0.81 0.65

Note: * = Total Fe as Fe2O3. FPC = gas flow proportional counter using PR gas. Sc = naI scintillation counter. All elements were analyzed at generator settings of 50 kV and 50 mA. The lower limit of detection, accuracy of calibration, and analytical precision are shown in weight percent for major elements and in parts per million for trace elements. Analytical precision is shown as standard deviations of 10 repeated analyses of the Geological Survey of Japan reference standard JG-2 for rare earth elements and JB-1a for the others.